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...Factors affecting crop production climatic edaphic biotic physiographic and socio economic growth internal external genetic or heredity environmental a b c d e i the increase in yields other desirable characters are related to make up of plants high yielding ability early maturity resistance lodging drought flood salinity tolerance insect pests diseases chemical composition grains oil content protein quality fineness coarseness straw sweetness juiciness above less influenced by since they governed phsiographic nearly yield is attributed influence following atmospheric weather variables which influences precipitation temperature humidity solar radiation wind velocity gases includes all water falls from atmosphere such as rainfall snow hail fog dew one most important factor vegetation place total amount distribution greatly affects choice cultivated species heavy evenly distributed areas crops like rice plains tea coffee rubber western ghats grown low uneven common dryland farming where ...