Sweet potato deficiency symptoms and fertilization techniques

The roots of sweet potato are deep and wide, and stems and vines are rooted in their habitats. They have strong fertility, so they are resistant to drought and drought. Practice has shown that the demand of sweet potato for nitrogen, phosphorus, and potassium is the highest in potassium, followed by nitrogen, Phosphorus is next, and the ratio of three elements of cerium, phosphorus, and potassium required during the growth process is generally 1:1:2.5. However, the three elements have different functions and cannot be replaced with each other. The function and deficiency of one or three elements 1. Nitrogen is an important part of protein. If nitrogen is insufficient, the old leaves will first show a lack of green, the number of leaves and branches will decrease, the leaves will shrink, and the internodes will shorten. It is prone to yellowing and premature aging, further development of old leaf shedding, reduced photosynthetic efficiency, and severely affecting yield. 2. Phosphorus is an important part of sweet potato cells, which can promote the development of the root system, enhance photosynthesis, promote the synthesis, transportation and storage of carbohydrates, increase the starch content of the tubers and increase the yield. If phosphorus is lacking, it will cause the leaves to become smaller, dark green, lose luster, and the extension of the stems will be hindered. After that, large patches of yellow spots will appear in the old leaves and become purple, and will soon fall off. 3. Potassium is the most important element influencing the yield and quality of sweet potato. It can prolong the functional period of the leaves, keep the stems and leaves and the petiole young, promote the expansion of the tubers, accelerate the transport of photosynthetic products, promote the synthesis and accumulation of starch, and Improve the disease resistance and storage performance of sweet potato. The lack of potassium showed a small leaf, short internodes and petioles, dark green leaves, and brown spots on the back of the late leaves. Second, fertilization technology should be based on the local soil conditions, climate conditions and the characteristics of different varieties of sweet potato growth, the rational application of fertilizer, and only master the "pre-promotion, in the control, late prevention of premature aging" principle, in order to achieve the best increase in production. Specifically grasp the following aspects: 1. Increase base fertilizer. Mainly organic fertilizer, supplemented by inorganic fertilizer. The amount of basal fertilizer used accounts for more than 80% of the total amount of fertilizer. According to the yield of sweet potato of 2,500 to 3,500 kg per 667 square meters (1 mu), 3000 to 4,000 kg of base fertilizer and 50 kg of three-element compound fertilizer should be applied. Organic manure mainly includes miscellaneous fertilizers, manure fertilizers, and human and animal manures. They are all complete fertilizers, gradually decomposed after application, and continue to exert their fertilizer effects. They are very adaptable to the long growing period of sweet potatoes, but require full maturity, so the farmers said: "The sweet potato Hi every year, excrement.” The method of application is stratified staged application, that is, 1/2 for ploughing and ridging, and the crude fertilizer is used as a base, and the fertilizer is applied to the surface, combined with depth and depth, and can effectively meet the sweet potato front, middle, and The need for late nutrients promotes normal growth of sweet potatoes. 2. Reasonably top-dressing. Early Miao Miao fertilizer, strong seedling fertilizer, generally 3 to 4 days after planting to 30 days after planting, pouring thin human fecal urine 2 times, each time according to the situation of the seedlings plus urea 1 to 3 kg per 667 square meters. The potato fertilizer and the long potato fertilizer generally account for 20% of the total amount of fertilizer, and the time is about 50 days after planting. The side of the ridge is broken and soil fertilized, also called clip-side fertilizer. It is also possible to apply the crack fertilizer in time when the sweet potato ridge is cracked, and generally apply the appropriate amount of ammonium bicarbonate to the human feces. 3. Top dressing. The sweet potato is generally grown in the late stage. The leaves are sprayed with 0.2% potassium dihydrogen phosphate solution, 0.5% urea solution, and 2% to 3% calcium superphosphate solution. The spraying time should be in the evening, spraying every 7 to 10 days. Times, spray 2, 3 times.

Permanent Makeup

Make Up Kits,Piercing Kits,Professional Tattoo Kits

Danyang Trading Co., Ltd. , http://www.gdtattoomachine.com