纳米膨润土包膜尿素对小白菜生长及氮肥利用率的影响

Effects of nano-bentonite coated urea on growth and nitrogen use efficiency of cabbage

采用土培试验,研究了纳米膨润土包膜尿素对小白菜产量、养分累积量、氮肥利用率、叶片叶绿素含量及部分品质指标的影响。结果表明:纳米膨润土包膜尿素可极显著的提高小白菜的产量,并可提高N、P、K养分累积量和氮肥利用率;与施用纯尿素处理相比,施用15%纳米膨润土包膜尿素,减氮肥用量10%和20%的处理,氮肥利用率分别提高了7.9%、8.3%;施用20%纳米膨润土包膜尿素,减氮肥用量10%和20%的处理,氮肥利用率分别提高了3.6%、12.6%;所有氮肥处理的小白菜的叶绿素含量均比不施氮肥处理高,且达到极显著水平,施用纳米膨润土包膜尿素处理比纯尿素处理有所增加,但差异不显著;与施用纯尿素相比,施用纳米膨润土包膜尿素对维生素C含量影响差异不显著,硝酸盐含量显著上升,可溶性糖含量显著增加。

A soil pot experiment was taken to study the effects of Nano- bentonit coated urea on the yield, nutrient absorption, nitrogen fertilizer use efficiency, leaf chlorophyll content and quality indexes of cabbage. The results showed that nano-bentonit coated urea could significantly improve the yield of cabbage and the accumulation of nutrients, so as the nitrogen use efficiency. Comparing with pure urea, the treatments applied 15% nano-bentonit coated urea while the content of nitrogen decreased about 10% and 20%, the nitrogen use efficiency has als0 been respectively improved about 7.9%, 8.3%; the treatments applied 20% nano-bentonit coated urea while the content of nitrogen decreased about 10% and 20%, the nitrogen use efficiency respectively improved about 3.6%, 12.6%. The cabbage chlorophyll content of all the nitrogen treatments are significantly higher than that of the non-nitrogen treatments, and cabbage chlorophyll content in the treatments applied nano-bentonite coated urea was higher than that in the treatment applied conventional urea, but the difference was not significant.