当前位置: X-MOL 学术Field Crops Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Plastic film mulching affects the critical nitrogen dilution curve of drip-irrigated maize
Field Crops Research ( IF 5.8 ) Pub Date : 2021-01-12 , DOI: 10.1016/j.fcr.2021.108055
Lifeng Zhou , Hao Feng , Wenzhi Zhao

Critical nitrogen dilution curves (CNDC) can efficiently diagnose nitrogen (N) condition of crops. Unfortunately, no CNDC exits for mulched drip-irrigated crops. Here we determine the CNDCs of drip-irrigated maize (Zea mays L.) with and without plastic mulch and investigate effects of plastic mulch on soil NO3-N concentration in root zone (Nsoil), maize morphology, and CNDC changes. Aboveground dry biomass (DM), crop N concentration, soil N concentration, and related morphological characteristics of maize were measured in Northwest China under five N application rates with and without plastic mulch to calculate critical N concentration (Nc) and develop CNDCs. Plastic film mulching decreased Nsoil by 16.5 % and increased DM by 25.9 %. Mulching increased DM more than root growth and resulted in a lower root to shoot ratio compared with that of no mulching. Plastic film mulching affected CNDC and grain yields by increasing DM, thus lowering root to shoot ratio. CNDCs were Nc = 3.58DM−0.36 [R2 = 0.98] for drip-irrigated maize and Nc = 4.17DM−0.35 [R2 = 0.94] for mulched drip-irrigated maize. Mulching lowered nitrogen nutrition index at silking stage and increased it at physiological maturity stage. These results indicate that CNDC can be used to correctly determine N application rates for mulched drip-irrigated maize production.



中文翻译:

地膜覆盖对滴灌玉米氮临界稀释曲线的影响

关键的氮稀释曲线(CNDC)可以有效地诊断农作物的氮(N)状况。不幸的是,没有覆盖的滴灌作物的CNDC出口。在这里,我们确定了有和没有塑料覆盖的滴灌玉米(Zea mays L.)的CNDC,并研究了塑料覆盖对根区(N土壤)土壤NO 3 -- N浓度,玉米形态和CNDC变化的影响。在有和没有塑料覆盖的情况下,在五种氮肥施用量下,测量了西北地区地上干生物量(DM),作物氮含量,土壤氮含量以及相关的玉米形态学特征,以计算临界氮浓度(Nc)并建立了CNDC。地膜覆盖减少了N增加16.5%,增加DM 25.9%。与不覆盖相比,覆盖增加的DM多于根生长,并且导致较低的根与茎比率。地膜覆盖会通过增加DM来影响CNDC和谷物产量,从而降低根冠比。滴灌玉米的CNDC为Nc = 3.58DM -0.36 [R 2 = 0.98],而覆膜滴灌玉米的Nc = 4.17DM -0.35 [R 2 = 0.94]。覆盖期降低了蚕丝期的氮素营养指数,而在生理成熟期则提高了氮素营养指数。这些结果表明,CNDC可用于正确确定覆盖灌溉灌溉玉米生产中的氮肥施用量。

更新日期:2021-01-12
down
wechat
bug