Vegetable application of biogas slurry and biogas residue technology
1. The biogas residue is used as the base fertilizer by transplanting the vegetables of the seedlings, and the base fertilizer is carried out by the method of acupoint application. When the seedlings are transplanted, they are applied with 2000 kg/mu of decomposed biogas residue, planted in the cave, and mixed with the garden soil excavated by the open hole for colonization. For vegetables that are used for on-demand or large-area cultivation, the base fertilizer is generally carried out by means of strips. For melons and vegetables, such as pumpkin, melon, cucumber, tomato, etc., generally use the method of big hole and big fat, use 3000 kg of biogas residue, 35 kg of superphosphate, and 100 kg of grass ash to mix into the hole and apply it to the hole. The upper layer of garden soil with a thickness of about 5-10 cm is poured into the water immediately after planting, and the straw or wheat straw is covered in time.
2. The topdressing of biogas slurry is generally carried out by root pouring and foliar spraying. The amount of biogas slurry in the root can be determined according to the variety of vegetables. The general dosage is 500-3000 kg per mu. Fertilization time is good for sunny days or evenings. It is not suitable for fertilization when rainy days or soils are too wet. The biogas slurry sprayed on the foliage is filtered through gauze before use. In the tender leaves of vegetables, the biogas slurry should be diluted 1 times in water, and the dosage should be between 40-50 kg. After the dew is dried up, the summer is good in the evening, and it is not sprayed at noon and rain. Leafy vegetables can be fertilized during any growing season of vegetables, and can also be sprayed with biogas slurry when combined with disease prevention and pest control. The melons can be grown in the bud stage, the flowering stage, and the fruit expansion period, and 3% potassium dihydrogen phosphate is added to the biogas slurry.