树用长效肥研制成功树用长效肥研制成功。吉林省农科院研制的树用长效肥．利用沥青复合材料包覆尿素，通过调解复合包膜材料的比例，按树种要求控制尿素及其他无机氮和钾肥的释放速度。该肥也可用于花卉、蔬菜、瓜果类作物，特别是对一些地膜覆盖和灌水较多的作物有较好的... Tree with long-fat fertilizer successfully developed with long-fat fertilizer developed. Jilin Academy of Agricultural Sciences developed with long-term fertilizer. The use of asphalt composite material coated urea, by regulating the proportion of composite coating material, according to tree species requirements to control urea and other inorganic nitrogen and potassium release rate. The fertilizer can also be used for flowers, vegetables, fruits and crops, especially for some mulching and irrigation more crops have better ...