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Full-Text Articles in Plant Sciences
Comparison Of Two Phosphorus Tests On Calcareous Soils Of Eastern South Dakota, Mohamed Ali
Comparison Of Two Phosphorus Tests On Calcareous Soils Of Eastern South Dakota, Mohamed Ali
Electronic Theses and Dissertations
Phosphorus is an important nutrient in crop production, since many soils in their native state do not contain sufficient available phosphorus to maximize crop yield. Now, more than ever, the importance of an adequate supply of plant nutrients to insure [sic] sufficient crop production is being recognized. Soil scientists and agronomists are continually striving to overcome nutrient deficiencies as well as use improved management practices in order that yields may more nearly approach the genetic limit of crop plants. Phosphorous forms sparingly soluble compounds with divalent and trivalent cations in soils. Therefore, the amount of P in the soil solution …
Studies On Perennial Weed Control In South Dakota, Steven Robert Gylling
Studies On Perennial Weed Control In South Dakota, Steven Robert Gylling
Electronic Theses and Dissertations
Studies were conducted to measure efficacy and economics of selected herbicide treatments for leafy spurge control in pasture, and to characterize the interaction of ammonium sulfate and glyphosate for quackgrass control. Several treatments resulted in leafy spurge control exceeding 90% in the tested pasture. Mean herbage dry-weight yield in treated plots was 2340 kg/ha, a 67% increase over untreated plots. Forage yields did not significantly differ among treatments controlling 90% or more leafy spurge. Marginal net return over marginal cost from herbicide treatments ranged from $35 to loss of $63/ha. Treatments providing satisfactory leafy spurge control with minimum economic risk …
The Effects Of Nitrogen And Tillage On Denitrification Rates And The Yield Of Corn, Oats, And Soybeans In Eastern South Dakota, Brian Robert Hilton
The Effects Of Nitrogen And Tillage On Denitrification Rates And The Yield Of Corn, Oats, And Soybeans In Eastern South Dakota, Brian Robert Hilton
Electronic Theses and Dissertations
Two field experiments were established in 1983 to evaluate the effect of nitrogen (N) on corn, oats and soybeans grown under various tillage sytems [sic] in east central South Dakota. A corn-oats rotation was grown under moldboard plow (MP), chisel plow (CH), and no-till (NT) tillage systems in a Poinsett silty clay loam soil (Udic Haplaboroll, fine-silty, mixed). In southeast South Dakota a corn-soybean rotation and a continous [sic] corn rotation were grown under MP NT and till plant (TP) and MP CH and NT systems, respectively on an Egan silty clay loam soil (Udic Haplustoll fine silty mixed). Nitrogen …
An Ecological Study Of The Vegetation Of The Grand River/Cedar River, Sioux, And Ashland Districts Of The Custer National Forest, Paul Luther Hansen
An Ecological Study Of The Vegetation Of The Grand River/Cedar River, Sioux, And Ashland Districts Of The Custer National Forest, Paul Luther Hansen
Electronic Theses and Dissertations
A land-classification system based on potential natural vegetation is presented for the Grand River/Cedar River, Sioux, and Ashland Districts of the Custer National Forest. The districts are located in northwestern South Dakota, southwestern North Dakota, and southeastern Montana. The vegetation was characterized according to habitat type based on concepts and methods developed by Daubenmire. A total of 169 stands were intensively sampled over a four-year period. Twenty-six habitat types were described including eight steppe, nine shrub-steppe, four woodland, and five forested habitat types. In addition, two shrub-steppe community types were identified. A diagnostic key is provided for field identification of …
Response Of Five Spring Wheat Cultivars To Drought, Gregory Keith Hess
Response Of Five Spring Wheat Cultivars To Drought, Gregory Keith Hess
Electronic Theses and Dissertations
Response of plants to water stress are numerous and interrelated. Morphological traits and growth patterns have been studied and reviewed extensively. Root growth patterns, leaf area and thickness, presence of cuticle hair and waxes, leaf movement, and wilting are only a few traits studied. Metabolic functions and how water stress affects these processes through stomatal behavior, transpiration rates and carbon dioxide exchange rates have also been reviewed. Plant breeders are continually searching for traits which aid in selecting for high yielding genotypes in any one environment. Moisture is often limiting in South Dakota's environment, leading to relatively low grain yields …