缓控释肥料在不同介质中的养分释放特性及其肥效

采用水浸法和土壤培养法测定了4种缓控释肥料（CRF1、CRF2、SCU、IBDU）的养分释放特性，并通过盆栽试验评价了缓控释肥料养分释放特性与油菜需肥规律的吻合性.结果表明：CRF1和CRF2在水中的释放曲线为“S”型，SCU为“破裂式释放”，IBDU的释放曲线呈倒“L”型;4种缓控释肥料在水浸法和土壤培养法中的养分释放特性均可用二项式方程进行拟合，说明两种方法存在一定的相关性.CRF1、CRF2两处理的油菜养分吸收量和生物量显著高于其他处理，以CRF2处理为最高，并且CRF1、CRF2的养分释放特性更接近油菜的需肥规律.

Nutrient release characteristics and use efficiency of slow- and controlled release fertilizers.

Water extraction method and soil incubation method were used to study the nutrient release characteristics of four slow- and controlled release fertilizers (CRF1, CRF2, SCU, and IBDU), and pot experiment was conducted to assess the effects of the release characteristics on the nutrient requirements of canola (Brassica napus L.). The nutrient release curves of test fertilizers in water were S pattern for CRF1 and CRF2, burst pattern for SCU, and reverse L pattern for IBDU. The nutrient release characteristics of the four fertilizers in water and in soil all fitted binomial equations, suggesting that there existed some similarities in the nutrient release in the two media. The nutrient uptake and biomass of canola plants treated with CRF1 and CRF2 were significantly higher than those treated with SCU and IBDU, and CRF2 had the greatest effect. The nutrient release curves of CRF1 and CRF2 accorded more closely with the nutrient requirements of canola.