Effects Of Applying Biogas Slurry-Based Fertilizer On The Growth And Quality Of Pakchoi And Soil Qualities

Because of the advent ages of biogas and the demand of the excellent vegetable in China recently. A pot experiment was carried out to studyt the effects of applying biogas slurry-based and inorganic compound fertilizers on the growth, quality and soil qualities, pakchoi as experimental plant. which is aimed at providing the basis of the theories and practices for the safety applications and providing the science basis of choose the excellent soil fertility and optimizing the combination of fertilizer for producing innocuous of the low nitrate and high nourishment quality. The main conclusions are the following:(1) With the increasing in biogas slurry-based fertilizer, pakchoi in dry weight and fresh weight were showed a trend from ascent to descent, that reached significant level. The inflection point is 15 ml/pot ( A3).(2) In the same nitrogen condition, the biogas slurry-based fertilizer has better impacts on the biomass and nitrate of pakchoi than the inorganic compound fertilizers. Pakchoi in dry weight, compared with inorganic compound fertilizer, the biogas slurry-based fertilizer application of biogas slurry can be increased by 5.82% ~ 10.67% . Pakchoi in fresh weight, compared with inorganic fertilizer, the biogas slurry-based fertilizer application of biogas slurry can be increased by 3.61%~10.81%. Pakchoi root dry weight, root dry weight increased to 12.57% ~ 22.90%. The root shoot ratio, the ratio of up to 0.104, ensuring its root system growth, thereby ensuring good plant growth.(3) The biogas slurry-based fertilizer can improve the quality of rapeseed, reduce the residues of harmful substances. In nitrogen condition, compared with inorganic fertilizer, can make the nitrate content decreased from 38.85% to 52.97%, with high content of Vc was 41.88 mg/kg, reducing sugar content was increased by 6.81% ~ 21.32%.(4) The biogas slurry-based fertilizer on pakchoi growth period effect of soil physic chemical properties. The biogas slurry-based fertilizer on the nitrogen, phosphorus, potassium is increased, The highest content is 1.44 g/kg, compared with inorganic compound fertilizer, application of biogas slurry fertilizer treatment were increased by 6.72%, 9.30% and 19.63%. So helps regulate the soil pH value, EC value, reduce the residual amount of nitrate. So that the biogas slurry-based fertilizer on the soil, good improvement effect. (5) The biogas slurry-based fertilizer can improve the absorption of nutrient content of pakchoi, and compared with inorganic compound fertilizer, to total N, total P, total K uptake. The biogas slurry-based fertilizer treatment were increased by 29.68%, 8.97% and 15.06%, and then improve the nitrogen utilization rate, making it up to a maximum of 59.90%, reduces the nitrogen residue in soil.