The Boundary Line Analysis Assesses Limiting Factors of Wheat/Watermelon/Maize Intercropping System

doi:10.11924/j.issn.1000-6850.casb18090047

Abstract

Abstract:

This study aims to analyze key factors limiting yield of wheat/watermelon/maize intercropping system and optimize the system. By using farmer survey, we investigated the wheat/watermelon/maize intercropping model in Quzhou County, Hebei Province, including the seeding rate, nutrient input and yield of wheat and maize, as well as nutrient input and yield of watermelon, and then applied the boundary line analysis to assess the limiting factors of wheat/watermelon/maize intercropping high-yield system. The results showed that the key limiting factor of wheat yield was the seeding rate, which contributed up to 17.8%, followed by nutrients input with P₂O₅, K₂O, N contribution of 12.5%, 11.7% and 8.0%, respectively. The key factor limiting watermelon yield was potassium fertilizer input, with the contribution rate of 15.8%, and N, P₂O₅ contribution of 14.2% and 11.8% respectively. The key factor limiting maize yield was nitrogen fertilizer input, with the contribution rate of 20.6%, followed by K₂O of 14.2% and P₂O₅ of 11.5%, and sowing density of 9.2%, respectively. In conclusion, in the wheat/watermelon/maize intercropping system, farmers should properly regulate sowing rate of wheat, optimize the amount of potassium fertilizer for watermelon and nitrogen fertilizer for maize, and consequently promote the yield advantage of the intercropping system.

Key words: nutrient input, seeding rate, intercropping, boundary line analysis, limiting factor

CLC Number:

S512

Yang Xiaotong, Zhang Yi, Lin Yaoyao, Liao Dan, Huang Chengdong, Zhang Chaochun. The Boundary Line Analysis Assesses Limiting Factors of Wheat/Watermelon/Maize Intercropping System[J]. Chinese Agricultural Science Bulletin, 2020, 36(3): 40-46.

Figures/Tables 3

References 22

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