American society of agronomy soil science society of america clay robinson earned bs and ms degrees from west texas state university with a concentration in plant science agronomy and a phd in soil management from iowa state university he is a certified professional soil scientist and former professor who taught soil science and agronomy courses at two universities from 1992 to 2011 he . The american society of agronomy lists eight areas of interest to agronomists 1 soil properties 2 how soil interacts with a crop 3 nutrient fertilizer needs of a crop 4 when and how to apply nutrients 5 how crops develop 6 how climate affects crops 7 how to control weeds insects and diseases and 8 how to grow crops profitably while protecting the environment major . The penn state agronomy guide is designed as a quick reference for information on crop and soil management including varieties nutritional requirements establishment and harvesting storing seed and grain and farm management and budgeting recommendations for managing weed insect and disease pests in corn grain sorghum soybean small grains and forages are provided in part 2. Sandy soils have lower water holding capacity while silt and clay soils tend to have higher water holding capacity a crop grown in a sandy soil will need to be irrigated more frequently but with less total water than a crop grown in a clay or silty soil a clay or silty soil will hold more water for the crop to use so can be irrigated less frequently compacted soils have less pore space
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