粳稻采前施氮对籽粒作物形态发生的响应

IF 6.4 1区农林科学 Q1 AGRONOMY

Field Crops Research Pub Date : 2025-02-25 DOI:10.1016/j.fcr.2025.109809

Weiyi Xie, Yuji Yamasaki, Yoichiro Kato

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引用次数: 0

摘要

主要作物灌浆期施氮可提高再生稻产量。然而，对采前氮素管理对再生作物形态发育的影响并没有很好的文献记载。目的推测主粮灌浆过程中植物氮素营养介导了分蘖和穗部的形态发生。我们的目的是阐明收获前氮促进再生作物生长的形态学特征。方法采用2年对照试验，在主要作物抽穗后5 d施氮和不施氮60 kg hm - 1。利用割茬法测定了分蘖芽和各节幼穗的长度。Logistic函数模拟了模型的发展动态。结果采前施氮可通过增强再生能力提高再生作物产量。它还能提前分蘖生长的开始，缩短上节分蘖芽和幼穗的发育周期。相比之下，低节位的再生能力和再生作物生长不受影响。结论采前施氮提高再生作物产量是由于再生发育提前和上部节点再生能力增强所致。本研究为冬稻收获前施氮的重要性提供了科学依据。我们的研究结果将有助于改善水稻-水稻系统的氮素管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Morphogenesis of ratoon crops in response to preharvest nitrogen application in japonica rice

Context

Nitrogen (N) application during grain filling of the main crop increases yield of ratoon rice. However, the morphological development of ratoon crops in response to preharvest N management is not well documented.

Objective

We hypothesized that plant N nutrition during grain filling of the main crop mediates the morphogenesis of ratoon tillers and panicles. Our objective was to elucidate the morphological characteristics by which preharvest N promotes ratoon crop growth.

Methods

Two N treatments were compared in a lowland rice field for 2 years: with or without 60 kg N ha^–1 applied at 5 days after heading of the main crop. The lengths of the tiller buds and young panicles at each node of the ratoon crop were monitored by dissecting the stubble. Logistic functions simulated the ratoon development dynamics.

Results

Preharvest N application increased ratoon crop yield by enhancing ratooning ability. It also advanced the onset of ratoon tiller growth and shortened the development period of tiller buds and young panicles at the upper nodes. In contrast, ratooning ability and ratoon crop growth at lower nodes were not affected.

Conclusion

Increased ratoon crop yield after preharvest N application resulted from advanced ratoon development and enhanced ratooning ability at the upper nodes.

Implications

This study provides scientific support for the importance of preharvest N application in ratoon rice cultivation. Our findings will contribute to improvement of N management in riceratoon-rice systems.

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来源期刊

Field Crops Research 农林科学-农艺学

CiteScore

9.60

自引率

12.10%

发文量

307

审稿时长

46 days

期刊介绍： Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.