Effect of different soil environmental factors on N release rate of compound modified mineral coated urea

WU Yong-long1,2,DU Jian-jun2,WANG Yi-quan1,TIAN Ji-lin3,ZHU Hai-tao3 (1 College of Resources and Environment,Northwest A & F University,Yangling,Shaanxi 712100,China;2 Lab of Plant Nutrition and New Fertilizer,Zhongkai University of Agriculture and Technology,Guangzhou,Guangdong 510225,China;3 Environmental Science Institute,Shanghai Academy of Agricultural Sciences,Shanghai,201106,China)

compound-modified-mineral-coated urea;soil environmental factors;N release

A simulated experiment with four different soil environmental factors(water content,temperature,texture and microorganism) was carried out to study the effect of those factors on N release of three compound-modified-mineral-coated urea(CMMCU,M,L and H).The results indicated that the effects of soil texture and 35%-100% soil water content of field moisture capacity on N release of CMMCUs were not significant,which showed that soil water condition and soil texture were not the main factors influencing on N release of CMMCUs.However,soil temperature and soil microorganism had significant influence on N release of the fertilizer.Under same soil water content,N released rate increased by 27.65%,10.16% and 20.32% with soil temperature increasing from 25 ℃ to 35 ℃,respectively.N released rate in sterilized soil was decreased by 43.28%,45.16% and 28.27% compared with that in CK,respectively.Therefore,soil microorganism and its activity obviously influenced N release of CMMCUs under suitable soil water and temperature conditions.