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Integrated Crop Management News

2004

Oceanography and Atmospheric Sciences and Meteorology

Articles 1 - 9 of 9

Full-Text Articles in Life Sciences

Damping-Off Prevalent This Spring, X. B. Yang Jul 2004

Damping-Off Prevalent This Spring, X. B. Yang

Integrated Crop Management News

The combination of early planting and abundant rains means soybean seedlings have been in cool and wet soil longer than normal this season. That combination creates the perfect breeding ground for soybean seedling diseases. In this Monday's teleconference, almost all Iowa State University Extension field crop specialists (FCS) reported occurrence of damping-off in their regions. Similar reports were received from agronomists from private companies. Replanting resulting from damping-off and other weather related soybean stand reductions has been reported by FCS varying in a range of 2 to 5 percent. Damping-off in corn is also reported.


Damping-Off Prevalent This Spring, X. B. Yang Jun 2004

Damping-Off Prevalent This Spring, X. B. Yang

Integrated Crop Management News

The combination of early planting and abundant rains means soybean seedlings have been in cool and wet soil longer than normal this season. That combination creates the perfect breeding ground for soybean seedling diseases. In this Monday's teleconference, almost all Iowa State University Extension field crop specialists (FCS) reported occurrence of damping-off in their regions. Similar reports were received from agronomists from private companies.


Spring Rain And Soil Erosion, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht Jun 2004

Spring Rain And Soil Erosion, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht

Integrated Crop Management News

Spring rains can come hard and fast as we experienced last week, causing substantial soil erosion when soils are most vulnerable because of degraded crop residue cover, soil preparation by tillage, and no crop canopy. The soil profiles in most of Iowa are now filled to capacity with water. The profiles are at or near saturation. Therefore, the intensity and amount of rain we received have exceeded the soil capacity to filter water and minimize surface runoff even in fields with the most adequate conservation practices.


Nitrogen Losses After The Heavy Rains, John E. Sawyer Jun 2004

Nitrogen Losses After The Heavy Rains, John E. Sawyer

Integrated Crop Management News

The recent heavy rains have raised questions about nitrogen (N) losses. In wet field areas it is common to find off-color corn, but that does not necessarily equate to N shortage. So be careful as you initially are seeing plant response to wet conditions (slowed root activity and growth). The amount of N taken up by corn to the V6 stage is small (about 20 pounds N per acre, so pale-yellow color is now due to wet conditions).


Hail Injury To Corn And Soybean, Jason De Bruin, Palle Pedersen May 2004

Hail Injury To Corn And Soybean, Jason De Bruin, Palle Pedersen

Integrated Crop Management News

Last weekend was certainly an eventful week in terms of weather across the state. Unfortunately, in several of those heavy rainfall areas hail also occurred, adding a whole new dimension to crop injuries. Along with the flooded fields that will reduce plant stands, the damage caused to the plant by hail will also have to be considered when making replant decisions. Corn and soybean differ in their ability to tolerate hail damage and to compensate for reduced stands. For both crops, however, it is essential to make good estimations of plant health and accurate stand counts in order to determine ...


Wet Weather, Stressed Corn, And Herbicide Applications, Kristine J. P. Schaefer May 2004

Wet Weather, Stressed Corn, And Herbicide Applications, Kristine J. P. Schaefer

Integrated Crop Management News

Wet weather conditions across much of the state have slowed or halted fieldwork and contributed to crop stress in many areas. Once fieldwork can be resumed, many corn growers may be facing the scenario of whether to spray postemergence herbicides or wait until weather conditions and crop growth have improved.


Frost Injury To Alfalfa, Stephen K. Barnhart May 2004

Frost Injury To Alfalfa, Stephen K. Barnhart

Integrated Crop Management News

The questions of frost injury on alfalfa (and other forage species) normally come in the fall, with the first or second frost of the fall/winter. What about the impacts of a late spring frost? Low temperatures, whether visible frost is present or not, will influence the growth of established forage plants as well as newly emerged seedlings.


Frost Damage, Palle Pedersen May 2004

Frost Damage, Palle Pedersen

Integrated Crop Management News

Temperatures this morning (May 3) reached 25 degrees with many corn and soybean fields getting close to emerge. In a few fields, crops have just started to emerge and with the low temperatures many may wonder if replanting now is needed.


Recent Weather And Herbicide Performance, Robert G. Hartzler May 2004

Recent Weather And Herbicide Performance, Robert G. Hartzler

Integrated Crop Management News

Much of Iowa has experienced frost or high winds, or both, in the past week, which can significantly affect herbicide performance. The recent frosts are a primary concern for no-till fields where burndown herbicides have been or will be applied to control existing vegetation. It is difficult to predict the influence of freezing temperatures because the response of weeds to these events is highly variable.