Effects of polymeric slow release fertilizer on Chinese cabbage growth and soil nutrients

摘要

One pot experiment was conducted to study the effects of a new polymeric slow release fertilizer (PRF) on Chinese cabbage growth and soil nutrients. The experiment comprised three kinds of fertilizer (common compound fertilizer, 21% and 45% solubility of PRF in 25 degrees C water, all fertilizers with N:P2O5:K2O=10:5.7:20) and three fertilizer levels (0, 21.6 and 43.2gm(-2)). Results showed that the high water-soluble PRFs (PRFHH and PRFHL) fit nutrient requirements of Chinese cabbage, and the high fertilization level significantly increased yield and improved quality of Chinese cabbage. Although the PRFHL treatment at 21.6g fertilizer m(-2) had one-half less supplied nutrient than that of common compound fertilizer treatment (43.2g fertilizer m(-2)), the yield of Chinese cabbage with PRFHH and PRFHL was 8.0% more. The soluble sugar, vitamin C and leaf chlorophyll contents of Chinese cabbage can be effectively improved with PRFHH (43.2gm(-2)), PRFHL (21.6gm(-2)) and PRFLH (low water-soluble PRF, 43.2gm(-2)). The PRF treatment reduced the nitrate content and improved soil capacity of supplying nutrient effectively, and there were no changes in values of pH and electrical conductivity of soil.