摘要
在实验室条件下,采用简化的工艺制备了对氮、磷、钾三元素均有部分缓释作用的复混肥(化学缓释肥),用特定淋洗装置测定肥料各养分随时间的溶出率,通过双曲线方程Xt=b-a/t对其养分累计溶出率与时间的关系进行拟合,以方程常数b和a计算出的缓释指数(SR I)来定量评价肥料缓释特性,同时进行盆栽试验,探讨了缓释指数与复混肥中相应缓释添加剂百分含量(X)之间、各复混肥处理的油菜产量与复混肥中缓释添加剂总含量(X')之间的关系。结果表明:各养分的缓释指数(SR I)与相应缓释添加剂含量(X)均有很好的线性正相关;各化学缓释肥处理的油菜产量随缓释添加剂总含量(X')增加而增加;化学缓释肥以较少的荚数获得更高的产量。这预示着通过肥料的室内淋洗试验得到的缓释指数SR I不仅可以用来评价肥料的缓释性能,且在一定程度上可预测肥料的增产效应。
The slow -release compound fertilizer (NPK -SF) was prepared by simplified chemical method in laboratory in which nitrogen, phosphorus and potassium could be partly slow -released. The dissolving percentage of N, P and K in NPK -SF and control fertilizer (CK) was measured under the specified leaching apparatus. Hyperbolic curve equation ( Xt = b - a/t) was used to fit the accumulated nutrient dissolving percentage and the slow - release index (SRI) calculated from b and a values of the equation was used to evaluate the nutrients slow release properties of NPK - SF quantitatively. At the same time, pot experiments of the fertilizer on rapeseed were conducted. The relationship between SRI and additive content (X) of each nutrient in the NPK -SF, yield of rapeseed and total additive content (X′) was analysed. The result showed : SRI had good liner positive correlation with additive content (X) of corresponding nutrient in the NPK - SF. The yield increased as total additive content (X′) increased and the higher yield of p - NPK - SF was obtained with less number of pod compared to p - CK. This indicated that the SRI could not only be used to evaluate of the slow - release properties of slow - release compound fertilizer and predict the additive content in the fertilizer, but it could also be used to predict the increment of yield in certain range.
出处
《土壤通报》
CAS
CSCD
北大核心
2006年第3期513-518,共6页
Chinese Journal of Soil Science
基金
湖北省重点科技资助项目(98190706)
关键词
化学缓释肥
养分溶出率
双曲线方程
缓释指数
盆栽试验
Chemical slow - release compound fertilizer
Nutrient dissolving percentage
Hyperbolic curve equation
Slow- release index (SRI)
Pot experiments