Study On Straw Returned Field And Enrich Fertility In Cold Region

Considerate the climate characteristic of cold high latitude area in Heilongjiang province, study the technology tnat straw is returned to field can enrich paddyfield in order to realize sustainable development of rice. Combined potted plant, patch test, fixed plot test and great area demonstration. Study on the method combined different ecological basic point with local experiment. Discuss proper quantity, method, period and using fertilizer technology of returned directly straw to field. Researching the method of stacking organic fertilizer in short time. Formed the enrich paddyfield technology system of returned directly major straw and piled minor it to field.1 The technology of dealing with straw and ploughing up fieldReturning directly quantity of straw to field: It is proper quantity between 350 and 650 kg a unit of area per year. All of straw in the year can be returned to field. Shatter the straw into 10cm and scatter it, and plough field 10-15cm in this fall, then plough field in next spring, at last, transplant rice seedlings by machine or manpower.2 Fertilizing technologyThe quantity of nitrogen phosphorus and kalium fertilizer used in normal. All phosphorus fertilizer is applied one time as basic fertilizer. The proportion of Basic and spike fertilizer of kalium is 6 to 4. Fertilize nitrogen technology: Use nitrogen fertilizer in normal in the first two years after returning the straw. It can be reduced by 10-15% in the next two years. The proportion of basic, manifold and spike fertilizer is 5 to 4 to I.3 piled and rotted to return to fieldPiling organic fertilizer by useing of microorganism ferment, manures of human being and domestic animal account for 40%, straw and rice shell etc. take 40-50%, crude soil occupy 10-20%. Ferment 3 take 1%, then have piled for 20 days.Our research break through the localization that straw could not be returned directly in frigid paddyfield, and it is available that all straw returned to field in this year. Make a new method of enrich paddyfield in Heilongjiang province and frigid field.Post Graduate: Guoqiang SongMajor: Crop cultureSupervisor: Prof. Detang Zou...