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Increasing Soil Organic Carbon for Higher Wheat Yield and Nitrogen Productivity

文献类型： 外文期刊

作者： Pan, Junxiao 1 ; Miao, Qi 1 ; Zhang, Wenjie 2 ; Wang, Hongye 4 ; Wang, Weidong 5 ; Xue, Yanfang 1 ; Qi, Shijun 1 ; Cui, Zhenling 1 ;

作者机构： 1.Shandong Acad Agr Sci, Maize Res Inst, Natl Engn Lab Wheat & Maize, Jinan 250100, Peoples R China

2.China Agr Univ, Ctr Resources Environm & Food Secur, Beijing 100193, Peoples R China

3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

4.Minist Agr & Rural Affairs, Cultivated Land Qual Monitoring & Protect Ctr, Beijing 100125, Peoples R China

5.Agr & Rural Bur Huimin Cty, Binzhou 251700, Peoples R China

关键词： Manure; soil organic carbon; N management; yield; N productivity

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Improving soil organic carbon (SOC) has been considered as a "win-win way" for ensuring high crop productivity and mitigating chemical N input. Improving SOC can achieve higher wheat yield and simultaneously improve nitrogen (N) productivity (defined as kg grain produced per kg total N input from both indigenous and applied N). Two treatments were tested for improving SOC level. The manure treatment involved applying manure for 6 successive years, and the EM treatment involved adding peat and vermiculite once, both combined with optimized in-season N management. The performance of these two systems were compared with a traditional farming system (Control, where only straw was returned each season). N fertilizer input under all three treatments was optimized by in-season N management and was increased by 90.1% and 48.1% under EM and Manure treatments, respectively, as compared with Control. The average wheat yield for the EM and Manure treatments was 9.1 and 9.2 Mg ha(-1), respectively, across all three years, which was 18.8% and 19.7% higher, respectively, than that of the Control treatment (7.7 Mg ha(-1)). The average chemical N application rates for the EM and Manure treatments were 139 and 146 kg ha(-1), which were 24.9% and 21.1% lower than those of the Control treatment, respectively. The N productivity was 15.1% and 14.9% which was higher under Manure and EM treatments than that of the Control treatment. The high yield and N productivity were attributed to improved aboveground dry matter and N uptake by wheat, with optimal soil N supply of the root zone. The higher stem number and weight seen in individual plants with increasing SOC resulted in larger spikes and grains at harvest. Our results determined that increasing SOC combined with optimal N management achieve low chemical N input and higher grain yield by increasing productive stems and grains per spike for improving wheat individual growth.

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