Effects Of Deep Straw Returning On Soil Biochemical Properties And Corn Yield

Soil organic matter is soil important part, is an important indicator of soil fertility, but alsothe major limiting factor in crop production. Humus is the subject of soil organic matter, animportant material basis of soil fertility. Soil enzyme activity may represent the occurrence anddevelopment of soil, soil fertility formation and other processes. In this study, the influence ofdifferent levels of the surrounding soil on corn stalks and roots decomposing though indoorexperiment is studied, the influence of humus each component soil organic carbon and soilenzyme activity on different depth and the amount of straw through in-stiu deperiment is studied.the influence of humus each component soil organic carbon and soil enzyme activity ondifferent depth and the amount of straw with cultivation methods in field deperiment is studied.The results were as follows:(1) In the Ji Lin Agricultural University field practice the same amount of straw returningdifferent depth processing, Research the effects of humus component soil organic carbon andsoil enzyme activity with different returning depth. Through two years of research shows: thenumber of accumulated soil humus in the soil depth showed the highest content of0~15cm.TOC and humus content with the amount of straw was an increasing trend,△L ogK valueshaveincreased, N、K element content increases. Experimental study in2012showed that the cornthroughout the growing period, soil catalase activity showed an increasing trend, soil ureaseactivity showed a decreasing trend, soil enzyme activities high than those without straw.2013trial showed that straw, soil catalase and invertase activity increased, decreased soil ureaseactivity.(2) Under field conditions after three cultivated black soil (0~20,20~40,40~60cm)added4%and8%higher amount of corn stalks in situ nylon bag for4years, and the straw intothe soil at different levels organic carbon accumulation characteristics and changes in thecomponents of humus and soil enzyme activities. The results showed that the addition of4%ofthe amount of straw at0~20,20~40,40~60cm soil organic carbon increased by31.8%,96.4%and171.1%,8%of the amount of straw increased the amount of straw added86.2%,193.5%and265.9%, increase in the depth of straw conducive to the accumulation of soilorganic carbon.0~20cm soil conditions in the absence of organic carbon Straw declined29.3%,while the20~40cm soil layer decreased by only1.8%. Soil organic carbon and activity wereimproved with the addition of straw increased humus HA/FA ratio changed greatly improve the quality of humus. Soil organic carbon and activity were improved with the addition of strawincreased humus HA/FA ratio changed greatly improve the quality of humus. Each treatmenthumic carbon content (HS-C) and the carbon content of humic acid (HA-C) size of20~40cm>0~20cm>40~60cm, and40~60cm soil is more conducive to fulvic accumulation of acidcarbon content (FA-C). HA-C, FA-C content and soil catalase activity was significantlypositively correlated with urease, invertase activity was a significant positive correlation. Theresults of the deep straw promote the accumulation of soil organic matter provide a theoreticalbasis.(3) Using nylon bag incubation test, study the adding different organic materials on theinfluence of different soil structure. Corn stalks and corn stalks block segment accumulateddecomposing rate reached77.7%,62.6%, respectively decomposing rate is1.11g·g-1·a-1,0.89g·g-1·a-1. Compared with no addition of an organic material handling, are each processed withincreasing distance from the center rod straw the pH value was decreased, the same tendency ofsoil organic matter.(4) Adopts two lines of the three ridge planting method, field for high amount strawreturned, study the influence of different returning straw to humus component soil organiccarbon and soil enzyme activity. Compare without straw, plus soil weight0.44%,0.88%,1.32%of straw soil organic carbon increased14.2%,21.8%,32.0%.and with the increase of the amountto field, TOC was increased. plus soil weight1.32%of straw soil catalase urease and invertaseactivity significantly increased.