Abstract:

To explore the effects of organic fertilizer replacing part of chemical fertilizer application on the yield of fresh broad beans and soil nutrients while the total nitrogen application rate remains unchanged, using ‘Yudou No.3’ as the material and adopting a random block design of factors, the effects of organic fertilizer replacing chemical fertilizer at ratios of 20%, 40%, 60%, 80% and 100% were studied respectively. The results showed that when organic fertilizer replacing part of chemical fertilizer, the agronomic traits of fresh broad beans varied significantly with different nitrogen ratios. The plant height and pod length under 20% substitution treatment performed the best; the number of leaf stalks and branches under 60% substitution treatment performed the best; the pod width under 100% substitution treatment performed the best; under 60% substitution treatment, the solidification and mineralization intensity of soil hydrolyzable nitrogen was the lowest. Under the condition that the total nitrogen application remains unchanged, the combined application of organic fertilizer and chemical fertilizer could increase the fresh pod yield of broad beans. When the substitution rate was 80%, the utilization of the fertilizer was the best, the partial productivity of nitrogen fertilizer was the highest, the contribution rate of fertilizer was also the largest, and the fresh pod yield was maximized.

Key words: fresh broad beans, yield, organic fertilizer, substitution, soil nutrients