The common feature of heart-wrapped vegetables is that the feeding organs are mainly vegetative bodies, and their growth is generally short, especially the initial growth, which has a greater impact on yield and quality.
1. Chinese cabbage
Its root system is well developed, it needs a lot of water and fertilizer during its growth period, and it is easy to be infected with pests and diseases. 120-160 kilograms of bio-organic fertilizer and 20 kilograms of superphosphate per mu of arable land, of which 2/3 of the fertilizer is applied to the middle and lower layers of the soil, and 1/3 of the fertilizer is spread on the surface. After leveling the ground, lay the border 2-3 days before planting. After setting the seedlings, 15-20 kg of ammonium sulfate should be topdressed per mu, and then appropriate shallow cultivating once without squatting the seedlings.
Two, cabbage
It is easy to plant, resistant to severe cold, and has a high yield. For cabbage, choose plots with fertile soil, convenient irrigation and drainage, and non-recropping. Apply 2 kg of bio-organic fertilizer per square meter of seedbed, and mix the bio-organic fertilizer with the seedbed soil evenly to prepare the ground for sowing seedlings. Seedling age 30 days, seedling 4-6 leaves can be planted. Before planting, apply 120-160 kg of bio-organic fertilizer per mu, ridge and single-line planting. Water after planting the seedlings, topdressing 10-15 kg of urea per mu after slow seedling, topdressing twice before and after the rosette period, combined with watering and applying 20-30 kg of biological organic fertilizer per mu. After heading, stop fertilizer and water management.
Three, lettuce
Also known as leaf lettuce, the root system is shallow, the fibrous roots are developed, and the root group is mainly distributed in the soil layer of 20-30 cm above the ground. Before sowing, apply 2 kg of bio-organic fertilizer per square meter, mix it with the seedbed soil and then sow. Before planting, fertilize the ground first, and apply 120-160 kg of biological organic fertilizer per mu. After lettuce squatting for 5-7 days, apply 20 kg of bio-organic fertilizer per mu, and apply fertilizer with water to keep the soil moist. In the early stage of heart leaf involution, 0.2% urea and 0.2% potassium dihydrogen phosphate were sprayed on the leaves.
Fourth, cauliflower
Cauliflower has a shallow root system and requires a large amount of fertilizer. It must be fertile, loose, rich in organic matter, loam or clay loam with good fertilizer and water retention properties, and sufficient base fertilizer must be applied. First of all, we must pay attention to the application ratio of nitrogen, phosphorus, and potassium in the nutrient soil during the nursery period. Before planting, apply 80-100 kg of biological organic fertilizer and 2500-5000 kg of organic fertilizer as base fertilizer. At the stage of lotus leaf growth and flower bud development, apply 6-8 kg of ammonium sulfate per mu with water. In the heading period, generally use about 15 kg of ammonium sulfate per mu of irrigation water, and topdressing once every 8-10 days until the curd is fully grown.
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