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Effects Of Cover Crops And Phosphorus Fertilizer Management On Soil Health Parameters In A No-Till Corn-Soybean Cropping System In Riley County, Kansas, L. M. Starr, P. J. Tomlinson, N. O. Nelson, K. L. Roozeboom, G. J. Kluitenberg, D. R. Presley Aug 2019

Effects Of Cover Crops And Phosphorus Fertilizer Management On Soil Health Parameters In A No-Till Corn-Soybean Cropping System In Riley County, Kansas, L. M. Starr, P. J. Tomlinson, N. O. Nelson, K. L. Roozeboom, G. J. Kluitenberg, D. R. Presley

Kansas Agricultural Experiment Station Research Reports

This study was implemented to examine the effects of cover crops and mineral phos­phorus (P) fertilizer application on water quality and soil health parameters. The experiment was established in 2014, at the Kansas Agricultural Watershed (KAW) field research facility, Ashland Bottoms Research Farm, Kansas State University, Manhattan, KS. The experiment was a 2 × 3 factorial design with two cover crop treatments (with and without) and three phosphorus fertilizer treatments (none, spring injected P, and fall broadcast P). Measures of nutrient demand (enzyme activity), microbial metabolic activity (soil respiration), and labile carbon (potassium permanganate oxidized carbon) were taken to assess ...


Evaluation Of Two Implants For Steers On Early-Intensively Grazed Tallgrass Native Range, J. K. Farney, M. E. Corrigan Feb 2019

Evaluation Of Two Implants For Steers On Early-Intensively Grazed Tallgrass Native Range, J. K. Farney, M. E. Corrigan

Kansas Agricultural Experiment Station Research Reports

Objective: To evaluate the effect of two implants that have different lengths of effective use on stocker cattle gains within an intensive early double-stocked native tallgrass prairie grazing system.

Study Description: Stocker steers (n = 281) were implanted with Revalor-G (Merck Animal Health, Madison, NJ) or Synovex One Grass (Zoetis, Inc., Kalamazoo, MI) and grazed on tallgrass native range for 90 days during the summer. The steers were individually weighed, after an overnight shrink, on the day of implanting, at midpoint of grazing, and the end of the grazing period. Total gains and average daily gain were evaluated.

The Bottom Line ...


Nitrogen Fertilizer Timing And Phosphorus And Potassium Fertilization Rates For Established Endophyte-Free Tall Fescue, D. W. Sweeney, J. K. Farney, J. L. Moyer Jan 2019

Nitrogen Fertilizer Timing And Phosphorus And Potassium Fertilization Rates For Established Endophyte-Free Tall Fescue, D. W. Sweeney, J. K. Farney, J. L. Moyer

Kansas Agricultural Experiment Station Research Reports

A tall fescue production study was conducted at two locations, beginning in the fall of 2016 and the fall of 2017. At both sites, phosphorus (P) fertilization rate only affected the spring harvest, with few differences in yield. Applying nitrogen (N) in late fall or late winter resulted in greater spring yields than applying N in spring or not applying N. However, at Site 1 in 2017 fall harvest yields were greater from the spring N applica­tion, but this response was less at Site 2 in 2018. In both years, applying N increased tall fescue yield, but at Site ...


Effects Of Interseeding Ladino Clover Into Tall Fescue Pastures Of Varying Endophyte Status On Grazing And Subsequent Finishing Performance Of Stocker Steers, L. W. Lomas, J. L. Moyer Jan 2019

Effects Of Interseeding Ladino Clover Into Tall Fescue Pastures Of Varying Endophyte Status On Grazing And Subsequent Finishing Performance Of Stocker Steers, L. W. Lomas, J. L. Moyer

Kansas Agricultural Experiment Station Research Reports

One hundred ninety-two yearling steers grazing tall fescue pastures were used to evalu­ate the effects of fescue cultivar and interseeding ladino clover on available forage, grazing gains, and subsequent finishing performance in 2016, 2017, and 2018. Fescue cultivars evaluated were high-endophyte ‘Kentucky 31,’ low-endophyte Kentucky 31, ‘HM4,’ and ‘MaxQ.’ In 2016 and 2018, steers that grazed pastures of low-endophyte Kentucky 31, HM4, or MaxQ gained significantly more (P < 0.05) and produced more (P < 0.05) gain/a than those that grazed high-endophyte Kentucky 31 pastures. Gains of cattle that grazed low-endophyte Kentucky 31, HM4, or MaxQ were similar (P > 0.05). In 2017, steer gains were similar (P > 0.05) among all cultivars. High-endo­phyte Kentucky 31 pastures had more (P < 0.05) available forage than low-endophyte Kentucky 31, HM4, or MaxQ pastures during both 2016 and 2017. Steer gains and gain/acre were similar (P > 0.05) between pastures fertilized with nitrogen (N) in ...


High And Low Management Input Regimes Result In Similar Net Carbon Sequestration Rates In Zoysiagrass Golf Course Fairway Turf, Ross C. Braun, Dale J. Bremer Jan 2019

High And Low Management Input Regimes Result In Similar Net Carbon Sequestration Rates In Zoysiagrass Golf Course Fairway Turf, Ross C. Braun, Dale J. Bremer

Kansas Agricultural Experiment Station Research Reports

This study was conducted from 2013–2016 to determine how irrigation and N fertilization may be managed to enhance carbon (C) sequestration in turf. In this study, the annual rate of change in soil organic carbon (ΔSOC) was measured under two management regimes, a high management input regime (HMI) and low man­agement input regime (LMI), in a ‘Meyer’ zoysiagrass (Zoysia japonica Steud.) golf course fairway.

Both management regimes maintained acceptable turf quality and at least 75% green cover during both summers. In both management regimes, soil organic carbon (SOC) increased after the 3.16-yr (1154-d) period indicating that C ...


Consumer Evaluation Of The Degree Of Doneness Of Beef Strip Loin Steaks Cooked To Six End-Point Temperatures, L. L. Prill, L. N. Drey, J. L. Vipham, M. D. Chao, J. M. Gonzalez, T. A. Houser, E. A. Boyle, T. G. O'Quinn Jan 2019

Consumer Evaluation Of The Degree Of Doneness Of Beef Strip Loin Steaks Cooked To Six End-Point Temperatures, L. L. Prill, L. N. Drey, J. L. Vipham, M. D. Chao, J. M. Gonzalez, T. A. Houser, E. A. Boyle, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to assess consumers’ degree of doneness practices in addition to their ability to identify beef steak degrees of doneness.

Study Description: Beef strip loins (n = 24) from 12 animals representing five quality treatments [Prime, Top Choice, Low Choice, Select, and Select Enhanced (108%)] were collected. Steaks were cooked to an end-point temperature of very-rare (130°F), rare (140°F), medium-rare (145°F), medium (160°F), well-done (170°F), or very well-done (180°F). Cooked steaks were cut in half, perpendicular to the long axis of the steak, and photographs were taken immediately on ...


Minimal Water Requirements Of Cool-Season Turfgrasses For Survival And Recovery After Prolonged Drought, Mu Hong, Dale Bremer, Steve Keeley Jan 2019

Minimal Water Requirements Of Cool-Season Turfgrasses For Survival And Recovery After Prolonged Drought, Mu Hong, Dale Bremer, Steve Keeley

Kansas Agricultural Experiment Station Research Reports

Sodded tall fescue (TF) and Kentucky bluegrass (KBG) turfgrasses were exposed to prolonged drought at several levels of deficit irrigation from 0% to 50% of reference evapotranspiration (ET) within the first year of establishment. Tall fescue watered at 40% and 50% ET maintained minimally acceptable performance longer during the dry-down phases and recovered faster after rewatering than lower ET treatments. Tall fescue with no water input (0% ET) maintained minimally acceptable performance for about 5 weeks, which was longer than KBG watered at 50% ET, which remained acceptable for less than 3 weeks during the dry down. Although KBG watered ...


Influence Of Herbicide Combinations And Sequential Applications On Windmillgrass (Chloris Verticillata) Control, Nicholas Mitchell, Jared Hoyle Jan 2019

Influence Of Herbicide Combinations And Sequential Applications On Windmillgrass (Chloris Verticillata) Control, Nicholas Mitchell, Jared Hoyle

Kansas Agricultural Experiment Station Research Reports

Windmillgrass (Chloris verticillata Nutt.) populations commonly infest turfgrass systems in the midwest, which result in aesthetically unacceptable turfgrass stands. Pylex (topramezone) and Acclaim Extra (fenoxaprop) have resulted in fair control of windmillgrass with single applications. For adequate control of windmillgrass, a sequential application of Tenacity (mesotrione), three weeks after the initial application, is recommended. Additionally, studies have shown the addition of triclopyr to HPPD inhibitor herbicides increases windmillgrass control in a controlled environ­ment. Field experiments were initiated in 2018, at the Kansas State University Rocky Ford Turfgrass Research Center in Manhattan, KS, to determine the influence of herbicide combinations ...


Intensive Wheat Management For Yield And Quality: The Role Of Variety, Environment, And Management Practices, R. P. Lollato, B. R. Jaenisch, D. Marburger Jan 2019

Intensive Wheat Management For Yield And Quality: The Role Of Variety, Environment, And Management Practices, R. P. Lollato, B. R. Jaenisch, D. Marburger

Kansas Agricultural Experiment Station Research Reports

Management (M), variety (V), and environment (E) greatly influence wheat yield and quality. With the objective of determining the partial influence of V, E, and M, we conducted a field experiment where we imposed four management intensities to five wheat varieties during six site-years in Kansas and Oklahoma. Management intensities were 1) low-input (N fertility for a yield goal of 60 bu/a); 2) high-input (foliar fungi­cide, sulfur and chloride fertilizers, growth regulator, and nitrogen (N) fertility for a yield goal of 100 bu/a); 3) high-input minus fungicide; and 4) high-input minus addi­tional N. We selected commonly ...


Changes In Soil Microbiology Under Conventional And No-Till Production During Crop Rotation, C. J. Hsiao, G. F. Sassenrath, L. Zeglin, G. Hettiarachchi, C. Rice Jan 2019

Changes In Soil Microbiology Under Conventional And No-Till Production During Crop Rotation, C. J. Hsiao, G. F. Sassenrath, L. Zeglin, G. Hettiarachchi, C. Rice

Kansas Agricultural Experiment Station Research Reports

Soil microbial activity is important for crop production. Soil microbes are involved in nutrient and water cycling within the soil, and interact with crop plants to provide the basic nutrient and water resources needed for crop production. Claypan soils have unique physical characteristics that impact soil biology. This study explored the tempo­ral changes in soil microbiology in a claypan soil under conventional and no-till produc­tion during a crop rotation of corn/winter wheat/soybean/fallow commonly planted in southeast Kansas. We found soil microbial activity changed more in the top two inches of soil than in the lower ...


Long-Term Nitrogen And Phosphorus Fertilization Of Irrigated Corn, A. J. Schlegel, H. D. Bond Jan 2019

Long-Term Nitrogen And Phosphorus Fertilization Of Irrigated Corn, A. J. Schlegel, H. D. Bond

Kansas Agricultural Experiment Station Research Reports

Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated corn in western Kansas. In 2018, N applied alone increased yields by 76 bu/a, whereas P applied alone increased yields up to 17 bu/a. Nitrogen and P applied together increased yields up to 169 bu/a which is 26 bu/a more than the 10-year average of 143 bu/a. Application of 120 lb/a N (with highest P rate) produced 97% of maximum yield in 2018, which is slightly greater than the 10-year average. Application of 80 instead of ...


Effect Of Late Nitrogen Fertilization On Grain Yield And Grain Filling In Corn, J. A. Fernandez, I. A. Ciampitti Jan 2019

Effect Of Late Nitrogen Fertilization On Grain Yield And Grain Filling In Corn, J. A. Fernandez, I. A. Ciampitti

Kansas Agricultural Experiment Station Research Reports

For decades, yield improvement in corn has been accompanied by an increase in plant nitrogen (N) uptake. Modern hybrids are absorbing more N during reproductive stages, while delaying N remobilization to the grain for later in the growing season. To evaluate the effect of late-season N applications in distinct corn genotypes, grain yield and grain filling parameters were evaluated in field experiments under early and late N regimes during 2017 and 2018 growing seasons. Hybrids with different release years (3394, 1990s; P1151, 2000s; and P1197, 2016) and contrasting N application scenarios (including a zero-N control) were evaluated at the Kansas ...


Quality Grade Has No Effect On Top Sirloin Steaks Cooked To Multiple Degrees Of Doneness, B. A. Olson, E. A. Rice, J. M. Gonzalez, J. L. Vipham, M. D. Chao, T. A. Houser, E. A. Boyle, T. G. O'Quinn Jan 2019

Quality Grade Has No Effect On Top Sirloin Steaks Cooked To Multiple Degrees Of Doneness, B. A. Olson, E. A. Rice, J. M. Gonzalez, J. L. Vipham, M. D. Chao, T. A. Houser, E. A. Boyle, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective: The objective of this study was to evaluate the effect of cooking top sirloin steaks from four quality grades to multiple degrees of doneness (rare, medium, well-done) on beef palatability traits.

Study Description: Beef top sirloin butts (n = 60; 15/quality grade) from four U.S. Department of Agriculture quality grades [Prime, Top Choice (Modest and Moderate marbling), Low Choice, and Select] were selected from a Midwest beef processor. Top butts were transported to the Kansas State University Meat Laboratory, fabricated into 1-in steaks, vacuum packaged, and aged for 28 days at 39.2°F. Following aging, steaks were ...


Effects Of Various Grazing Systems On Grazing And Subsequent Finishing Performance, L. W. Lomas, J. L. Moyer Jan 2019

Effects Of Various Grazing Systems On Grazing And Subsequent Finishing Performance, L. W. Lomas, J. L. Moyer

Kansas Agricultural Experiment Station Research Reports

A total of 360 mixed black yearling steers were used to compare grazing and subsequent finishing performance from pastures with ‘MaxQ’ tall fescue, a wheat-bermudagrass double-crop system, or a wheat-crabgrass double-crop system in 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, and 2018. Daily gains of steers that grazed MaxQ fescue, wheat-bermudagrass, or wheat-crabgrass were similar (P > 0.05) in 2010, 2016, 2017, and 2018. Daily gains of steers that grazed wheat-bermudagrass or wheat-crabgrass were greater (P > 0.05) than those that grazed MaxQ fescue in 2011 and 2012. Daily gains of steers that grazed wheat-crabgrass were greater (P > 0 ...


Alternative Cropping Systems With Limited Irrigation, A. Schlegel, D. Bond Jan 2019

Alternative Cropping Systems With Limited Irrigation, A. Schlegel, D. Bond

Kansas Agricultural Experiment Station Research Reports

A limited irrigation study involving four cropping systems and evaluating four crop rotations was initiated at the Southwest Research-Extension Center near Tribune, KS, in 2012. The cropping systems were two annual systems (continuous corn [C-C] and continuous grain sorghum [GS-GS]) and two 2-year systems (corn- grain sorghum [C-GS] and corn-winter wheat [C-W]). In 2018, corn yields were similar for all rotations, although averaged across the past 6 years, corn yields were greater following wheat than following corn. There were no significant differences in grain sorghum yields in 2018, which was similar to the multi-year average. Wheat yields were near the ...


Tillage Intensity In A Long-Term Wheat-Sorghum-Fallow Rotation, A. Schlegel, A. Burnett Jan 2019

Tillage Intensity In A Long-Term Wheat-Sorghum-Fallow Rotation, A. Schlegel, A. Burnett

Kansas Agricultural Experiment Station Research Reports

This study was initiated in 1991 at the Kansas State University Southwest Research-Extension Center near Tribune, KS. The purpose of the study was to identify the effects of tillage intensity on precipitation capture, soil water storage, and grain yield in a wheat-sorghum-fallow rotation. Grain yields of wheat and grain sorghum increased with decreased tillage intensity in a wheat-sorghum-fallow (WSF) rotation. In 2018, available soil water at sorghum planting was greater for no-tillage (NT) than reduced tillage (RT) which was greater than conventional tillage (CT). For wheat there was a similar pattern as sorghum, with available soil water at wheat planting ...


Seeding Rate For Dryland Wheat, A. Schlegel, J. Holman, L. Haag Jan 2019

Seeding Rate For Dryland Wheat, A. Schlegel, J. Holman, L. Haag

Kansas Agricultural Experiment Station Research Reports

Four winter wheat varieties (PlainsGold Byrd, Limagrain T158, Syngenta TAM 111, and WestBred Winterhawk) were planted at five seeding rates (30, 45, 60, 75, and 90 lb/a) in the fall of 2014, 2015, 2016, and 2017 at Colby, Garden City, and Tribune, KS. The objective of the study is to identify appropriate seeding rates for dryland winter wheat in western Kansas. Averaged across varieties, a seeding rate of 60 lb/a seemed to be adequate at all locations in 2015. However, with higher yields in 2016, a higher seeding rate (75 lb/a) was beneficial. Although yields were less ...


Liberty Compared To Glyphosate Products In Irrigated Corn, R. S. Currie, P. W. Geier Jan 2019

Liberty Compared To Glyphosate Products In Irrigated Corn, R. S. Currie, P. W. Geier

Kansas Agricultural Experiment Station Research Reports

Postemergence treatments of Liberty (glufosinate) were compared to Durango DMA and Roundup PowerMax (glyphosate) after various preemergence treatments for efficacy in corn. Control of common sunflower, green foxtail, Russian thistle, and quinoa exceeded 92% regardless of herbicide treatment or evaluation date. Similarly, all preemergence (PRE) treatments controlled Palmer amaranth, kochia, and crabgrass by 93% or more. Later in the season, control of kochia was slightly less when Verdict (saflufenacil/dimethenamid) and atrazine PRE was followed by Roundup PowerMax and atrazine postemergence (POST). Palmer amaranth and crabgrass control was less when Verdict and atrazine PRE was followed by Roundup PowerMax or ...


Evaluating Single And Multi-Species Summer Cover Crops For Biomass Yield, J. K. Farney, G. F. Sassenrath Jan 2019

Evaluating Single And Multi-Species Summer Cover Crops For Biomass Yield, J. K. Farney, G. F. Sassenrath

Kansas Agricultural Experiment Station Research Reports

Cover crops have multiple benefits to integrated agricultural production systems. How­ever, information is needed on best species and mixes to use. In this one-year study, the single species grass cover crops produced the most biomass. Spring forage peas did not perform well as a summer cover crop, yielding the same biomass as the fallow areas. Adding collards to the mixtures generally reduced total biomass production compared to single species of grasses alone. Total biomass production was affected by the number of plants in the mixture. Yields of grass-only plots were ~868 lb of dry matter (DM) per acre more ...


Controlling Soil-Borne Disease In Soybean With A Mustard Cover Crop, G. F. Sassenrath, C. Little, K. Roozeboom, X. Lin, D. Jardine Jan 2019

Controlling Soil-Borne Disease In Soybean With A Mustard Cover Crop, G. F. Sassenrath, C. Little, K. Roozeboom, X. Lin, D. Jardine

Kansas Agricultural Experiment Station Research Reports

Charcoal rot is a soil-borne disease that is prevalent in southeast Kansas. The disease infects multiple crops, including soybean, and causes yield reductions. A high-gluco­sinolate mustard with biofumigant properties reduced the population levels in soil and in soybean plants of the fungus (Macrophomina phaseolina) that causes charcoal rot. In this study, management practices that incorporate use of mustard as a cover crop in soybean production systems were tested. Results indicate that tillage increases the char­coal rot fungus. The mustard cover crop was tested in field studies for its impact on soil health, fungal disease and propagules, and soybean ...


Corn Planting Date And Depth – Impacts On Yield, G. F. Sassenrath, L. Mengarelli, X. Lin Jan 2019

Corn Planting Date And Depth – Impacts On Yield, G. F. Sassenrath, L. Mengarelli, X. Lin

Kansas Agricultural Experiment Station Research Reports

Corn growth and production is dependent on environmental conditions during the growing season. Optimal corn growth occurs between 50 and 86°F. Early-season soil temperatures may reduce corn emergence. Conversely, later-planted corn may not have adequate moisture for good pollination and grain production. This research tested the impact of planting date and planting depth on corn yield. The yield decreased with later planting dates. Earlier planting dates had better yield at lower planting depths, but yield was reduced at deeper planting depths at later planting.


Using Cover Crops As An Effective Weed Control Method In Southeast Kansas, L. I. Chism, J. A. Dille, G. F. Sassenrath Jan 2019

Using Cover Crops As An Effective Weed Control Method In Southeast Kansas, L. I. Chism, J. A. Dille, G. F. Sassenrath

Kansas Agricultural Experiment Station Research Reports

Weed control is important to optimize crop production. This study was conducted to compare the effectiveness of different methods of fall-implemented weed control strategies. These strategies included different cover crop mixes, chemical control, and mechanical control. The cover crop mixes included four different commonly-planted winter cover crops. The chemical control was a fall-applied burndown, and the me­chanical control was vertical tillage. We found cover crop mixes that contained cereal rye provided the most weed control, with the chemical control being a close second. Spring oats die during the winter because of the low temperatures. The three cover crop mixes ...


Biomass Production Of Single Species Cover Crop, G. F. Sassenrath, J. K. Farney Jan 2019

Biomass Production Of Single Species Cover Crop, G. F. Sassenrath, J. K. Farney

Kansas Agricultural Experiment Station Research Reports

Cover crops can benefit agricultural production by improving soil health and productivity, reducing weeds, and providing biomass for grazing. In this one-year study, biomass production was measured in 17 different single species summer cover crops and a fallow control. Overall, grass species produced more biomass than brassicas, with legumes, broadleaves, and fallow yielding intermediate amounts of biomass. Within the grass species, pearl millet, brown midrib (BMR) sorghum, and sorghum sudan produced more biomass than proso millet; German millet and browntop millet had intermediate biomass production. Within the brassicas, both brown and yellow mustards produced more biomass than collards. There was ...


Long-Term Nitrogen, Phosphorus, And Potassium Fertilization Of Irrigated Grain Sorghum, A. J. Schlegel, H. D. Bond Jan 2019

Long-Term Nitrogen, Phosphorus, And Potassium Fertilization Of Irrigated Grain Sorghum, A. J. Schlegel, H. D. Bond

Kansas Agricultural Experiment Station Research Reports

Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated grain sorghum in western Kansas. In 2018, N applied alone increased yields 44 bu/a, whereas N and P applied together increased yields up to 67 bu/a. Averaged across the past 10 years, N and P fertilization increased sorghum yields up to 75 bu/a. Application of 80 lb/a N (with P) produced the maximum yield in 2018, which is slightly less than the 10-year average. Application of potassium (K) has had no effect on sorghum yield throughout the study ...


Occasional Tillage And Nitrogen Application Effects On Winter Wheat And Grain Sorghum Yield, A. K. Obour, J. D. Holman, A. J. Schlegel Jan 2019

Occasional Tillage And Nitrogen Application Effects On Winter Wheat And Grain Sorghum Yield, A. K. Obour, J. D. Holman, A. J. Schlegel

Kansas Agricultural Experiment Station Research Reports

Occasional tillage ahead of winter wheat planting could alleviate herbicide-resistant weeds, redistribute soil acidification, and improve seedbed at wheat planting. The objective of this study is to determine occasional tillage and nitrogen (N) fertilizer application effects on winter wheat, and grain sorghum yields and soil quality in a wheat-sorghum-fallow cropping system. Treatments were three tillage practices: 1) continuous no-tillage (NT); 2) continuous reduced-tillage (RT); and 3) single tillage operation every 3 years (June-July) ahead of winter wheat planting [occasional tillage (OT)]. The sub-plot treatments were assigned to four N fertilizer rates (0, 40, 80 and 120 lb/a of N ...


Wheat Grain Yield And Protein Response To Nitrogen And Sulfur Rates, B. R. Jaenisch, R. P. Lollato Jan 2019

Wheat Grain Yield And Protein Response To Nitrogen And Sulfur Rates, B. R. Jaenisch, R. P. Lollato

Kansas Agricultural Experiment Station Research Reports

Winter wheat is often double-cropped after soybeans in no-tillage systems. The soybean crop removes large quantities of sulfur (S), which might unbalance ratios of nitrogen (N) to S for the following wheat crop. Our objective was to evaluate the responses of two wheat varieties to three N and four S rates representing a range of N:S ratios. The experiment was arranged as a complete factorial with a split-split-plot design. Variety was the whole-plot, N the sub-plot, and S the sub-sub plot. Nitrogen rates were 50, 100, and 150% of the recommended rate for 60 bu/a, which corresponded to ...


Correlation Between Mehlich-3 And Ammonium Acetate Extractable Potassium In Kansas Soils, B. Rutter, D. A. Ruiz Diaz Jan 2019

Correlation Between Mehlich-3 And Ammonium Acetate Extractable Potassium In Kansas Soils, B. Rutter, D. A. Ruiz Diaz

Kansas Agricultural Experiment Station Research Reports

The K-State Research and Extension Soil Testing Laboratory has been using Mehlich-3 soil test procedures for phosphorus (P) extraction, and ammonium acetate extraction for potassium (K). Previous research in other states has shown a strong correlation between these two tests for K, but data correlating the two in Kansas soils have been limited. A study was performed on soils from across the state to investigate the relationship between these two methods. A strong positive correlation was observed (r = 0.99) across the wide range of soil types, pH, and fertility conditions represented in the sample set. Linear regression suggests a ...


Winter Survival Of Experimental Bermudagrasses In The Upper Transition Zone, Mingying Xiang, Jack Fry, Yanqi Wu Jan 2019

Winter Survival Of Experimental Bermudagrasses In The Upper Transition Zone, Mingying Xiang, Jack Fry, Yanqi Wu

Kansas Agricultural Experiment Station Research Reports

A winter with very cold temperatures in 2017–2018 allowed for good separation of standard and experimental bermudagrasses for freezing tolerance. When evaluated in May 2018, survival of commonly used cultivars was: Tifway, 0%; Latitude 36, 20%; Northbridge, 25%. Some experimental progeny had up to 98% winter survival on the same rating date.


Management Strategies For Double-Crop Soybean Planted After Wheat, D. S. S. Hansel, J. Kimball, I. A. Ciampitti Jan 2019

Management Strategies For Double-Crop Soybean Planted After Wheat, D. S. S. Hansel, J. Kimball, I. A. Ciampitti

Kansas Agricultural Experiment Station Research Reports

Double-crop (DC) soybeans (Glycine max L.) are gaining popularity as an alternative system to intensify productivity without expanding the farming area and can potentially increase net return. However, the DC soybean system faces many challenges such as late planting, which decreases yield potential. A study was conducted in four site-years in Ashland Bottoms, KS, during the 2016 and 2017 growing seasons. In both years, the soybean variety planted was Asgrow 4232 (MG 4.2). The soybean was planted right after two different wheat harvest timings (Study 1, early-wheat harvest 18–20% mois­ture; and Study 2, conventional-harvest 13–14% moisture ...


Nutritional Quality Of Soybean Seeds Relative To Canopy Portion, L. H. Moro Rosso, W. D. Carciochi, I. A. Ciampitti Jan 2019

Nutritional Quality Of Soybean Seeds Relative To Canopy Portion, L. H. Moro Rosso, W. D. Carciochi, I. A. Ciampitti

Kansas Agricultural Experiment Station Research Reports

Soybean [Glycine max (L.) Merr.] seed quality (nutritional composition) is affected by genetic × environment × management (G × E × M) interactions. Even at the plant level, where differences might not be largely apparent, seed quality is known to change. This study aims to 1) compare seed yield and nutritional quality within the vertical profile of soybean plant canopy, and 2) explore potential interactions for different geno­types. A field experiment was conducted in Manhattan, KS, during the 2018 growing season. Treatments were composed by six genotypes and evaluated at four canopy portions: upper, middle, and lower sections of the main stem and ...