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首页> 外文期刊>European Journal of Agronomy >Attainable yield achieved for plastic film-mulched maize in response to nitrogen deficit.
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Attainable yield achieved for plastic film-mulched maize in response to nitrogen deficit.

机译：响应氮缺乏的塑料膜覆盖玉米可达到的产量。

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摘要

Nitrogen (N) stress limits the yields of maize (Zea mays L.) that have been plastic film-mulched in northwest China. Using the tested Hybrid-Maize simulation model, which was combined with field experiments using four levels of N fertilisers (0, 100, 250 and 400 kg N ha-1), we aimed to understand the variability of the attainable yield in response to N stress under plastic film mulching. We show that the application of N250 or N400 results in 100% simulated potential LAI, which is, thus, close to 100% of the simulated potential of both biomass and grain yield. However, N stress treatments significantly decreased the biomass and grain yields, achieving only 40-50% of the simulated potential (N0 treatment) and 70-80% of the simulated potential (N100 treatment). Growth dynamic measurements showed that N stress significantly decreased the LAI, delaying the source capacity growth (canopies) around the silking stage and resulting in lower final kernel numbers. The lower LAI resulted in decreased dry matter accumulation and allocation during the reproductive stage; this decrease led to a decrease in the kernel growth rate and in the grain filling duration, which resulted in a significantly lower kernel weight. This knowledge could be helpful for the optimisation of N management to close the yield gaps of dryland maize in semi-arid monsoon climate regions.
机译：氮（N）胁迫限制了在中国西北地区进行塑料薄膜覆盖的玉米（Zea mays L.）的产量。使用经过测试的杂交玉米模拟模型，并与使用四种水平的氮肥（0、100、250和400 kg N ha -1 ）的田间试验相结合，我们旨在了解玉米的变异性。地膜覆盖下响应N胁迫可获得的产量。我们表明，N250或N400的应用可产生100％的模拟电位LAI，因此接近生物质和谷物产量的模拟电位的100％。但是，N胁迫处理显着降低了生物量和谷物产量，仅达到了模拟电位的40-50％（N0处理）和70-80％的模拟电位（N100处理）。生长动态测量结果表明，N胁迫显着降低了LAI，延缓了蚕丝阶段的源能力增长（冠层），并导致较低的最终籽粒数。 LAI降低导致生殖阶段干物质积累和分配减少;这种减少导致籽粒生长速率和籽粒灌浆持续时间的降低，从而导致籽粒重量显着降低。该知识可能有助于优化氮肥管理，以弥合半干旱季风气候区旱地玉米的产量缺口。

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