河北平原井灌区冬小麦灌水定额的计算分析

根据华北半湿润偏旱井灌区节水农业综合技术示范区的建设实践，在河北平原三河井灌区，通过实时监测冬小麦田间土壤含水率，计算出其田间土壤含水量与田间持水量之差即为灌水定额；当实时监测的田间土壤含水率低于冬小麦适宜生长含水率高于凋谢系数时，便对监测地块进行灌溉。采用移动式管道喷灌或支管退行式畦灌模式进行冬小麦灌溉，使灌水定额控制在750m^3／hm^2以内，达到节水增产增收的目的，促进农业又好又快发展。

Analysis and Calculation of Winter Wheat Irrigating Water Quota for Well Irrigation Area in Hebei plain

According to the practice of building water saving agricultural comprehensive technological demonstration plot in well irrigation area in sub-humid slight drought regions of North China,the field soil moisture content are calculated by monitoring the level of moisture content of the soil in real time in Sanhe well irrigation area in Hebei plain.The difference value between field soil moisture content and field moisture capacity is irrigating quota.Monitoring plot is irrigated as the level of moisture content of the soil in real time is lower than moisture content that is adaptable to the growth of winter wheat and is higher wilting coefficient.By irrigation models of sprinkler irrigation with portable-pipe or ridge irrigation via moveable back lateral pipe in irrigating winter wheat,the irrigating quota is kept within 750 m~3/hm~2,and the objective of saving water and in- creasing output are attained.