【摘要】 综合评价各种作物需水量计算方法的精度和适用条件 ,对比联合国粮农组织推荐的两种主要作物需水量计算方法 ,修正Penman法和 Penman-Monteith方程 ,分析田间持水率作为编制灌溉计划的重要指标所存在的缺陷 ,最后介绍采用电子表格软件手段代替传统 BASIC语言进行灌溉制度设计的程序化处理的方法。更多还原

【Abstract】 In this paper,the author evaluates several kinds of computing crop water requirement methods through analyzing its accurate and applicable condition,compares Modify Penman with Penman Monteith Formula which are both the main mathematical models that FAO recommended to compute crop actual evapotranspiration,then discusses defect in drawing out irrigation schedule by field capacity.At last introduce a new way by means of using computer software Spreadsheets to replace conventional BASIC program working out irrigation schedule.更多还原