Chinese Cabbage Needed Fertilizer and Fertilization Technology

First, the need for fertilizer characteristics Chinese cabbage long growth period, high yield, nutrient demand is great, the maximum absorption of potassium, followed by nitrogen, calcium, phosphorus, magnesium. About 1,000kg of nitrogen (N), 0.94kg of phosphorus (P2O5) and 2.5kg of potassium (K2O) need to be absorbed per 1,000kg of Chinese cabbage. Due to different growth and growth rates of Chinese cabbage during different growth periods, the demand for nutrient conditions is also different. The total requirement fertilizer is characterized by less nutrient absorption at the seedling stage, absorption of nitrogen, phosphorus and potassium is less than 1% of the total absorption; rosette period is significantly increased, accounting for about 30% of the total; About 70% of the total. The proportion of three elements absorbed in each period is also different. From the germination period to the rosette stage, the absorption of nitrogen is highest, potassium is the second, and phosphorus is the least. The absorption of potassium is the most in the bulb stage, nitrogen is the second, phosphorus is the least, because the bulbous period needs more Potassium promotes the manufacture of photosynthetic products in the outer leaves, and at the same time requires a large amount of potassium to promote photosynthetic products to be transported and stored from the outer leaves to the leaf balls. Adequate nitrogen nutrition is of great importance to promote the formation of hypertrophic green leaves and increase photosynthetic efficiency. If the nitrogen supply is insufficient, the plants will be short, and the tissues will be rough and severely reduce yield; if there is too much nitrogen, the leaves will be large and thin. The heart is not true, the quality is poor, and it is not resistant to storage. Phosphorus is sufficient to facilitate the formation of leaf ball, potassium can increase the sugar content of Chinese cabbage, speed up the ball speed, if the late supply of phosphorus and potassium are insufficient, it is often not easy to ball. Cabbage is a hi calcium crop. When physiological calcium deficiency occurs under adverse environmental conditions, dry heart disease often occurs, which seriously affects the yield and quality of Chinese cabbage.

Second, fertilization technology Cabbage throughout the whole fertilization period for the farm fertilizer 2500-3000kg (or commodity organic fertilizer 350-400kg), nitrogen fertilizer (N) 13-16kg, phosphate fertilizer (P2O5) 5-8kg, potassium fertilizer (K2O) 10 -12kg, organic fertilizer as a base fertilizer, nitrogen, potassium fertilizer base fertilizer and topdressing, phosphate fertilizer as a base fertilizer, fertilizer and farmyard fertilizer (or commercial organic fertilizer) mixed application.

1. Base fertilizer. Basing on basal fertilization is the basis for the high yield of Chinese cabbage. The basal fertilizer applies 2500-3000kg per mu (or 350-400kg of organic fertilizer), urea 4-5kg, diammonium phosphate 11-17kg, **potassium 6-7kg, calcium-deficient soil ***20kg.

2. Top dressing. During the rosette period, the growth rate and growth of the Chinese cabbage are larger during the rosette period, which is an important period for the production of the crop. Adequate supply of fertilizer and water to ensure the vigorous growth of the rosette leaves is the key to high yield. Generally, lotus urea 6-7kg, **potassium 4-5kg can be applied during the lotus stage.

Composting during the ball stage: During the initial period of the ball growth, the outer leaves of the leaf ring grow rapidly and have the largest amount of growth. The demand for nitrogen nutrients is particularly high and should be topdressed once. In the mid-balloon period, the leaves in the leaf ball grow rapidly and fill the interior, and the amount of growth is also large. In order to prolong the function of the outer leaf and delay the aging of the leaf, the fertilizer should be topdressed according to the soil fertility. In general, the initial ball can be applied to urea 8-10kg, **potassium 6-7kg. The ball can be applied in the middle of urea 6-7kg, **potassium 4-5kg.

3. Top dressing. Spraying 0.3% calcium chloride solution or 0.25%-0.50% *** solution during the growth period can reduce the incidence of dry heartburn. Spraying 0.5%-1.0% urea or 0.2% potassium dihydrogen phosphate solution at the beginning of the ball can increase the net vegetable rate of Chinese cabbage. Increase product value.