In production practice, it is very important to fully understand the law of demand for fertilizers for carrots and master scientific fertilization techniques in order to increase production, improve quality, and achieve reasonable input and high-yield output.
Fertilizer requirement
According to the study: for every 1,000 kilograms of carrots produced, 2.4 to 4.3 kilograms of nitrogen, 0.7 to 1.7 kilograms of phosphorus, and 5.7 to 11.7 kilograms of potassium are required. The law of sucking fertilizers is as follows: the early growth period is slow, and the growth rapidly increases when the roots begin to expand in the middle and later periods, and the nutrient absorption also increases with the increase of the amount of the childbirth. In the two months after sowing, the absorption of each element was small. With the enlargement of the roots, the amount of absorption increased significantly. The maximum amount of potassium was absorbed, followed by nitrogen, calcium, phosphorus and magnesium, which in turn decreased. At the time of harvest, potassium was the most abundant in the leaves, followed by nitrogen, calcium, magnesium, and phosphorus. Potassium and nitrogen were the most abundant in the roots, followed by phosphorus, calcium, and magnesium. The requirement of nitrogen for carrots was mainly in the previous period. It was necessary to apply topdressing nitrogen fertilizer 30 to 50 days after sowing. In this period, there was a lack of nitrogen, and the diameter of roots was significantly reduced, and the roots of the roots were poorly swelled. Different forms of nitrogen have a great influence on the growth of carrots. Carbohydrate absorbs less phosphorus, about 1/3 of the amount of nitrogen absorbed. When the content of available phosphorus in soil is low, the effect of increasing phosphorus fertilizer is obvious. With the increase of fertilizer application, the yield also increases. For calcareous soils with large phosphorus absorption coefficients, the application of more phosphate fertilizers as basal fertilizer is beneficial to the early growth of plants and the expansion of root systems in the later period. The effect of potassium on carrots is mainly to enlarge the roots of the flesh, and attention should be paid to the application of potash fertilizer in the production to prevent potassium deficiency in the soil. In particular, during the period of root swelling, guarantee the supply of potassium fertilizer.
Fertilization technology
Apply base fertilizer. Carrot roots deep into the soil, suitable for loose loose sandy loam. Before planting, deep plowing should be applied and basic fertilizer applied. Per acre applied maturity manure and human excrement 2000 ~ 2500 kg, superphosphate 15 ~ 20 kg, plant ash 100 ~ 150 kg. If only chemical fertilizer is used, 20 kg of ammonium sulfate, 30-40 kg of superphosphate and 30-35 kg of potassium sulfate per mu can be used. There are two methods for application: application and furrow application. All application of solid fertilizer should be mixed with fine soil and mixed. Fertilization had a great influence on the shape of fleshy roots. When the amount of chemical fertilizers was large and organic fertilizer was low, the proportion of deformed roots increased significantly. Increased application of organic fertilizers as base fertilizer can reduce the formation of malformed fleshy roots. If unfailing organic fertilizers are applied, deformed roots can easily be added.
Reasonable top dressing. In addition to applying carrots, carrots are top dressing 2 to 3 times. The first time is usually 20 to 25 days after emergence, and after 3 to 4 true leaves are grown, 5 to 6 kg of ammonium sulfate per acre and 3 to 4 kg of potassium fertilizer are used. The second top-dressing is carried out after the carrots are seeded. Each can use 7 to 8 kg of ammonium sulfate and 4 to 5 kg of potash. The third top-dressing was in the peak period of root enlargement, and the fertilizer amount was the same as the second top dressing. In addition to chemical fertilizers, fertilized human excrement can also be used, ranging from 1,000 to 2,000 kilograms per mu. The topdressing method can be poured in with water, and human waste can be poured with water. In the later stage of growth, excessive fertilizer and water should be avoided, otherwise it is easy to cause cracking and is not conducive to storage.
Clever application of fertilizer. Carrots absorb more calcium, calcium content will make the carrot sugar and carotene content decreased, easy to cause a hollow disease when lack of calcium; carrot absorption of magnesium is not much, magnesium content, the amount of sugar and carrot The more the amount of prime, the better the quality. The use of calcium magnesium phosphate fertilizer in the base fertilizer can be sprayed once at the seedling stage and the leaf growth stage, respectively. In the early and middle stages of fleshy root enlargement, spray 0.1% to 0.25% boric acid solution or borax solution once.
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