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Problems of low crop yields and declining soil fertility, the study unreasonable fertilization lead to organic farming research homemade organic liquid fertilizer and biogas slurry dressing of organic crop production and the establishment of the system of rational fertilization of organic crops. The test to select three local common planting organic crops radish, Chinese cabbage, soybean open-air cultivation. A small amount of fertilization by different fertilizer levels, conventional fertilization, excessive fertilization (ratio 1:2:3), three fertilization mode single application of organic manure fertilizer, organic chicken manure as the basic fertilizer homemade organic liquid fertilizer top-dressing as a basic fertilizer, biogas slurry fertilizer, organic chicken manure top dressing of organic crop production, organic cropping system, N, P and K nutrient balance and to the dynamic changes of soil nutrients, the main findings are as follows: (1) with a single application of organic manure fertilizer, organic chicken manure fertilizer as basal fertilizer homemade organic or biogas slurry do dressing can significantly improve the leafy cabbage, soybean yield, yield improvement did not reach a significant level of root vegetables radish; conventional fertilization, organic chicken manure fertilizer for the base manure homemade organic liquid for dressing mode than the single application of organic chicken manure radish, Chinese cabbage, soybean yields were increased by 12.3%, 13.1%, 11.9%; organic chicken manure fertilizer as basal fertilizer biogas slurry dressing mode than the single application of organic manure fertilizer radish, Chinese cabbage, soybeans production increased by 1.7%, 10.0% and 13.4%, respectively. (2) organic cropping systems of N, P and K nutrient balance of payments: conventional fertilization with single facilities than organic chicken manure fertilizer, organic chicken manure fertilizer as basal fertilizer homemade organic or biogas slurry doing the dressing nutrient spending more close to the nutrient inputs. Conventional fertilizer, organic chicken manure fertilizer as basal fertilizer homemade the organic liquid dressing radish planting system N, P and K nutrient balance coefficient 0.89,1.34,0.90; cabbage cultivation system N, P, K nutrient balance coefficient 0.91,1.28,0.82; soybean planting system N, P, K nutrient balance coefficient for 1.03,1.73,0.70. Cabbage and soybean planting process is the need to increase investment in potash. (3) the dynamic changes of soil nutrients in organic vegetable growing: in the amount of conventional fertilizer, organic chicken manure fertilizer as basal fertilizer top dressing of homemade organic liquid mode, radish, cabbage, soybean planting organic matter content of the soil before and after the increase in the proportion of 2.53%, 2.40% 7.17%; radish, Chinese cabbage, soybean planting soil total nitrogen content before and after increase in the proportion of 1.68%, 0.90%, 12.33%; radish, Chinese cabbage, soybean planting soil available phosphorus content increased ratio of 9.23%, 79.16%, 23.57 %; radish, cabbage, soybeans planted before and after the changes in available potassium ratio of 4.02% -11.76% -7.35%. (4) considering the production of organic vegetables, organic vegetable growing system nutrients N, P, K balance of payments, the soil nutrient dynamic changes. The optimum fertilization in organic radish planting base fertilizer organic chicken manure fertilizer for 7500 kg/hm2 10000 kg/hm2 homemade organic liquid fertilizer top dressing, translated as the N nutrient 127.95 kg/hm2 69.15 kg/hm2 P2O5 and K2O 51.45 kg / hm2, its yield 62.9 t/hm2; the organic cabbage planting ideal fertilization for 30000 kg/hm2 organic chicken manure fertilizer as base fertilizer, 22500 kg/hm2 of biogas fertilizer top dressing, converted into nutrients N 298.28 kg/hm2 P2O5244 .16 kg/hm2, K2O210.41 kg/hm2, production 124.3t/hm2; optimal fertilization of organic soybean planting base fertilizer organic chicken manure fertilizer for 6000 kg/hm2 15000 kg/hm2 of homemade organic liquid fertilizer top dressing, converted into nutrient of N100.13 kg/hm2, P2O578.95 kg/hm2, K2O80.78 kg/hm2, production reached 1716.67kg/hm2.
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