High-yield technology for spring cultivation of Chinese cabbage
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1. Choosing the right variety and sowing date Choose the South Korean "Spring and Summer King" Chinese cabbage variety. The variety is not sensitive to low temperature reaction, and it is difficult to vernalize and prematurely convulsion. Through the cold bed breeding around April 10 and around 20 days, the planting in 1 month, and the direct fielding in early May, the actual field growth of 3 different treatments. In the investigation, we found that except for the cold bed seedlings on April 8 and the very few strains that were planted on May 10, there was no convulsion in the subsequent batch treatment, and under the same conditions, other varieties of spring cabbage were used. There are different numbers of plants twitching, and some even cause no harvest.
2, determine the appropriate seedling age Chinese cabbage leaf ball generally consists of 35-70 leaves. The differentiation of these leaf primordia is completed approximately when 8 true leaves are unfolded. The development of 8 true leaves takes about 1 month in the spring. If the seedling period is too long, the survival rate of planting in the field will decrease; if the leaf is not transplanted, it will affect the differentiation of leaf buds, leading to premature formation of flower buds and convulsions. After 30 samples, the number of leaf leaves of "Spring and Summer King" varieties was between 48-59 leaves. This not only avoids the survival rate of the seedling period is too long, but also avoids the number of leaflets with sufficient short-term growth and differentiation.
3, strengthen the field management Spring planting cabbage field management is different from autumn cultivation, the whole process emphasizes a "guarantee" word. 3.1 Nursery bed bed soil allocation services for "fat", "warm", "fine", "song". It adopts 2/3 non-cross flower garden field, 1/3 decomposed manure, 0.2% diammonium nutrient soil formula, and sieved bed, which lays a good foundation for cultivating strong seedlings. 3.2 All the film mulching techniques are used for planting. Each mu of farmer's fertilizer is 4000 kg, diammonium 15 kg, and the plant spacing is 0.5×0 4 m. 3.3 After planting the water, wait until the ground sees the wet and immediately dry the seedling water. There is no seedling during the whole growth process. Keep the field dry and dry. After 1 month of planting, the urea is chased once, 10-15 kg per mu.
4, pest control This test was investigated only for the first phase of soft rot (April 8 seedlings, planting on May 10), mild occurrence, the second phase and the third phase almost no such phenomenon. Controlled with agricultural streptomycin 150 mg / kg spray. The incidence of downy mildew appears to be lighter before and after. It can be controlled by using 600-800 times of mancozeb or 400 times of spray.
5, timely harvest 
