Cabbage Fertilization

Chinese cabbage with leaves as a product of the nitrogen requirements of the most sensitive. Is an adequate supply of nitrogen to increase the chlorophyll, manufacture carbohydrates increase, and also promoted the growth of leafy and increased production. If too much nitrogen and phosphorus, potassium, then the cabbage plants leggy, leaves large and thin, forming a tight ball and water content and more quality and decreased resistance to disease weakened. Phosphorus can promote leaf primordium, so that the outer leaves happen quickly, the ball leaves the division to increase, but also to facilitate its transport to the leaf ball. Adequate supply of potash, so that cabbage leaves the ball full, production increases, and also increase the nutrient content of cabbage and improve quality.

Cabbage whole-plant nitrogen-poor leaf color fades, plants grow slowly; P deficiency is dorsal the veins purple, dwarf plant; potassium externalize, Ye YE edge of yellow, or even dry brittle brittle leaf edge; cabbage calcium deficiency Yi Heart dry place. The growth of mature phase boron deficiency often occur in the petiole cork inside of the organization, from brown into black-brown, dead leaves around, forming the ball bad.

Fertilizer requirements of the law of cabbage

For every 100 kilograms of cabbage and about 150 grams of absorption of nitrogen, phosphorus and 70 grams, 200 grams of potassium. In the case of 5000 kilograms per-mu yield of about 7.5 kilograms to absorb nitrogen, phosphorus and 3.5 kg, 10 kg of potassium, the three elements of roughly the ratio of 1:0.47:1.33. This shows that the absorption of potassium, followed by nitrogen and phosphorus at least. The growth of Chinese cabbage during the three elements of the absorption is different from generally in line with the growth of plant dry weight is proportional to. Germination period to cropping period, only about 10% of the total absorption, while the cabbage for about a absorption of 90%. Absorption of each period the proportion of the three elements is not the same, the germination period to a maximum of rosette absorbed nitrogen, potassium and second, and phosphorus at least. Cabbage period of maximum absorption of potassium, nitrogen, second, and phosphorus is still at least. This is because the period of cabbage, Chinese cabbage need more potassium in the outer leaves to promote the manufacture of photosynthetic products, while also a considerable amount of potassium for photosynthetic products from the outer leaves to the leaves the ball up the transport and storage.

According to the amount of fertilizer required to grow cabbage and soil nutrient supply capacity is estimated that the actual level of fertilizer application in connection with current cabbage comprehensive analysis to determine the fertilizer: (1) target yield 8000 kilograms of the middle and upper to select late-maturing varieties, Mushi-quality manure 7500 kg, 23 kg of nitrogen, phosphorus and 10.5 kilograms, 15 kilograms of potassium; (2) target yield 6000 kilograms of middle ground, select early-maturing varieties, Mushi-quality manure 6500 kilograms, 20 kilograms of nitrogen, phosphorus and 9 kg, K 13 kg; (3) the next target yield 5000 kilograms and other places, usually selected early maturing, medium early maturing varieties, Mushi manure 5000 kilograms, 16 kilograms of nitrogen, phosphorus and 6 kg, about 9 kg of potassium.

Fertilization

(1) Shizujifei. Chinese cabbage growing season long, long优质有机肥require substantial fertilizer, so a large number of application of manure as base fertilizer is very important. Acres of land manure generally less than 5000 kilograms. In the land before the first 60% of the manure spreading deep plowing buried in the ground, rake in 40% of the manure before spreading into the shallow soil rake on the ground, and then ridge. Superphosphate or composite fertilizer should be at the time of Shi Shi manure, amount of 50 kg per mu ~ 75 kg.

(2) planting a good mention Miao Fei Shi. Seedling stage in order to ensure adequate nutrients, the need for topdressing fertilizer quick result, "mentioned Miaofei." 4 kg per mu with ammonium nitrate or ammonium sulfate, 5 kg to 8 kg, was broadcast on the planting hole before Shi, ditch the full mix well with soil and then watering planting.

(3) Fat tree fertilizer. Cropping period in the growth of rosette leaves in the future period of mass production in the cabbage photosynthetic organs of the product, full fertilizing watering is to ensure that the key to the growth of rosette leaves strong, but we must pay attention to prevent the extension of rosette leaves leggy heart was a result of the ball. "Fat trees fertilizer" should be a small number of plants in the field began to group into the trees when the facilities are generally Mushi into the feces and urine of 800 kg ~ 1500 kg, ash 50 kg ~ 100 kg, or 10 kg ~ 15 kg of ammonium nitrate, phosphorus and potash each 7 kg ~ 10 kg. Live cabbage plant fertilizer should be the edge of opening 8 cm to 10 cm in a small trench into fertilizer, and Gai Yan Shi soil. The cabbage will be transplanted into the compost trench hole with soil mix and then Zaimiao. If the late leggy rosette phenomenon, should be taken "Dunmiao" measures.

(4) knot ball fertilizer. Cabbage period is the formation of the product period, assimilation of the most powerful, therefore, need big fat water. Heart in the package 5 days to 6 days before the application of cabbage fertilizer, with a large number of fertilizer long-lasting complete fertilizer, in particular, to increase the applied potassium fertilization. General Mushi 20 kilograms of ammonium nitrate, superphosphate and potassium sulfate fertilizer of 10 kg to 15 kg, or 1600 kilograms dry manure to 2500 kg, ash 50 kg ~ 100 kg for knot ball fertilizer. In order to nutrients and lasting, the best fertilizer mixed with the decomposition of the manure, the line between the opening 8 cm ~ 10 cm deep groove of suitable facilities. The leaves have a strong top-dressing the ball inside to promote the "irrigation" in effect, so called "irrigation heart fat."