| Abstract: In order to speed up the promotion of pickled cowpea and achieve cost-saving and benefitsincreasing cultivation, Chengjiang No.9 was used as experimental material to study the effects of differentplanting densities on agronomic trait, yield and benefit. The results showed that with the increase of density, leaveswith strong growth potential growed bigger, but the yield decreased, pests and diseases increased, and the costincreased. The yield and value of treatment 3 (9 000 plants per 667 m2, 1 800 holes, row and hill spacing 170 cm×45 cm) was the highest; the cost of treatment 1 (9 000 plants per 667 m2, 1 500 holes, row and hill spacing170 cm×50 cm) was the lowest. The comprehensive analysis indicated that the treatment 1 was the most suitabledensity for Chengjiang No.9 cultivation and had low cost, high efficiency and optimal comprehensive benefits. |