Abstract:

To study the effects of intercropping of leguminous green manure on the growth of Brassica chinensis, a field experiment was carried out in the suburb of Shanghai. The experiments included there treatments: single cropping of $\textit{Brassica chinensis}$, intercropping of $\textit{Brassica chinensis}$ and Chinese milk vetch ($\textit{Astragalus sinicus}$ L.), and intercropping of $\textit{Brassica chinensis}$ and Spring vetch $\textit{(Vicia gigantean Bge.}$). The results show that intercropping of leguminous green manure can significantly increase the plant height and sprout yield of the vegetable. Especially, intercropping of Chines milk vetch increased the yield of vegetable sprouts by 28.4%. Moreover, intercropping of leguminous green manure can also improve vegetable quality and raise activities of soil enzymes significantly. Intercropping of $\textit{Brassica chinensis}$ and Chines milk vetch can increase the contents of soluble proteins and soluble sugar in the vegetable sprouts by 33.6% and 73.6%, and raise activities of urease, sucrose and phosphatase by 23.8%, 22.2% and 23.9%, respectively. This can reduce application of chemical fertilizer and improve both the vegetable yield and quality, providing a better mode of $\textit{Brassica chinensis}$ cultivation.

Key words: green manure, $\textit{Brassica chinensis}$, soil, intercropping, enzyme activity