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to 3 3 Drainage of irrigated land
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agricultural antecedent soil moisture application of soil basic channel stabilization climatic Coastal Plains conservation practices Cover crops crop sequences crop yields cropland cropping systems Data are needed depth development of sedimentation drainage drains Driftless area dryland farming economic effects erosion control evaluation factors fertilizer field flow forage grading grasses and legumes ground water growth hydrologic improve Information is needed irrigation irrigation systems kinds of soil land legumes materials measures methods Nebraska needed to determine Oklahoma pastures plants ponds predicting problem areas production Puerto Rico rainfall range rangelands relationships Research is needed residues runoff saline and alkali sediment yields seed selected benchmark soils slopes soil and water Soil Conservation Service soil management soil moisture soil structure South Dakota specific studies are needed subsoiling surface terraces Texas tillage Wasatch Front water conservation water losses Water management watersheds weed control wildlife Windbreaks Woodland management