新型缓释肥料在膜上灌技术中的应用

为了解决膜上灌节水技术后期肥料供应不足的问题，研制了一种新型的缓释肥料，采用正交试验研究单种玉米小畦膜上灌条件下，该缓释肥料的包裹形式、包裹肥料量等对缓释性能的影响，通过极差和方差分析得到了各因素的最优组合，即缓释肥料孔的大小为2mm、孔的数量为30个、氮磷比为2．4时，玉米产量、株高、叶面积指数和干物质累积量都最高．在灌水定额、灌水次数、肥料含量相同的条件下，该缓释肥料比正常分次穴施增产6．2％，具有一定的节肥增产效果．

Application of new slow release fertilizer in film hole irrigation

In order to solve the problem that the fertilizer is not enough in the end period of film hole irrigation,a new kind of slow release fertilizer was studied. Taking orthogonal experiment to study the effect of structure and the amount of fertilizer on slow release fertilizer＇s performance under the condition of planting maize only in the film hole irrigation. Through variance and range analysis, it can be found that the yield, height, leaf area index and dry weight of maize are good when the diameter of hole is 2mm, the number of hole is 30, the ratio between nitrogen and phosphorus is 2.4. When the amount of fertilizer, irrigation water quota and frequency are same, this kind of slow release fertilizer can increase maize yield 6.2% more than the normal ones. These show that the new kind of slow release fertilizers has some advantages in saving fertilizer and increasing yield.