摘要
黄土高原南部土层深厚疏松，质地中壤，土壤水分性质优良，作物具有良好的水分生态环境。对农田水分条件及其产量效应进行了定量评价，结果表明：东部旱塬农田水分亏缺率和减产率为３０％左右，西部旱塬为１０％左右。同时还对旱作水分产量潜势进行了估算，结果表明：在目前生产力条件下冬小麦旱作水分产量潜势为５３３０～６３００ｋｇ／ｈｍ￣２，春玉米为７７００～９０００ｋｇ／ｈｍ￣２。此外，水肥产量效应的研究指出，目前水分亏缺发生频率为５０％左右，养分为１００％；养分对提高作物产量具有普遍性，不论何种水文年型，增加农田养分投入均可显著提高作物产量。
In the south of loess plateau,soil water properties are excellent and crops have a prop-er water environment.The field water condition and its effect on crop yield are appraised anddryland productivitv is estimated.The results show that,the rate of field water deficiency is 30%in the east and 10%in the west;in current condition of productive forces,the potential produc-tivities in dryland are 5 330～6330kg/hm￣2 and 7 700～9000kg/hm￣2 for wheat and corn respec-tively.
出处
《水土保持通报》
CSCD
北大核心
1995年第6期6-10,共5页
Bulletin of Soil and Water Conservation
