4种不同材料包膜尿素对油菜的生长效应

Evaluation of the effect of coated urea on rape growth

通过盆栽试验研究了自制的4种不同材料包膜尿素对油菜生长效应及品质效应的影响,重点从土壤脲酶活性、油菜产量、品质及肥料利用率等方面对不同包膜肥料进行了评价。选出了一种控释效果较好的包膜肥FSU-4,其一次施用能满足油菜整个生育时期对养分的需求,使油菜生物产量比施用尿素提高70.8%,Vc含量提高7.8%,叶绿素含量提高46.1%,而硝酸盐含量则下降46.0%。施用包膜肥FSU-4比施用尿素N肥利用率提高36%,可有效减少N的损失。研究表明,在油菜生长前期包膜肥对脲酶有抑制,后期则有促进作用,其机理有待进一步深入研究。

A pot experiment was set up to study the effects of four different coated urea fertilizers on rape growth through appraising their impact on soil urease activity,yield and quality of rape and fertilizer utilization rate.Based on the above mentioned indices,the best treatment（FSU-4） was selected that fully met rape nutrition demand just from single application.Compared with urea treatment,rape biomass raises by 70.8%,Vc content increases by 7.8%,and chlorophyll content increases by 46.1% when treated with FSU4;while nitrate content drops by 46.0%.In two experiments conducted,fertilizer utilization rate of FSU-4 increases by 36% compared with urea.Suppression of urease activity by coated urea is observed in the early rape growth stage,but subsequently gains vigor in the late stage;an unexplained phenomenon that needs further research.