A study was conducted to determine the influence of L-TRP(L-tryptophan) applied to soil on the yield and nurtient uptake of cabbage (Brassica olercea Var. capitata L.)in a pot experiment. The results showed that L-TRP applied to soil a week before transplanting might obviously increase the cabbage yield, dry matter accumulation and the uptake of nitrogen, phosphorus and potassium of cabbage plants, Nitrogen and phosphorus distributed in the head leaves increased but potassium decreased.
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Chen Zhende, Huang Junjie, He Jinming, Ca Kui. INFLUENCE OF L-TRYPTOPHAN APPLIED TO SOIL ON YIELD AND NUTRIENT UPTAKE OF CABBAGE[J]. Acta Pedologica Sinica,1997,34(2):200-205.