Study On The Utilization Of Large-scale Piggery Manure In Paddy Field

In recent years, the livestock and poultry breeding in China have been rapidly developed, which also increased the amount of poultry excrements. With the attention of the government to the pollution of intensified raising farms and the improvement of people's consciousness of environmental protection, proper disposal and appropriate using of animal manure had become an urgent task of present society.With Shanghai farm as the research object, this thesis designed the system of resource utilization of piggery wastes generally, conducted the ecological monitoring, studied the key skills of resource utilization of piggery wastes and provided theoretical basis and technical support for the popularization and application of piggery-farm agricultural cycle model. The main results are as follows.1,Rice plants haven't shown being victims under each liquid manure treatment, and some treatments increased the rice yield and improved the grain quality. Therefore, the utilization of piggery wastewater is feasible, which avoided the pollution of manure to the environment, fully used the nutrient of liquid manure and promoted synchro advance of economic and ecological benefits.2,During the jointing stage, the number of tillers decreased as the amount of liquid manure was higher and the substitution rate was larger. So it isn't appropriate to apply too much liquid manure before jointing stage and the conventional fertilization program is proper during the jointing stage. In the point of SPAD value, the more amount of liquid manure and the higher substitution rate caused the larger SPAD value, which was beneficial to the nitrogen absorption.3,There was significant parabolic curve correlation between the accumulation of dry material and yield during jointing and heading stage, but it appeared significant linear correlation during maturing stage. In the earlier growing stage of rice, leaf allocation ratio increased with the increasing amount of manure and higher substitution rate. However, the stem and sheath and spike distribution ratio increased with the decreasing amount of manure and lower substitution rate. It was opposite at the late stage. Therefore, improving the field management and fertilizer application during heading to maturing stage was necessary.5,The rate of N-holding and the rate of K-holding of rice plant under different treatments increased firstly and then decreased with the prolonging of the spans of growth period. Under the condition of this experiment, the treatment of 70%M and 100%M were beneficial to the nitrogen absorption. And 70%M treatment was most favorable to potassium absorption.6,An optimized program about liquid manure utilization should realize the coordination of four goals, like high yield, good quality, little harmful influence on ecology and large load quantity of liquid manure to rice. Under the condition of this experiment, rice yield under the treatment of 70%M,40%M,40%L,70%L,100%H and 40%H was higher than that under the conventional fertilization. In view of grain quality, with the higher amount of liquid manure and larger substitution rate, the milling quality and the appearance quality of rice would be better, but the cooking quality would be worse. Therefore, considering thoroughly, the treatment of 70%M was the best fertilizing program.