摘要
采用不同p H值缓冲液和土壤培养的方法研究了p H值、温度、土壤相对含水量对高分子缓/控释肥氮、磷素释放特性的影响.结果表明,酸性条件和碱性条件均能促进高分子缓/控释肥的氮、磷素释放,氮素在酸性条件下较碱性条件下快,且温度越高释放越快;磷素在不同p H值缓冲液下表现与氮素相反,碱性条件下释放更快,受温度影响不明显,表现为p H 10.0>p H 8.4>p H 5.6>p H 4.0>p H 7.0;氮素的累积释放量随时间的动态变化可用一级动力学方程Nt=No(1-e-kt)、Elvoich方程qt=a+blnt、抛物线方程qt=a+bt0.5描述,并以一级动力学方程拟合效果最好(r=0.812**—0.986**),磷素则只能用抛物线方程才能达到好的拟合效果.以土壤为介质,土壤相对含水量40%和60%时,高分子缓/控释肥氮、磷素释放量显著高于土壤相对含水量80%和100%处理,且随温度升高,氮素释放量增大,而磷素释放则无明显变化;高分子缓/控释肥的氮、磷在土壤中的释放分别用一级动力学方程、抛物线方程能达到最优描述效果.
Different p H solution and soil incubations were adopted to investigate the effect on N、P release characteristics of polymeric slow / controlled release fertilizer（ PRF） by p H、temperature and soil moisture. The results indicated that the release of N、P could be promoted by acid and alkaline solutions. Besides,N released in acid was higher than alkaline media and increased with temperature increasing. However,the release of P in the PRF was inconsistent with the N release and in the order of p H 10. 0 p H 8. 4 p H 5. 6 p H 4. 0 p H 7. 0 in solution,and not affected by temperature. N release in PRF could be quantitatively described by three equations：The first-order kinetics equation（ Nt= No（ 1- e- kt））,Elovich equation（ qt= a ＋ blnt） and parabola equation（ qt= a ＋ bt0. 5）. Besides,the imitation of the first-order kinetics equation was the best for N nutrient（ r = 0. 812＊＊—0. 986＊＊）,and parabolic equation was the best for P release. Soil as a medium,the release amount of N、P from PRF in 40% and 60% relative moisture soil was higher than that in 80% and 100% soil relative moisture. With the increasing of temperature,the amount of nitrogen release increased,and there was no significant change in phosphorus release. The release pattern of N and P from PRF in soil could be well described by the first-order kinetics equation and parabola equation,respectively.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2015年第3期484-492,共9页
Journal of Basic Science and Engineering
基金
山西省科技攻关项目(20130311009-6)
山西省研究生优秀创新项目(20123094)
关键词
高分子
缓/控释肥
养分释放特征
影响因素
polymer
slow / release fertilizer
nutrient release characteristics
influential factors
