不同包衣模式尿素N在基质中释放规律及对黄瓜秧苗生长的影响

为了探索包衣尿素养分释放规律和对育苗生长的影响，以普通尿素为对照，分别按等氮量设置了L30、L60和S60三种释放类型树脂包衣尿素处理并进行黄瓜穴盘基质育苗试验。在第15、21、29、36天测定了基质、肥料及幼苗中氮素含量变化情况，并在最后一天还测定了壮苗指数。结果表明：不同处理间基质中无机氮含量、幼苗吸氮量以及壮苗指数差异显著，其中L30处理氮素的释放与黄瓜幼苗吸氮趋势相吻合。幼苗株高、茎粗、单株干物重均优于CK处理，壮苗指数提高20.2%。因此，采用L30型控释氮肥，可以实现一次底肥投入，达到育苗期间免追氮肥的目标。

Study on the effects of growth of cucumber seedling raising for different kings of polythene-coated urea applied in substrate

In order to grope for the coated urea release disciplinarian and for the effect of growth of seedling raising, common urea was taken as CK, three kinds such as L30, L60 and S60 release style polythene-coated urea treatments was laid out, and according to N equality principle, the experiment of cucumber seedling raising has been carried out. The change of N content in substrate, change in polythene-coated urea and in cucumber seedlings were measured on the 15th, 21st, 29th and 36th day, and the healthy index also was measured on last day. The results showed that the Nmin content in substrate and seedlings, and seedling healthy index. are significantly different for different treatment, within that, the N release trend accords with the absorption of cucumber seedling for the treatment of L30. All the plant height, stem thickness, dry weight of single plant are remarkably higher than that of CK, and healthy index increase at 20.2%. Therefore, using L30 polythene-coated urea can realize the target of base fertilizer one times input, and avoid N top dressing, during seedling raising.