Root Development and Subsoil 15N-labelled N Uptake in Soybean (Glycine max (L.) Merr.)

IF 3.9 3区农林科学

Journal of Soil Science and Plant Nutrition Pub Date : 2023-10-02 DOI:10.1007/s42729-023-01482-2

Anne Porte, Sonoko D. Bellingrath-Kimura, Knut Schmidtke

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Abstract

Abstract The aim of this study was to investigate fertiliser-derived N uptake of soybean from different depths of the soil under field conditions. In addition, soybean root growth in sandy and loess soil was evaluated to understand the impact of site and soybean variety characteristics on soybean N uptake under continental conditions in Central Europe. Root analysis to determine rooting depth and root length density (RLD) was carried out using the profile wall method at three growth stages and two soybean cultivars ( Glycine max (L.) Merr. cvs. Merlin and Sultana) in three consecutive years at two locations in eastern Germany. Fertiliser-derived N uptake of soybean from the soil surface and the subsoil was determined at 0.3 and 0.6 m depths using 15 N-labelled nitrate N. Root studies showed that soybean roots grew up to 1.4 m on sandy and loess soil sites. Root length densities of up to 2.4 cm cm −3 were documented in the topsoil. By means of 15 N application, soybean was shown to take up 15% of the surface-applied nitrogen in the dry growing season and 67 % in high rainfall years, between 19 and 77 % of the nitrogen placed at 0.3 m soil depth, and between 2 and 64 % of the nitrogen placed at 0.6 m soil depth by flowering. The field trials showed that soybeans can absorb a high proportion of the nitrogen placed in the subsoil by flowering time. Due to a well-developed root system reaching deep into the soil, soybeans are able to cover their N demand from soil-borne sources and secure yield formation during dry periods by water uptake from the subsoil.

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大豆(Glycine max (L.))根系发育与土壤15n标记氮吸收稳定)。

摘要本试验旨在研究大田条件下大豆不同深度土壤对氮素的吸收。此外，本研究还评估了在沙质和黄土土壤中大豆根系生长情况，以了解在中欧大陆条件下，立地和大豆品种特征对大豆氮吸收的影响。采用剖面壁法对2个大豆品种(Glycine max (L.))在3个生育期进行根系分析，确定根系深度和根长密度(RLD)。稳定。cvs。《梅林与苏丹》连续三年在德国东部的两个地方上演。在0.3 m和0.6 m深度，利用15个N标记的硝态氮测定了大豆从土壤表层和底土中吸收的氮素。根系研究表明，在沙质和黄土土壤中，大豆根系可长至1.4 m深。表层土壤根长密度可达2.4 cm cm−3。通过施用15n，大豆在干旱生长期吸收15%的地表施氮量，在高降雨年吸收67%的地表施氮量，在0.3 m土壤深度施氮量的19%至77%之间，在0.6 m土壤深度施氮量的2%至64%之间。田间试验表明，大豆在开花时间内对底土氮素的吸收比例较高。由于发育良好的根系深入土壤，大豆能够从土壤源中满足其对氮的需求，并在干旱时期通过从底土吸收水分来确保产量的形成。

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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来源期刊

Journal of Soil Science and Plant Nutrition SOIL SCIENCE-

自引率

10.30%

发文量

331

期刊介绍： The Journal of Soil Science and Plant Nutrition is an international, peer reviewed journal devoted to publishing original research findings in the areas of soil science, plant nutrition, agriculture and environmental science. Soil sciences submissions may cover physics, chemistry, biology, microbiology, mineralogy, ecology, pedology, soil classification and amelioration. Plant nutrition and agriculture submissions may include plant production, physiology and metabolism of plants, plant ecology, diversity and sustainability of agricultural systems, organic and inorganic fertilization in relation to their impact on yields, quality of plants and ecological systems, and agroecosystems studies. Submissions covering soil degradation, environmental pollution, nature conservation, and environmental protection are also welcome. The journal considers for publication original research articles, technical notes, short communication, and reviews (both voluntary and by invitation), and letters to the editor.