摘要
利用盆栽试验,研究了不同氮素用量对大白菜早熟5号生物量,植株氮、磷、钾质量分数及积累量的影响。试验结果表明,生长期,地上部单株鲜、干质量均成倍增大,N3处理的鲜、干质量均为最大值,但至收获期,单株鲜、干质量,氮、磷、钾质量分数和积累量在不同处理间的差异并不显著,鲜质量介于41.0~49.8 g/株,氮、磷、钾质量分数分别为25.5~26.4,3.4~3.6,27.1~29.2 mg/g,氮、磷、钾积累量分别介于61.6~66.8,8.3~9.1,66.2~73.8 mg/株;随着施氮量的增加,氮肥农艺利用率和氮素吸收效率均显著降低。因此,在大白菜生产中以N3处理(2.0 g/盆)的纯氮用量(理论N素83.4 kg/hm^2)为宜。
Carrying out a pot experiments,we studied the effects of different N levels on biomass,accumulation of N,P,K in leaves of Chinese cabbage cultivar Zaoshu No.5.The results showed that both fresh and dry weight of the overground part increased exponentially,and the highest level was found in N_3 treatment during the growing period,however,there had no significant differences among different treatments at the harvest time.For all treatments,fresh weight in harvest time was between 41.0-49.8 g/plant,and mass fraction of N,P,K were 25.5-26.4,3.4-3.6,27.1-29.2 mg/g,while the accumulation of N,P,K were 61.6-66.8,8.3-9.1,66.2-73.8 mg/plant,respectively.With the increase of N level,the agronomic efficiency and uptake efficiency of N fertilizer decreased significantly.Therefore,the N_3 treatment,with the amount of pure nitrogen was 2.0 g/basin(theoretical N amount of 83.4 kg/hm^2),was appropriate for Chinese cabbage.
出处
《长江蔬菜》
2016年第12期77-80,共4页
Journal of Changjiang Vegetables
基金
浙江省重大科技专项(2011C02001)
关键词
大白菜
氮
磷
钾
积累
生物量
Chinese cabbage
N
P
K
accumulation
Biomass