冬小麦节水高产栽培的生理基础

中国农业大学在严重缺水区河北沧州吴桥实验站,通过多年的试验研究,形成了一套冬小麦节水高产栽培技术体系.在这一技术体系中,冬小麦节水高产的主要生理基础是:在充分利用土壤贮水的基础上,合理分配有限的水资源;采用农艺措施,调整产量结构,补偿水分胁迫对高产的不利影响;中后期适当灌溉补水,增加光合产物积累量和提高经济系数.通过应用本套技术,可在实现相等产量指标的前提下节约灌溉水75150mm,水分利用效率提高到1.5kg/m3以上.

Physiological Basis of Cultivation TechniquetoSave Water in High-yielding Winter Wheat Production

A system for cultivating winter wheat that utilize less water while producing high yields has been developed in five years of research (1991-1996) at the China Agricultural University's Wuqiao Expriment Station at Cangzhou Prefecture in Hebei Province. The principal components of the cultivation system are (1) increasing uptake of water stored in the soil by the limiting and rational distribution of water; (2)regu-lating yield components by agrotechniques such as late-sowing, higher planting rates, increased use of phosphorus fertilizer, adjusted irrigation rates, etc; and (3)increasing photosynthate accumulation and harveat index by limiting irrigation after the stem elongation stage, Compared to traditional high-yielding techniques, this system can save between 750m3 and 1500m3 irrigation water per hectare and increase grain production/ water ratio 1. 2kg/m3 to 1. 5kg/m3.