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The records of daily solar radiation (Rs, MJ·m-2·d-1) are the important inputs for crop simulation models. However, forsome model users, Rs at longer

参考作物需水量ꎬ也称参考作物腾发量(referencecrop evaportranspirationꎬ简称ET0)是现代农业水文研究中的重要参数ꎬ对计算作物需水量、设计灌溉工程、实施节水农业生产具有重要的意义ꎮ 1998 年联 合国粮食及农业组织发布了«作物需水量计算指南»(联合国粮食及农业组织灌