Effects Of Straw Application On Rice Growth And Redox Substance In Rice Fields

Straw Application on one hand can improve soil physical and chemical properties, soil fertility, rice yields; on the other hand, it can reduce the input of inorganic fertilizers, production costs, and the threat to the ecological environment. Straw has been more and more applicated to rice production. People have done a lot of research on the way, time, quantity of straw as well as rice growth and development under straw application. But it is largely confined to straw fertilizing effect and impact on soil properties, research on farmland ecological environment effect and stiff seedlings phenomenon caused by straw is very rare. Therefore, the present study carried out straw paddy soil environment and the growth of rice in conventional fertilization management in four straw processing, analysis the straw rice growth and development, yield formation, paddy soil redox the nature of the soil surface water pH and oxygen content of soil organic matter content and soil fertility changes stalk, and give a comprehensive understanding of the physical and chemical properties of soil change on rice growth and yield formation. It is to reduce the occurrence of stiff seedlings in the large area of rice production, improve resource utilization, accelerate the promotion of crop straw practical significance. The main findings are as follows:1Effects on Rice Growth and absorption of mineral elements after Straw Application.Compared with CK, treatment A and B was significantly lower in the early (before heading) on dry matter accumulation, leaf area index and root activity, were reduced by3.5%-14.6%,21.1%-27.6%and5.9%-19.5%, the content of mineral elements in various organs of rice showed that straw application significantly reduced the pre-manganese, zinc, sodium, and magnesium content, the impact of rice root activity, growth and development, inhibited the of rice tillers, slowed the of group development. Rice containing N, P, K rate increased by5.9%,2.1%and0.39%respectively, and the mature rice cumulative suck tendency to increase the amount of N and K positively correlated with increased range and number of straw quarter, promotion of assimilate to Grain, thereby enhancing the mature rice organ N, P, K content. Straw application decreased the number of spikes, but a significantly increased the number of grains per spikes, and overall performanced to improve the yield, the yield increased to3.0-9.9%.2Effects on Redox Substance and soil fertility in Rice Fields after Straw ApplicationStraw decomposd peak in the fourth week after rice transplanting, during this period, A and B reduced the soil pH and Eh by7.4%-8.8%and5.1%-22.4%respectively,and the difference was significant. The study on the content of reducing substances showed that21-28days after rice transplanting the content of soil reducing substances and soil active reducing substance were increased, especially the activity reducing substances and Fe2+were sharply increased by86.5%-87.8%and7.0%-9.7%.It is probably because straw decomposed in the paddy fields, enhanced soil reduction, produced ferrous reducing substances and other harmful substances. Straw application also changed the the paddy water ecological environment, A and B decreased the pH and oxygen content of paddy water by4.2%-6.7%and17.9%-68.4%.After2years of planting, P2O5and K2O in the soil had a certain decline. Straw application can alleviate the decline, compared with CK, soil organic matter content, soil total nitrogen content of A and B were increased by1.8%-5.8%and8.3%-11.2%, nitrogen, potassium and available phosphorus content were also increased by3.7%-4.2%25.3%-26.9%and4.1%-4.7%.Straw application on the soil fertility size the role of the order of A> B> D> C, which is subjected to field season the number of significant effect.