Synergistic Regulatory Effects of Planting Density and Nitrogen Fertilizer Interaction on Soybean Growth and Soil Nutrients in Saline-alkali Soil

doi:10.11924/j.issn.1000-6850.casb2025-0922

Abstract

Abstract:

This study explored the synergistic effects of planting density and nitrogen application rate on soybean growth, yield formation, and soil nutrient dynamics in saline-alkali soils. A two-factor field experiment was conducted on slightly saline-alkali land in Shihezi, Xinjiang, with three planting densities (170000, 220000, and 270000 plants/hm², referred to as D1, D2, and D3) and four nitrogen application levels (0, 75, 150, and 225 kg/hm², denoted as N0, N1, N2, and N3). The objective was to assess their impact on soybean growth, yield, and soil nutrient availability. The results indicated that soybean yield increased with the increase of nitrogen application up to a certain threshold, beyond which further nitrogen addition led to a decline in yield. The D2N2 treatment (220000 plants/hm² + 150 kg/hm²) significantly enhanced soil nutrient availability, with available nitrogen content rising by 147.21%-221.02%, compared to the D2N0 treatment. This treatment also promoted a 0.34 g/d increase in grain dry weight accumulation. A comprehensive analysis revealed that the D2N2 combination was optimal, achieving a synergistic increase in both soybean yield (5188.65 kg/hm²) and soil nutrient content by balancing planting density and nitrogen supply. This study provided a theoretical foundation for the strategy of “increasing yield through dense planting and enhancing efficiency with nitrogen” for soybean cultivation on saline-alkali soils.

Key words: planting density, nitrogen, saline-alkali stress, soybean, dry and fresh weight, soil nutrients

PENG Zicheng, LI Shuaihao, XIE Shirui, YANG Haichang, ZHANG Fenghua, LIU Feng, ZHOU Zhongkai, XU Yunjun. Synergistic Regulatory Effects of Planting Density and Nitrogen Fertilizer Interaction on Soybean Growth and Soil Nutrients in Saline-alkali Soil[J]. Chinese Agricultural Science Bulletin, 2026, 42(3): 109-118.

Figures/Tables 9

References 29

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