New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.

The differences in rhizosphere nitrification activities between high- and low- fertility soils appear to be related to differences in dissolved oxygen concentrations in the soil, implying a relationship to differences in the radial oxygen loss (ROL) of rice roots in these soils. A miniaturised Clark...

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Autores principales:	Yilin Li, Weiming Shi, Xingxiang Wang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f2c02a4a7f5b4a7ab3fae3f678c4cca7
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spelling	oai:doaj.org-article:f2c02a4a7f5b4a7ab3fae3f678c4cca72021-11-25T05:57:37ZNew insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.1932-620310.1371/journal.pone.0109161https://doaj.org/article/f2c02a4a7f5b4a7ab3fae3f678c4cca72014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0109161https://doaj.org/toc/1932-6203The differences in rhizosphere nitrification activities between high- and low- fertility soils appear to be related to differences in dissolved oxygen concentrations in the soil, implying a relationship to differences in the radial oxygen loss (ROL) of rice roots in these soils. A miniaturised Clark-type oxygen microelectrode system was used to determine rice root ROL and the rhizosphere oxygen profile, and rhizosphere nitrification activity was studied using a short-term nitrification activity assay. Rice planting significantly altered the oxygen cycling in the water-soil system due to rice root ROL. Although the oxygen content in control high-fertility soil (without rice plants) was lower than that in control low-fertility soil, high rice root ROL significantly improved the rhizosphere oxygen concentration in the high-fertility soil. High soil fertility improved the rice root growth and root porosity as well as rice root ROL, resulting in enhanced rhizosphere nitrification. High fertility also increased the content of nitrification-induced nitrate in the rhizosphere, resulting in enhanced ammonium uptake and assimilation in the rice. Although high ammonium pools in the high-fertility soil increased rhizosphere nitrification, rice root ROL might also contribute to rhizosphere nitrification improvement. This study provides new insights into the reasons that an increase in soil fertility may enhance the growth of rice. Our results suggest that an amendment of the fertiliser used in nutrient- and nitrification-poor paddy soils in the red soil regions of China may significantly promote rice growth and rice N nutrition.Yilin LiWeiming ShiXingxiang WangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e109161 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yilin Li Weiming Shi Xingxiang Wang New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
description	The differences in rhizosphere nitrification activities between high- and low- fertility soils appear to be related to differences in dissolved oxygen concentrations in the soil, implying a relationship to differences in the radial oxygen loss (ROL) of rice roots in these soils. A miniaturised Clark-type oxygen microelectrode system was used to determine rice root ROL and the rhizosphere oxygen profile, and rhizosphere nitrification activity was studied using a short-term nitrification activity assay. Rice planting significantly altered the oxygen cycling in the water-soil system due to rice root ROL. Although the oxygen content in control high-fertility soil (without rice plants) was lower than that in control low-fertility soil, high rice root ROL significantly improved the rhizosphere oxygen concentration in the high-fertility soil. High soil fertility improved the rice root growth and root porosity as well as rice root ROL, resulting in enhanced rhizosphere nitrification. High fertility also increased the content of nitrification-induced nitrate in the rhizosphere, resulting in enhanced ammonium uptake and assimilation in the rice. Although high ammonium pools in the high-fertility soil increased rhizosphere nitrification, rice root ROL might also contribute to rhizosphere nitrification improvement. This study provides new insights into the reasons that an increase in soil fertility may enhance the growth of rice. Our results suggest that an amendment of the fertiliser used in nutrient- and nitrification-poor paddy soils in the red soil regions of China may significantly promote rice growth and rice N nutrition.
format	article
author	Yilin Li Weiming Shi Xingxiang Wang
author_facet	Yilin Li Weiming Shi Xingxiang Wang
author_sort	Yilin Li
title	New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
title_short	New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
title_full	New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
title_fullStr	New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
title_full_unstemmed	New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.
title_sort	new insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical china.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/f2c02a4a7f5b4a7ab3fae3f678c4cca7
work_keys_str_mv	AT yilinli newinsightsintohowincreasesinfertilityimprovethegrowthofriceattheseedlingstageinredsoilregionsofsubtropicalchina AT weimingshi newinsightsintohowincreasesinfertilityimprovethegrowthofriceattheseedlingstageinredsoilregionsofsubtropicalchina AT xingxiangwang newinsightsintohowincreasesinfertilityimprovethegrowthofriceattheseedlingstageinredsoilregionsofsubtropicalchina
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New insights into how increases in fertility improve the growth of rice at the seedling stage in red soil regions of subtropical China.

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