| In order to control the nitrate of vegetables in soilless culture system effectively, the flowering Chinese cabbage was objected to study the nitrate domination diversity and mechanism of six cultivars planted in nutrient solution, and to explore a approach to control the nitrate accumulation by various methods. The study was about the influence of different organic fertilizers on the flowering Chinese cabbage yield, quality and nitrate accumulation by using bagasse as the grandmas , and the study discussed the fertilization technique of planting organic vegetable. The result of the study indicated that:1. The nitrate content of CHI HUA was less than that of SHI PAI, NO.31 SI JIU et.al among six cultivars planted in 1/5 Hogland nutrient solution, and the difference of the yield of CHI HUA, SI JIU, SHI PAI and NO.31 was not notable.2. The vary trend of the edible parts nitrate content of CHI HUA, SI JIU,SHI PAI and NO.31 was the same as nitrate uptake of cabbage which have planted 6 to 15 days and before harvest, but was different from the nitrate uptake quantity at anaphase and that of the enzyme activity of nitric acid deoxidized , which illuminated the amount of nitrate uptake by the flowering Chinese cabbage in seedling stage was very important to the nitrate accumulation in edible parts.3 . In the dynamic experiment of 15-d-old and 35-d-old seedling in a series of KNO3 solution (0, 0.3, 0.6, 0.9, 1.2, 1.5mmol/L), I was found that the tendency of nitrate uptake Vmax amond four cultivars at anaphase was the same as that of the edible parts nitrate content, while the difference of the uptake parameter of the root system and the Vmax at growth anaphase evening was different from that of the nitrate accumulation, even opposite. These the results illuminated that the nitrate uptake dynamic character of hereditary difference among cultivars at the developing anaphase decided the nitrate accumulation of the flowering Chinese cabbage.4. There was no negative influence on the stem height, leaves number, leaf area and nitrogen, phosphorous and potassium in plant, chlorophyll content, the protein and vitamin C content in the edible parts as comparied to that in the chicken ordure, pig ordure, biological organic fertilizer and sterilized biological organic fertilizer with abio-fertilizer, but the nitrate content in the edible parts was 589.1, 571.6, 517.6, 618.2, 674.9, 725.1 mg/Kg-FW, respectively, which was equal to 54.3%, 52.7%, 47.4%, 57.0%,62.2%, 66.9% of that in the control (only using abio-fertilizer). The edible yield of plants treated with chicken ordure or pig ordure was 88.1% and 91.2%, respectively, of that in the control, while the yield in other treatments were much higher than that in control. It was obvious that using organic fertilizer and abio-fertilizer suitably might not only meet the nutrient requirement of crop growth but also control the nitrate accumulation efficiently, improve the quality of vegetable and achieve a goal on high yield and quality vegetable production without public nuisance.5 The whole yield of the flowering Chinese cabbage and edible parts yield, the nitrate content in growing period plants and in edible parts increased after the biological organic fertilizer was sterilized, which illuminated that the biological organic fertilizer could control the nitrate content efficiently, although the microorganism in the biology organic fertilizer may not benefit to the growth of the flowering Chinese cabbage planted in the bagasse.
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