Study On Nutrition Regulation And Control In Ecotype Soilless Culture

Choosing ChongQing district agriculture object discarded fungus Dregs % straw as well as river sand as substrate,experiment is carried on in the pot and in field using commercial organic fertilizer Fu erdi and Tian Bishi,studying the selecting of substrate and fertilizer effect and utilization efficency of organic fertilizer,aiming at providing the science basis for the ecotype soilless culture of ChongQing city.Results achieved were as follows:1. Experiment of vegetable cultivation in soild substrate indicates that yield and quality of the Chinese cabbage and lettuce of different substrate treatments are better than of that is cultivated in soil(Ck),In the same quantity of fertilizer.2. Experiment of vegetable cultivation in soild substrate indicates that At the various matching ratio of organic and inorganic substrate.the optimal volume ratio of fungus dregs^ straw and sand is 3:0:1.In solid substrate(fungus dregs:straw:sand=3:0:l),yield and quality of lettuce and Chinese cabbage are superior to that are cultivated in other soild substrate.3. Experiment of cultivation in the pot indicates, Using organic fertilizer Fu erdi,hot pepper that is cultivated in solid substrate blossom. bear and go on the market earlier 7 days than that is cultivated in soil; but using organic fertilizer Tian bishi,the birth phase of hot pepper in solid substrate and soil is the same.4. In the soil cultivation,using organic fertilizer Fu erdi can make birth phase of the crop earlier than using Tian Bishi.Experiment in pot indicates,using organic fertilizer Fu erdi in soilcultivation.the maturity period of hot pepper is earlier 7 days than using organic fertilizer Tian Bishi in soil cultivation.5. under the cultivation model of the fungus dreg:straw:sand=3:0:l(vol proportion), optimal quantity of commercial organic fertilizer Fu erdi and Tian Bishi in pot is llg/pot, and using Tian Bishi quantities of fertilizer recommended in the field is 3126kg/hm2,using Fu erdi quantities of fertilizer recommended in the field is 3230kg/ hm2.6. The utilization efficiency of the element of NX P and K in commercial organic fertilizer is very high.Experiment indicates,the utilization efficiency of N in organic fertilizer Tian Bishi reachs 68%,P and K reachs 32.7% and 67.1%,respectively. the utilization efficiency of N in organic fertilizer Fu erdi reachs 60.7%,the element of P and K reach 26.8% and 38.1%,respectively.7. In the same quantity of fertilizer,The utilization efficiency of NX P and K of organic fertilizer Tian Bishi and Fu erdi in solid substrate is the same or slightly high with in soil.8. Vegetables that are cultivated in solid substrate(fungus dreg:straw:sand=3:0:l) using organic fertilizer(Fu erdi and Tian Bishi) can reach the standard of'green food'Vegetable production.The analysis indicates,the heavy metal content of organic fertilizer Fu erdi> Tian Bishi and fungus dregs achieves the production standard of "green food",nitrate content of vegetables is extremely low, and keeping in the standard of safety limit.