Regulation of maize growth, nutrient accumulation and remobilization in relation to yield formation under strip-till system

IF 2.3 4区农林科学 Q1 AGRONOMY

Archives of Agronomy and Soil Science Pub Date : 2023-01-19 DOI:10.1080/03650340.2023.2169281

Ye Sha, Z. Hao, Zheng Liu, Yiwen Huang, G. Feng, Fanjun Chen, G. Mi

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引用次数: 1

Abstract

ABSTRACT A two-year field experiment was conducted to elucidate the adaptive growth mechanism of maize under strip-till (ST) compared with conventional-till (CT). The biomass accumulation of ST plants was significantly lower than CT until V14 (14th leaf), but restored thereafter with one below-ear-node leaf reduced. At silking, the accumulation of nitrogen (N) was reduced by 8.3–10.7% compared to CT. During post-silking, vegetative-N remobilization was reduced by 20.4%, post-silking N uptake increased by 33.9% in ST compared to CT. Leaf senescence was delayed and more green leaf area at physiological maturity in ST. It is concluded that ST plants have the mechanism of ‘Recovery Growth Adaptation’ to get the similar yield as in CT plants: (1) facilitating growth rate at around V14 when the soil temperature was greatly improved to stabilize ear growth and grain number; (2) getting to silking the same time as in CT plants, so as to ensure the duration of grain filling; (3) increasing post-silking N uptake to fulfill the demand of grain development and reduce leaf N remobilization, so as to maintain leaf function and increase thousand-grain weight, which compensate for the loss of grain number per ear.

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带状耕作制度下玉米生长、养分积累和再动员与产量形成的关系

摘要通过为期2年的田间试验，研究玉米条带耕作(ST)与常规耕作(CT)的适应性生长机制。在V14(第14叶)之前，ST植株的生物量积累显著低于CT，但在V14(第14叶)之后恢复，穗节下叶减少1片。吐丝时氮素积累量较对照降低8.3 ~ 10.7%。在吐丝后，与CT相比，施洗组的氮素再动员减少了20.4%，施洗组的氮素吸收增加了33.9%。生理成熟时，ST植株叶片衰老延迟，绿叶面积增大，表明ST植株具有“恢复生长适应”机制，可获得与CT相近的产量:(1)促进V14左右的生长速度，此时土壤温度大幅提高，稳定穗长和粒数;(2)与CT植株同步吐丝，保证灌浆时间;(3)增加吐丝后氮素吸收，满足籽粒发育需要，减少叶片氮素再动员，维持叶片功能，增加千粒重，弥补穗粒数的损失。

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来源期刊

Archives of Agronomy and Soil Science AGRONOMY-SOIL SCIENCE

CiteScore

5.50

自引率

4.20%

发文量

107

期刊介绍： rchives of Agronomy and Soil Science is a well-established journal that has been in publication for over fifty years. The Journal publishes papers over the entire range of agronomy and soil science. Manuscripts involved in developing and testing hypotheses to understand casual relationships in the following areas: plant nutrition fertilizers manure soil tillage soil biotechnology and ecophysiology amelioration irrigation and drainage plant production on arable and grass land agroclimatology landscape formation and environmental management in rural regions management of natural and created wetland ecosystems bio-geochemical processes soil-plant-microbe interactions and rhizosphere processes soil morphology, classification, monitoring, heterogeneity and scales reuse of waste waters and biosolids of agri-industrial origin in soil are especially encouraged. As well as original contributions, the Journal also publishes current reviews.