Study On Irrigation Schedule Of Corn Under Film Hole Irrigation

Setting reasonable irrigation schedule is an important task of relieving China's water crisis and constructing water-saving social, also is the basis of setting water resource optimum attemperation plan and establiashing prime collocation and distribution in irrigation management. Film-hole irrigation is one of new water-saving technology, it is vastly applied in variety crops because of its staunch and calefacient domino effect and obtained diplex effection in water conservancy and increase production. The paper combined real production instance researched different film -hole irrigation schedule's influence on corn's developing status , soil water content ,yield, and water use efficiency in field .On the basis of film-hole irrigation technology basic experiment in 2004, can abecedarian elicite six conclusions as follow:1. It experienced two highly soil water consumption periods in the whole growing periods:(jointing stage ~ trumpet stage),(earing stage ~ milk stage), in these periods :soil water content distributing assume"v". Irrigation degree's changing has greatly influenced soil water content as applied same irrigation water; while in same irrigation degree, adding irrigation water condignly can increase soil water content, but excess some ambit can not increase soil water content.2. Evapotranspiration of corn is increasing with irrigation water's adding, it arrived maximum in (jointing stage ~ earing stage) and (earing stage ~ milk stage), the sum of ET in these two periods take up 65%~85% of whole ET,and the stress sentative index is higher than other stages,so there are critical periods.3. Compared with no mulch treatments, film-hole irrigation's efficiency is obviously, it can increasing yield 2046.84 kg/hm2 underthe same irrigation schedule, yield increased 15.71% , WUE increased 3.52%.4. The relations of ET and yield, irrigation water and yield are all assume good parabola; when the yield is attained maximum adding irrigation water can not only increase yield but also induce yield decline. When ET arrived 6710 m3/hm2 no marginal yield .5.In the paper studied 9 kinds irrigation schedule , the schedule of irrigated 4 times,4500...