Crop and Soil Sciences Resources
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This publication is intended to be used by those familiar with calibrating a center pivot system. The circular lists the steps, calculations, and charts needed to calibrate a center pivot irrigation system pumping wastewater, without explanations of the process itself. The PDF version contains worksheets and formulas.
The step-by-step calibration procedure includes determining: the wetted diameter of your nozzle or sprinkler; spacing between collection cups; the number of cups needed to collect wastewater from all sprinklers/nozzles. Next, place collection cups in a row, equally spaced in the direction of travel, mark the starting point and then operate the pivot normally and mark the end point. Measure the time taken for the system to pass over all cups. Measure between the start and end points to determine the travel distance. Immediately record the volumes or depths of water in each collection cup and use this to calculate the average application depth (in inches, centimeters, or millimeters). Next, determine your “usable” cups and effective diameter of pivot, and then recalculate the average application depth for the “usable” collection cups. Calculate the reference travel speed and the deviation depth for each “usable” collection cup. Next, determine the average deviation depth, calculate the application uniformity and determine the calibration results.
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La bermuda es una planta perenne de estación cálida ampliamente utilizada para su uso como césped en el sudeste de los Estados Unidos.
[Although improved common (Cynodon dactylon (L.) Pers.) and hybrid bermudagrasses (Cynodon dactylon x C. transvaalensis Burtt-Davy) have desirable qualities as turfgrasses for heat, drought and wear tolerance, bermudagrass is a problematic weed when grown in mixed stands with other turf species. Selective control of bermudagrass is difficult but often warranted in order to maintain acceptable quality of the desired turfgrass species. This publication describes bermudagrass control methods for Southern lawns.]
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Aflatoxin is a naturally occurring toxin produced by the fungus Aspergillus flavus. The fungus can be recognized by a gray-green or yellow-green mold growing on corn kernels in the field or in storage. Plant stress due to drought, heat or insect damage during fungus growth usually increases aflatoxin levels. Aflatoxin contamination will reduce feeding value and hinder sales. Because it is extremely poisonous to warm-blooded animals even at relatively low levels, grain handling facilities often check for the presence of the toxin before purchasing corn.
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La lespedeza común (Kummerowia striata (Thunb.) Schind syn. Lespedeza striata) es una leguminosa anual de verano sin organización en sus ramificaciones, que es una maleza problemática en céspedes de jardines residenciales así como en otras áreas de césped.
[Common lespedeza (Kummerowia striata (Thunb.) Schind syn. Lespedeza striata) is a freely branched, summer annual legume that is a problematic weed in lawns and other turf areas. This publication describes ways to identify and control Lespedeza in turfgrass, including cultural control methods, preemergence herbicides and postemergence herbicides.]
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Annual bluegrass (Poa annua L.) is a problematic winter annual weed in residential turf. Compared to most turfgrasses, annual bluegrass has a lighter green color, coarser leaf texture and produces unsightly seedheads. Contrary to its name, both annual (live for one season) and perennial (live for many seasons) biotypes of annual bluegrass may be found in turf. This publication describes methods of control for annual bluegrass in residential turfgrass lawns.
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This publication discusses ways to identify and control Virginia buttonweed, a troublesome broadleaf weed in turfgrasses throughout the Southeast.
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This publication provides information on selecting an optimal soil sampling grid size that can accurately depict spatial nutrient variability within the fields in the southeastern US and helps in informing precision site-specific nutrient applications.
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B 1242-2
Total Maximum Daily Loads in Georgia
A total maximum daily load (TMDL) is a calculation of the maximum amount of a pollutant that a water body can receive and still meet water quality standards. This publication contains comprehensive information about total maximum daily loads in Georgia, including their importance and how to establish an implementation plan.
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B 1242-3
Georgia’s Water Quality Standards
The Environmental Protection Division (GAEPD) of the Georgia Department of Natural Resources (GADNR) is responsible for setting and enforcing water quality standards. The goals of establishing these standards are to “provide enhancement of water quality and prevention of pollution; to protect the public health or welfare in accordance with the public interest for drinking water supplies, conservation of fish, wildlife, and other beneficial aquatic life, and agricultural, industrial, recreational, and other reasonable and necessary uses and to maintain and improve the biological integrity of the waters of the State.” This publication contains comprehensive information about Georgia’s water quality standards and what the public should know about bodies of water that do not meet these standards.
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