Study On Water And Fertilizer Use Of Sweet Corn And Soil Physical Properties Variation Under The Water-saving Irrigation

Developing highly effective water-saving agriculture, promoting and applying water-saving irrigation techniques are important measures to promote the reasonable use of agricultural water resources, raise the agricultural water resources use efficiency and actualize the agricultural sustainable development; the agriculture water-saving irrigation has already been the important research content of water resources study. To embark from the water-saving irrigation research content relative request, to focus on the effects of different water-saving irrigation ways on the crops, the soil and the water-fertilizer effect, this experimental study was performed. The experiment was for the purpose of discussing the impacts of the water-saving irrigation way on the soil physical properties, the soil fertility and sweet corn's water productivity under the water-saving irrigation way, the nutrient use ratio and the water requirement law, which provided the reference for further study of the water requirement law, the irrigation schedule of the local crops, at the same time, also provided the certain theory basis for the promotion of the water-saving irrigation. This experiment was carried out in the irrigation and water resources modernization demonstrating garden in Cai Dian, Wu Han. Through the field observation and the indoor physics and chemistry analysis, the experiment studied the effects of the water-saving irrigation way on such physical properties as soil porosity, structure, moisture characteristic and water productivity, the nutrient use efficiency, the growth status and the yield component of the sweet corn under the water-saving irrigation way. Main results were as following:First, in any fertilization rate, among three irrigations ways, soil total porosity, aeration porosity, fast-acting porosity under the drip irrigation were biggest, and those under the conventional irrigation were smallest; the soil porosity and the constitutive property under the water-saving irrigation were obviously better than those under the conventional irrigation: those under the drip irrigation were best, under the sprinkling next, and under the conventional irrigation worst. The water-saving irrigation could maintain the fine soil structure after plowing, and was more advantageous to crops' growth.Second, compared with the conventional irrigation way, the water-saving irrigation ways were able to maintain the ability to conduct and hold soil water of the soil after plowing on the very great degree; After applying the water-saving irrigation technology, the specific soil water capacity was increased, and the soil water supply performance or the soil moisture validity were also strengthened.Third, in any fertilization level, the irrigation water productivity of the corn among the three irrigation methods was W2 > W1 > W0; Under any irrigation method, the irrigation water productivity of the corn among different fertilization levels was F2 > F1 > F0. Among different treatments, the biggest irrigation water productivity of the corn was W2F2 with 2.74 kg/m3, the least was W0F0 with1.24 kg/m3。Forth, in the fertilization level F1, the nitrogen, phosphorus and potassium use efficiency from the fertilizer were W0 > W2 > W1; while in the fertilization level F2, were W1>W2>W0.