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Subsoil Tillage and Organic Fertilization Benefit Rice Root Growth and Yield by Ameliorating Soil Compaction and Fertility

文献类型： 外文期刊

作者： Bu, Rongyan 1 ; Li, Min 1 ; Cheng, Wenlong 1 ; Han, Shang 1 ; Wang, Hui 1 ; Tang, Shan 1 ; Lu, Changai 2 ; Wu, Ji 1 ;

作者机构： 1.Anhui Acad Agr Sci, Soil & Fertilizer Inst, Key Lab Nutrient Cycling Resources & Environm Anhu, 40 Nongke South Rd,Luyang Dist, Hefei 230001, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 10081, Peoples R China

关键词： Tillage practice; Organic amendment; Rice yield; Root growth; Nutrient uptake; Soil quality

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.9； 五年影响因子：3.9 ）

ISSN： 0718-9508

年卷期： 2023 年

页码：

收录情况： SCI

摘要： PurposeThe aim of this study was to clarify the effects of different tillage and organic fertilization practices on rice root growth, grain yield, and soil quality under rice-wheat rotation.MethodsA three-year field experiment (2017-2020) was carried out under different practices of tillage (i.e., rotary tillage, RT; subsoil tillage, ST) with organic fertilization (i.e., rice/wheat straw, organic manure, straw plus manure). The control plots were rotary tilled and applied with chemical fertilizers only. There were three replications for each treatment.ResultsAll the organic fertilization treatments led to variable increase (3.3%-12.7%) in the grain yield of rice compared with chemical fertilization only. ST caused an average yield increase of 3.1%-4.3% compared with RT under the same fertilization treatment. When ST plots received organic fertilization, the root length density of rice significantly increased from the booting stage compared with that in RT plots. The largest increase in root length density occurred in the subsoil (15-30 cm), which contributed to shoot N uptake. ST with organic fertilization also reduced subsoil compaction, without affecting topsoil compaction (0-15 cm). In the topsoil, organic matter, total nitrogen, available phosphorus, and available potassium contents were higher under RT than under ST, whereas the opposite trend was observed in the subsoil. Partial least squares path modeling revealed that tillage mainly reduced soil compaction and organic fertilization principally increased soil nutrients, thereby promoting root growth of rice. The influence of soil nutrients and compaction on root length density of rice grew stronger in the subsoil relative to the topsoil.ConclusionsThe co-application of crop straw and organic manure enhanced soil nutrient storage capacity, and combined ST alleviated subsoil compaction, promoted downward root growth, and facilitated plant nutrient uptake, which contributed to the improvement of grain yield in rice.

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