The Decomposition Rate And Field Effects After The Returning Of Whole Maize Stalk Into Farmland

Compare three experiments that were arranged in the north station experiment for two years, northwest station experiment lasting four years and the complementary test by field investigation in this paper. The results showed that:1 .The decomposition rate of crushed straw incorporated was up to the rate of whole straw in the two month before the straw live through the winter. The residual solid were nearly equality in the both incorporation treatments after the winter. The decomposition rate arrived at 85% in the September. The solid of remain is rotten straw.2. The soil humus changes were analyzed in the all-different treatment in the winter wheat growth phrase. There was no notable divergence between the whole incorporation treatments with crushed straw. But the significant different lied between the straw incorporation treatments with no straw showed straw incorporation could increase the soil humus.3.The moisture content in the crushed straw was under the whole straw for its full structure. The moisture in the whole straw could release step by step in the crop growth ensure the soil moisture content. It could eliminated the side effect on straw decomposition absorb water from soil that cause crop lacked water to grow.4.The corn straw incorporated could built up the soil fertilty by increased the soil organic matter, decreased the soil bulk density and improved the aggregate structure.5. The ratio of C and N in soil varied from 13.86 to 17.23. It tured out that the phenomenon crop growth restrain for scramble the nitrogen element with the straw decompostion has disappearance. And soil phosphorus element didn't increase after the straw incorporation.6.The soil carbon element transfer regularity as following by measurated the soil respiration degree.The first: The daily soil respiration peak came about 13:00 in every day. The second: The soil yearly respiration peak came in the August, the other peak came in the October for ploughing and fertilizing7. The winter wheat production ascended by 6.21 to 8.23 percent after the corn straw incorporated in the north station experiment. The result shows that increase production was significantly between treatments of both whole and crushed straw incorporation with no straw.The whole corn straw incorporated effect on straw decomposition rate, and improve the soil physical, chemical and biology properties, and built up the soil fertilty, and increased the crop production as many as the crushed straw. However, with benefit of saving labors, saving time, and saving money, the whole corn straw incorporated was easy to be accepted by farmer and easty to apply and extend in the country,.