冀中平原冬小麦—夏玉米一体化节水栽培技术

Water-saving Cultivation Techniques for Winter-wheat and Summer-corn in the Middle Plain Area of Hebei

实验表明：冬小麦的灌水量直接影响下茬玉米的土壤水分；冬小麦耗水量与产量、冬小麦力。夏玉米的总耗水量与产量均呈抛物线关系。因而减少非关键生育期的灌水对产量影响不大。根据天然降水分布规律，选用全生育期９０天左右的玉米杂交种，６月２０日以前播种，８月上旬抽雄，使主要需水期与降水高峰相吻合，尽量减少夏玉米的灌水。通过作物干旱胁迫试验，找到作物不同生育期的减产系数，为制定节水型灌溉制度提供依据；通过对土壤水分的观测发现，在作物播前、收后土壤内均有部分速效水，充分利用土壤水是节水栽培技术的重要措施之一。

Experiments indicate that water application for winter-wheat affects directly the content soil water for Antumn-corn. The relationship between water consumption of winter-wheat and its yield and the relationship between total water consumption of winter-wheat plus Summer-corn and yield are Parabolic, so the impacts on yield by reduced water application in non-crucial growing season is not significant. According to the distribution law of precipitation, corn hybrid strain whose growing season is about 90 days was selected,sowed before 20June and cars were formed in early august. Thus, the main water demand season is made coincident with precipitation peak and water application for summer-corn minimized. Through crop water stress experiment, coefficients of yield reduction in defferent growing stages were found and tile basis for scheduling water saving irrigation system was laid. Observation of soil water concluded that there are some water reading avaible in the soil before seeding and after harvestion. Consequently, making good use of soil water is one of the important water-saving planting technigues.