Effects Of Reduced Application Of Controlled-releasc Bulk Blend Fertilizer On Wheat Growth And Soil Nutrient And Use Efficiency

Low fertilizer use efficiency, poor economic performance and a serious environmentalimpact has become urgent to solve agricultural production problems, but the development ofcontrolled-release bulk blend fertilizer is an effective way to solve the above problem, itsapplication will take into account the economic benefits of fertilizer, ecological and socialbenefits and promote the development of agriculture to high and stable yield and qualitydirection. This field experiment and indoor chemical analyses were conducted to effects oflower fertilizer of bulk blend fertilizer on wheat growth and soil nutrient and fertilizer useefficiency. The results can provide theoretical supports for the application ofcontrolled-release bulk blend fertilizer and the development of sustainable agriculture. Mainresults were summarized as follows:1. The wheat growth traits of decreasing application of the controlled-release bulk blendfertilizer at different growth stages were no significant differences, compared with the highfertilizer levels; they could keep the similar growth traits of wheat.2. Reduced application of the controlled-release bulk blend fertilizer were not affect thevalidity of the N, P and K; When reducing application by20%in amount of fertilizer, soilNO3--N, NH4+-N and total N could preserve76%-91%,70%-84%,80%-98%of the wholeapplication of the controlled-release bulk blend fertilizer; When reducing application by50%in amount of fertilizer, soil NO3--N, NH4+-N and total N could preserve55%-73%,50%-62%,79%-98%. After the jointing stage of wheat, controlled release of nitrogen was alsoeffective in promoting the top soil phosphorus, potassium availability, was able to ensure thewheat growing demand.3. Compared with the full fertilizer levels of controlled-release blended fertilizer,reducing the application reduced the amount of the downward movement of soil nutrients tothe soil underlying, When reducing application by20%in amount of fertilizer, the maximumreduction soil bottom section NO3--N, NH4+-N and total N were40%,23%and45%，the maximum reduction available phosphorus and available potassium were26%and64%; Whenreducing application by50%in amount of fertilizer, the maximum reduction soil bottomsection NO3--N, NH4+-N and total N were51%,35%and59%，the maximum reductionavailable phosphorus and available potassium were55%and36%.4. Compared with the full fertilizer levels of controlled-release blended fertilizer, in2009and2010, the wheat yield reduction were6.2%and6.3%when reducing application by20%in amount of fertilizer，the wheat yield reduction were8.1%and8.3%when reducingapplication by50%in amount of fertilizer, fertilizer use efficiency were improved to varyingdegrees. There is a suggestion that the controlled-release bulk blend fertilizer can reduce theapplication rate, and it can improve the fertilizer use efficiency and does not significantlyaffect wheat yield.