Organic-Inorganic Mixed Fertilizer Effects On Benefit And Physiological Mechanism Of Vegetable Crops

In order for development and extension of organic-inorganic mixed fertilizer for vegetable crops, the paper deals with the effects of organic-inorganic mixed fertilizer on the photosynthetic characteristic, key enzymes (such as sucrose synthase, sucrose phosphate synthase and nitrate reductase) of carbon-nitrogen metabolism, yields and quality (such as the content of vitamin C, soluble sugar, nitrate, inferior nitrate, coarse fibred and amino acids) of lettuce and Pak-choi using field plot experiment on the basis of the past experments. The main results were reported as follows:1. Organic-inorganic mixed fertilizer could increase the content of chlorophyll and net photosynthetic rate in the function leaves during middle and late growth stages of lettuce and Pak-choi.2. Organic-inorganic mixed fertilizer could significantly enhance the activities of sucrose synthase(SS) and sucrose phosphate synthase(SPS) and nitrate reductase(NR) in the function leaves during middle and late growth stages of lettuce and Pak-choi as compared to the treatments of chemical fertilizer and farmer fertilization practice.3. Organic-inorganic mixed fertilizer could promote the growth and increase the yields of lettuce and Pak-choi. The lettuce yield of the treatment with organic-inorganic mixed fertilizer was increased by 12.56% and 5.30% as compared to the treatment with chemical fertilizer and farmer fertilization practice, respectively. There was not significant difference for Pak-choi yield between the treatments with organic-inorganic mixed fertilizer and farmer fertilization practice; while there was significant at 1% level between the treatments with organic-inorganic mixed fertilizer and chemical fertilizer. Net incomes and output/input ratio from the treatment of organic-inorganic mixed fertilizer was the highest among three treatments. Organic-inorganic mixed fertilizer could significantly increase economic profit of vegetables production.4. Organic-inorganic mixed fertilizer could significantly increase the content of Vc and soluble sugar, and decrease the accumulation of nitrate and inferior nitrate and...