Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 7 of 7

Full-Text Articles in Life Sciences

Response Of Soybeans And Wheat To Limestone Application On Acid Soils In Rio Grande Do Sul, Brazil , Otavio J. F. De Siqueira Jan 1980

Response Of Soybeans And Wheat To Limestone Application On Acid Soils In Rio Grande Do Sul, Brazil , Otavio J. F. De Siqueira

Retrospective Theses and Dissertations

Yield responses of soybeans (Glycine max, L) and wheat (Tritcum aestivum, L) to limestone applications were evaluated on several acid soils (Oxisols) of the Rio Grande do Sul plateau region, Brazil.;Seven field experiments were conducted during a five-year period to evaluate the efficiency of lime rate in relation to varying soil acidity conditions and time after lime applications.;Soil textural properties were related to the effect of lime treatments on the soil pH, on the exchangeable Ca + Mg content, and on CEC properties of the soils in this study. Maximum soil pH values occurred at higher values on the ...


A Simulation Study Of Corn Production And Low-Temperature Drying For Central Iowa , Gary Richard Van Ee Jan 1980

A Simulation Study Of Corn Production And Low-Temperature Drying For Central Iowa , Gary Richard Van Ee

Retrospective Theses and Dissertations

Two computer models, CORNSIM and FALDRY, were developed and used to conduct a simulation study of corn production and low-temperature drying for Central Iowa conditions. CORNSIM simulates a complete corn production enterprise. Given a specific management strategy, machinery capacity, and cropping season, CORNSIM simulates planting, crop development, yield, and harvesting. CORNSIM was developed to provide the simulated flow of harvested grain. FALDRY simulates a system of low-temperature corn drying bins. FALDRY inputs include bin specifications, weather data, and the incoming flow of harvested grain. FALDRY was developed to predict the success or failure of a low-temperature corn drying system and ...


A Solar-Heated Grain Dryer For The Tropics , Virgilio G. Gayanilo Jan 1980

A Solar-Heated Grain Dryer For The Tropics , Virgilio G. Gayanilo

Retrospective Theses and Dissertations

No abstract provided.


Host-Symbiont Interactions Among Frankia Strains And Alnus Open-Pollinated Families , Charles Alvin Maynard Jan 1980

Host-Symbiont Interactions Among Frankia Strains And Alnus Open-Pollinated Families , Charles Alvin Maynard

Retrospective Theses and Dissertations

Four sources of Frankia endophyte were tested with four seed sources of Alnus spp. host plants in all possible combinations. Alnus glutinosa (L.) Gaertn. and Alnus rubra Bong. plants grew better with a spore (-) strain from The Netherlands than with a spore (+) strain from The Netherlands or with either of two strains from the United States;Two Frankia strains, CpN1 and ArI3, were compared as pure culture and crushed nodule derived inocula on two seed sources of A. glutinosa and two seed sources of A. rubra host plants. The A. glutinosa plants treated with pure culture inocula nodulated more quickly ...


Heat Transfer In A Beef Manure Anaerobic Digester , Thomas Hobson Greiner Jan 1980

Heat Transfer In A Beef Manure Anaerobic Digester , Thomas Hobson Greiner

Retrospective Theses and Dissertations

In cold climates it was determined that the heat loss from the hot effluent of a beef manure anaerobic digester represented a sizeable portion of the energy production of the digester. This suggested an effluent to influent heat exchanger was necessary. Available heat exchangers were unsuitable;A different concept heat exchanger using a vertical flat plate for the heat transfer surface with the hot and cold flows passing on either side was then considered. The exchanger would be divided into a number of tanks with an overall counterflow arrangement. The extra tanks and the counterflow arrangement would increase the effectiveness ...


Minimizing Cold Weather Energy Demand Of Swine Confinement Housing , Raymond Leroy Huhnke Jan 1980

Minimizing Cold Weather Energy Demand Of Swine Confinement Housing , Raymond Leroy Huhnke

Retrospective Theses and Dissertations

A computer model was developed to predict the thermal and electrical energy required to provide a controlled atmospheric environment for life-cycle swine production. Using short time-interval climatological data recorded in central Iowa, the simulation can estimate the total energy requirements of a swine facility based on building construction, floor type, and environmental management choices. The simulation considers building conduction, solar, and ventilation heat transfers as well as animal heat production. Ventilation is based on temperature control and recommended practice to maintain optimum animal performance;The model was used to predict January energy demands for nursery, finishing, and farrowing buildings having ...


Heat Transfer And Mixing Energies In Digesting Beef Manure, David Robert Smith Jan 1980

Heat Transfer And Mixing Energies In Digesting Beef Manure, David Robert Smith

Retrospective Theses and Dissertations

No abstract provided.