Effects Of Rice Straw Different Incorporation Ways On Rice Yield And Soil Ecology

Rational utilization of straw resource is one of the important topics in today’scirculation of agricultural research. In order to explore the influence of different strawcounters-field ways on rice growth and soil ecology, we carry out a four-year positioningexperiment study in2010-2013. Under the condition of equal NPK nutrient application, westudied the influence of straw returning full amount (S+F), straw returning all burning ash(B+F) and fertilization of chemical fertilizer (F) on double season rice growth, yield andsoil ecology with the purpose of illuminating the influence of straw returning full amounton double season rice growth and soil ecology and the main study results are as follows:1. The influence of total rice straw incorporation on rice growingTotal rice straw incorporation can obviously promote the occurrence of early ricetillers and rice stem tillers are significantly higher than the total returning straw burningash and fertilization of chemical fertilizer treatment, and the difference of the latter twoways is small; Late rice, on the other hand, is different from the early rice and thedifference of rice stem tillers number is smaller through these three fertilizer treatments.The results of the four-year positioning experiment show that total rice strawincorporation can significantly improve early rice production next year, with the returningtimes increasing, it also helps improve production of late rice.Under the same conditions of fertilization, yield components, and eight consecutivequarters of rice panicle was essentially flat, and the difference was not significant, however,it is more significant than no fertilization treatments. After1-4postseason of total rice strawincorporation, early and late rice grains per panicle emerged B+F>S+F>F trend, and afterreturning to field5-8season, the number of differences between each grain is manifestedthe processing S+F>B+F>F. The difference between setting rate and grain weight is notobvious.Phosphorus and potassium nutrient, the dry matter accumulation gradually showingS+F>B+F>F trend.Total rice straw incorporation can significantly improve rice nutrient absorption andaccumulation, and accumulation of NPK processing S+F were greater than F and B+F, andwith the field year extension, the effect is more obvious.Early and late rice root dry weight is much higher than without fertilization treatment,and the difference is remarkable. Fertilization of rice root mass was S+F>B+F>F, and the difference is remarkable.The full amount of straw to field can reduce fertilizer inputs, especially to reduce theamount of chemical fertilizers and reduce fertilizer costs and improve economic efficiency.2. The influence of total rice straw incorporation on soil ecologyCompared with the handling and processing of B+F and F, S+F treatment can reducesoil bulk density, improve soil porosity, aeration porosity and soil water holding capacity,improves soil physical properties. Total rice straw incorporation can help to improve theamount of soil organic matter, total nitrogen content, but on soil phosphorus, potassiumeffect was not significant.Compared with the handling and processing of B+F and F, S+F improved handling ofdifferent forms of carbon content of the soil and carbon management index. Correlationanalysis showed that soil carbon management index and double cropping early rice yieldwas significantly parabola with a correlation coefficient of early rice is0.9999*, and laterice is0.9798*.The difference of active treatment of catalase, invertase and urease in soil is small.Processing S+F improves soil methane emissions, and nitrous oxide emissions arelower than the processing F, but higher than the processing B+F, B+F treatment increasedsoil carbon dioxide emissions.