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Yield and nitrogen use efficiency in optimized oat-common vetch mixtures on the Qinghai-Tibet plateau
Mingfang Bao1, Zhaomin Wang1,2, Meng Yan1
1State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, China.
Abstract:
This study investigated the systemic effects of various nitrogen (N) regimes and phosphorus (P) additions on growth traits, N accumulation, and N fixation efficiency in mixed sowing systems of oat (Avena sativa L.) and common vetch (Vicia sativa L.) on the Qinghai-Tibet Plateau. Using a combination of field and pot experiments with a series of N-P co-application treatments, this study systematically measured the biomass, N accumulation, N fixation efficiency, and land equivalent ratio (LER) of two crop species in a mixed sowing system, and compared the results with monoculture treatments. Results indicated that N-enriched conditions significantly enhance biomass, and N accumulation in both species, with the A1V1 treatment (1:1 ratio) showing the highest aboveground biomass (1164 g·m-2) and an optimal Land Equivalent Ratio (LER) of 1.86. Phosphorus application improved N fixation and transfer, while moderate N-P co-application optimized N utilization within the system. Mixed sowing demonstrated superior N fertilizer utilization compared to monoculture, promoting sustainable agriculture by enhancing crop resilience and productivity. Adjustments in N-P addition based on specific soil conditions are essential to maximize benefits and avoid negative impacts on biological N fixation.
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