Long-term Variation Of Fertilization Positioned Under Gray Desert Soil Organic Matter And Physical Properties

Agricultural practices on soil fertility, the researchers concentrated on improving the fertility of the soil chemical concern, and different fertilization systems on soil physical properties to improve the lack of research, long-term experiment by observing gray desert soil fertilization on soil physical properties dynamic effects is a blank. This study relies on national gray desert soil fertility and fertilizer effect Key Field monitoring network, the paper explore the long-term effects of different fertilization measures on the gray desert soil organic matter and physical properties, to clarify the evolution of characteristics of soil physical properties, clear time scale fertilization on soil physical affect the degree of characteristics, in order to provide the basis for the ecological effects of soil fertility and protecting farmland. On the basis of long-term fertilization experiment 22 years on, choose one of nine seasonal soil samples fertilization treatments, soil organic matter, bulk density, total porosity, saturated water content, the test field capacity moisture indicators, and basis of soil test results and data were analyzed.The results showed that, compared with CK, fertilization can increase soil organic matter and total porosity, with long-term organic manure and straw can also reduce soil bulk density, improve soil saturated water content; application of chemical fertilizer( NPK, nitrogen and phosphorus) density increased field capacity has improved trend. The larger the amount of organic fertilizer, soil organic matter to improve the effect is more obvious, 1t into organic fertilizer per acre, organic matter increased 0.27 g/kg, the average organic fertilizer organic sequestration rate of 10.2%. Straw with NPK fertilizer, can reduce soil bulk density, total porosity and field capacity increase, but to improve soil organic matter is not obvious. Fertilizer to improve the gray desert soil organic matter content is not obvious, Balanced Fertilization effects on soil organic matter to improve slightly better than the partial application of chemical fertilizer, nitrogen fertilizer for long periods of PK treatment reduced the most, which is due to increased processing PK consumption of soil nitrogen mineralization thereby increasing the organic matter, reducing the accumulation of organic matter; partial chemical fertilizers, the long-term application of NPK reduced to a minimum. Long-term decline in soil organic matter without fertilization maximum. Therefore, with the application of fertilizer and organic fertilizer to help Xinjiang gray desert soil rapid accumulation of organic matter, maintain and improve soil fertility, which for soil improvement, soil fertility, increase crop yields, improve farmland ecological environment and promoting agricultural production can be sustainable development have important theoretical and practical significance.Different growth stages of wheat, soil bulk density is not the same, the four fertility of soil bulk density and porosity are minimal jointing stage during the period, followed by a small to Oita were heading respectively, reviving, maturity. Soil bulk density increased with soil depth increases,0-40 cm layer of soil bulk density of the whole order of magnitude: CK>NK>PK>N>NP>NPK>NPKS> NPKM>1.5NPKM, fertilizing the soil bulk density can be reduced. Differences in soil porosity descending period were turning green, heading, jointing, mature, 0-40 cm soil porosity, soil each descending order of 10-20 cm, 0-10 cm, 20-30 cm, 30-40 cm. 0-40 cm total porosity of the order of 1.5NPKM, NPKS, NPKM, N, NP, NPK, NK, PK, CK.Organic fertilizer can increase the 0-40 cm soil field capacity, to improve the 0-10 cm soil layer effect maximum field capacity, and with the increase of the amount of organic fertilizer, and its effect is more obvious. Straw increased soil porosity and reduce large pores smaller, resulting in decreased soil field capacity.When 0-40 cm soil depth, organic manure and straw processing, organic matter content and bulk density has a significant linear correlation, while NPK, CK treatment no correlation. Application of organic manure, straw or fertilizer, irrigation quota can save field soil.Long-term application of organic manure or organic and inorganic fertilizer only to fertilize the soil, and can effectively improve soil organic matter, enhance soil nutrient supply capacity of crops to increase crop yields, fertilizer is the best model for sustainable development of agricultural production. Field technology is simple, and can improve the physical properties of the soil, thus improving soil structure through farmland straw, has great potential to improve and fertility. The relationship between soil fertility and the agricultural measures most closely reflect the most sensitive organic matter and soil physical properties combined with visits to guide agricultural soil fertility and agricultural production are of great theoretical and practical importance.