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Full-Text Articles in Life Sciences
Methods Of Analysis Of Yield From Antecedent Winter Water, Charles Gregg Carlson
Methods Of Analysis Of Yield From Antecedent Winter Water, Charles Gregg Carlson
Electronic Theses and Dissertations
This investigation is an evaluation of methods of analysis of water conserved during off-season periods and evaluation of the effect on the subsequent crop. Energy and water shortages during the midsummer peak irrigation season have forced farmers to consider the possibility of irrigation at times other than peak growth stages as an alternative practice. Dryland farmers are interested in the benefit of water conserving cultural practices such as summer fallow and snow trapping. To evaluate the benefit of these off-season practices, a yield function based upon water availability is necessary. In order to better understand the effects of off-season irrigation …
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Electronic Theses and Dissertations
Recycling non-renewable resources has become increasingly. important as man has continuously expected more and more from his environment. As stated by Spendlove (1976): "Recycling certainly is not new. It appears, in fact, to be one of the most obvious laws of nature, much like the seasons, the tides, and the life and death processes. It is not surprising, therefore, that the greatest motivating force behind present recycling efforts is the worldwide concern for the deteriorating natural environment." This ever-increasing demand for more production has created the need for more stringent pollution controls to maintain an acceptable quality of life. Pollution …
The Transfer Of Resistance To Wheat Streak Mosaic Virus (Wsmv) From Wheatgrass (Agropyron Intermedium (Host.) Beauv.) To Common Wheat (Triticum Aestivum L. Em. Thell.) By Irradiation, Harnek S. Sandhu
Electronic Theses and Dissertations
A virus disease, wheat streak mosaic, has been an important, unsolved problem of winter wheat which is a major crop in South Dakota. F1BC3 monosomic alien addition seeds having three doses of Centurk were irradiated with fast neutrons to translocate a segment of the alien chromosome accounting for immunity from wheat streak mosaic virus to a Centurk chromosome. Immune plants from the irradiated seeds were used as male parents onto Centurk and about 2,000 F1BC4 seeds obtained. Cytological examination of pollen mother cells of 151 resistant F1BC4 plants indicated that the …
Water And Nitrogen Husbandry For Irrigated Corn In Central South Dakota, Stanley Eugene Papendick
Water And Nitrogen Husbandry For Irrigated Corn In Central South Dakota, Stanley Eugene Papendick
Electronic Theses and Dissertations
The purpose of this study was to evaluate the effects of supplemental water and nitrogen on corn yields. Central South Dakota was chosen as the location for this study because of its existing irrigation and the limited research data available from that part of the state. The objectives were: (1) to determine corn yield response to various water regimes, (2) to determine corn yield response to nitrogen applications, and (3) to determine corn yield response to nitrogen application methods.
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
Electronic Theses and Dissertations
The soybean (Glycine max (L.) Merrill) is a very important world crop. The seed is rich in both protein and oil, making it a valuable human food resource. Many scientists believe that there are physiological barriers preventing increased soybean yields. Any agronomic discovery that would consistently increase soybean yields would be important to world food production. One possible yield barrier in soybeans concerns the mineral nutrition of the plant during the seed-filling stages of growth. During this period of growth, translocation of N, P, K, and S from the plant foliage to the developing seed occurs, accompanied by a virtual …