氮肥不同基肥、追肥比例对小白菜硝酸盐含量及氮肥利用率的影响

Effects of Different Ratios of Base N to Dress N Fertilizer on Nitrate Content in Chinese Cabbage and the N Use Efficiency

通过盆栽试验,研究了同等氮量,不同基肥、追肥比例对小白菜产量、硝酸盐含量以及氮肥利用率的影响。结果表明:小白菜产量以追肥质量比为75%的处理(N4)最高,全部用作基肥的处理(N1)最低,依次为N4>N2>N3>N1;50%氮肥作追肥的处理(N3)硝酸盐含量最高,75%氮肥作追肥的处理(N4)硝酸盐含量最低,依次为N3>N1>N2>N4 ;氮肥利用率随追肥质量比增加而增加,其中N4的利用率比N1 高出9.94%,差异达到显著水平。同等氮量条件下,以N4的基肥、追肥质量比最佳。

Pot experiments were carried out to study the effect of different ratios of base N fertilizer to additional N fertilizer on the yield, nitrate content of Chinese cabbage and the N use efficiency (NUE) with invariable amount of N fertilizer. The results showed that the fresh weights in the treatments were N4>N2>N3>N1. Treatment N4 gave the highest crop yield, in which N fertilizer was used mostly (75 %) as dress fertilizer. The lowest yield was observed when all N fertilizer was used as base fertilizer in Treatment N1. The crop had the highest nitrate content in Treatment N3, in which half of N fertilizer was used as dressing, while the lowest one occurred in Treatment N4. The nitrate content of the treatments were in the following order: N3>N1>N2>N4. The NUE was increased with the increment of dress fertilizer rate. And Treatment N4 had a significant higher (9.94 %) NUE than Treatment N1. In a word, the optimum ratio of base N fertilizer to dress N fertilizer was Treatment N4 among the treatments.