冬小麦调亏灌溉制度田间试验研究初报

A preliminary study on the regulated deficit irrigation system of winter wheat.

大田试验结果表明,拔节期为冬小麦水分最敏感的生育时期,其次为孕穗期和抽穗～开花期,而返青～起身期充分供水则造成冬小麦明显减产。拔节期最大调亏程度为0～50cm土层土壤含水量≥田间持水量的65％,过小则导致明显减产;孕穗～抽穗期、抽穗～灌浆前期最大调亏程度为0～80cm和0～100cm土层土壤含水量≥田间持水量的60％;灌浆后期最大调亏程度为0～100cm土层土壤含水量≥田间持水量的50％,由此建立了冬小麦调亏灌溉制度。

Field results at Luancheng Agro-ecosystem Station,CAS show that the most sen-sitive stage to water stress for winter wheat falls on jointing,then the following are booting and heading to flowering stages ,while too much water supply during turning green to lifting will reduce winter wheat yield. The critical levels of soil water content for winter wheat are no less than 65% of field capacity for 0-50cm soil layer during jointing stage,60% for 0-80cm during booting to heading and 60% for 0-100cm during heading to initial milky stage, 50% for 0-100cm during milky stage,respectively. At those stages,when soil water content is below the critical level,yield will be greatly reduced. Based on the results,regulated deficit irrigation system is established for winter wheat.