| For the current agricultural production emergence of "white pollution" problem,in order to effectively address the problem of pollution film residue, rational use of covered cultivation,In this study, by two factors Weibei Highland randomized block experimental design,set the growth period, fallow period and annual period to cover biodegradable film, liquid film and ordinary plastic film, mulching treatment on winter wheat in different soil moisture 0-200cm of space-time distribution of soil nutrients, growth, yield and water use efficiency of two consecutive years, the main conclusions were as follows:1. Three kinds of film Mulch is with better soil moisture conservation effect, which can regulate soil moisture space-time distribution. Different treatments at different growth stages of winter wheat, soil water content have the same spatial trend: 0-40cm soil layers influenced seriously by rainfall, from jointing to filling, 140-160cm soil water content is lowest, and 60-100cm is highest, because of rain, the peak of maturity occurred in the soil surface.2. Covering different types of plastic film fallow treatment quite different soil moisture before sowing, XS and XD soil water content was significantly higher than XY and CK, from sowing to winter, XS and XD water consumption was significantly higher than XY and CK. Fallow cover biodegradable film, and ordinary film can effectively improve soil moisture before sowing winter wheat condition, for winter wheat emergence and seedling water uptake, is conducive to the formation of seedling, different types of plastic film covering the annual soil water content changes with time and leisure of coverage under the basic agreement. Growth period covering biodegradable film, ordinary plastic film and liquid film processing for two consecutive years on average in the 0-200cm soil water content than the CK in the filling stage, respectively 5.7%, 6.5%, 5.2% and 7.0%, 4.1%, 9.3%;2008-2009 years, the fallow period covered biodegradable film, plastic film and liquid film ordinary soil water content than the CK in the filling stage, respectively increased by 6.6%, 13.0% and 1.1%; throughout the year covering biodegradable film, plastic film and liquid film normal soil moisture in the filling CK respectively increased by 6.1%, 6.9% and 6.6%, the mulching treatment increased soil moisture for grain filling stage and yield of winter wheat grain filling critical.3. Different types of mulching the soil nutrients can affect some topsoil, Three types of plastic film covering different periods of treatment are covered biodegradable film absorption and utilization of winter wheat on the highest organic matter, reduce the rate of organic matter content than CK 5.7%~15.9% (P<0.05); 0-20cm soil fertility of three different types of plastic film covering more leisure and annual coverage of the high organic matter uptake, 20-40cm and 40-60cm soil covering different periods of treatment no significant difference between the organic matter content. After the 2008 harvest, 0-60cm soil layer TN, TP and TK content was the lowest SM, TN less than CK 8.5%～9.5%,TP less than CK 3.2%～12.8%,TK less than CK 12.9%～23.4%;After the 2009 harvest, covering different periods of handling three different types of film the whole winter 0-60cm soil TN and TP uptake were highest in the treatment of biodegradable mulch film coverage, TN less than CK 11.5%～30.0%,TP less than CK 3.0%～10.2%,film of the 0-60cm layer of soil TK content was not influenced. Coverage can improve the soil of winter wheat on the 0-60cm soil available nutrient absorption. After the 2008 harvest, each post-harvest 0-60cm layer of soil nitrogen, available phosphorus were lowest processing SM, nitrogen content less than CK 8.1%～15.5%,available phosphorus content less than CK 11.3%～22.9% The different layers of soils, the minimum treatment are DM, respectively, less than CK 10.4%~18.7%.After the 2009 harvest, ordinary plastic film mulching on soil under winter wheat nitrogen and potassium uptake higher, as for the use of available phosphorus, biodegradable film covering effects.4. Cover different types of plastic film can effectively promote the growth of winter wheat, conducive to plant height at different growth stages of winter wheat and dry matter accumulation increased. Treatment throughout the year covering various growth stages of winter wheat plant height and dry matter accumulation were both significantly higher than the growth period of cover and leisure coverage in the treatment, one year biodegradable film covering at each growth stage of winter wheat plant height and dry matter accumulation were both significantly higher than other treatments; Coverage of winter wheat growing period plant height and dry matter accumulation was significantly higher than the fallow period covered(P<0.05);under three different liquid film covering the period covered by wheat plant height and dry matter accumulation were both significantly lower than the biodegradable film and common plastic film, with no significant difference CK, biodegradable film and plastic film mulching were significantly higher than CK(P<0.05).5. Different types of plastic film mulching on yield components of winter wheat are not consistent, the mulching treatment and compared to the control, into the ears and grains per spike significantly different, ordinary plastic film covering the year in which treatment was significantly higher than other coated and the control, the impact of coverage on the grain weight was not significant (P<0.05).6. Two consecutive years, covering different types of plastic films on winter wheat yield results showed that: annual yield of each treatment under the coverage of the sharpest, to biodegradable film and the general film processing yield was significantly higher than the liquid film and the control (P<0.05), yield respectively over CK 35.99% and 30.46%. Growth period covering general film, biodegradable film and increase yield no significant difference, yield increase for two consecutive years were 6.45% and 7.52%, 28.95% and 22.44%;fallow cover biodegradable film and plastic film compared with CK increased 25.04% and 20.54%;covering general Film biodegradable film and no significant difference in yield, but in the end of the lower soil moisture, uneven distribution of rainfall years (2008-2009years), biodegradable film covering yield more obvious effect of increasing yield of liquid film is relatively small.7. Film processing of all water use efficiency were higher than CK, moisture in the lower end, the uneven distribution of rainfall years (2008-2009 years) covering the handling advantages of biodegradable film is more obvious, different times in three different types of mulching treatment than under the coverage of fertility treatments on water use efficiency, growth period covering biodegradable film to improve water use efficiency to 34.32%.8. Different types of plastic film covering water gathering effect of winter wheat, nutrient change, growth and development process and the yield and water use efficiency comparative analysis indicates that biodegradable film and the general production of plastic film covering two consecutive years was no significant difference, ordinary plastic film mulching on winter wheat growth and development to promote the role of the largest, and degradation of film properties under the coverage of water and nutrient use efficiency, all shows that biodegradable film can replace the normal application of film in production, and can effectively solve the "white pollution" problem. However, biodegradable plastic film production costs than conventional plastic film 1/ 3, so that large area affected. Further reduce the biodegradable film's production costs would be effective to solve common technical way mulching. Liquid film sprayed on the soil surface, vulnerable to external environmental conditions and damage to its main physiological effects of reduced.
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