Long-term Nutrient Expert Management Improves Nitrogen Use Efficiency and Enhances Soil Organic Carbon Sequestration in Wheat-maize Rotation System

doi:10.7668/hbnxb.20191841

Abstract

Abstract: In order to explore the effects of nutrient expert (NE) management on nitrogen (N) use efficiency and soil organic carbon (SOC) sequestration in the wheat-maize rotation system and improve its management practices, a long-term experiment was set up in 2009 to compare NE management with farmer's practice (FP) management. Through 9-years experiment, the crop yield, N use efficiency, SOC content, SOC sequestration rate and SOC sequestration efficiency were measured and analyzed. The advantages of long-term NE management in wheat-maize crop rotation system were evaluated. The results showed that long-term NE management reduced the amount of N fertilizer application rate, compared with FP management, but maintained the crop yields (no significant difference with FP). Compared with FP management, the average accumulative recovery efficiency of N, agronomic efficiency of N, and partial productivity of N in NE management system increased by 7.4 percentage points, 39.7%, and 28.4% in maize production system, and increased by 8.0 percentage points, 28.9%, and 32.8% in wheat production system, respectively After 9-years experiment, both NE and FP increased the SOC contents, with NE management increased faster than FP. The annual SOC contents rise rates of NE treatment in 0-5 cm, 5-10 cm and 10-20 cm soil profile were 0.28, 0.27, 0.34 g/(kg·a), respectively, which were 7.7%, 68.8% and 126.7% higher than those of FP treatment. The average annual carbon input of NE and FP treatment from straw returning were 8.5, 8.7 t/(ha·a), respectively, and the SOC sequestration rates were 1.35, 0.68 t/(ha·a),respectively, and the SOC sequestration efficiencies were 18.6% and 0.4%, respectively, which shown a significant difference. NE management could improve N use efficiency and increase SOC sequestration. Long-term NE management is one of the important measures for fertilizer saving, efficiency strengthen and SOC pool richen in wheat-maize rotation system. It would play a crucial role in ensuring food security and realizing agriculture green development.

Key words: Wheat-maize rotation system, Nutrient expert management, Nitrogen use efficiency, Soil organic carbon, Carbon sequestration efficiency

CLC Number:

S143.1

HUANG Shaohui, YANG Junfang, YANG Yunma, JIANG Rong, HE Ping, JIA Liangliang. Long-term Nutrient Expert Management Improves Nitrogen Use Efficiency and Enhances Soil Organic Carbon Sequestration in Wheat-maize Rotation System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(2): 154-161. doi: 10.7668/hbnxb.20191841.

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