Sweet potato middle and late field management

Sweet potatoes have entered the root swelling phase, which is the key period for the formation of yield. If the management is not good, it will cause a significant reduction in production of sweet potatoes. Combining years of production practice, the author concluded a set of post-management experience for farmers' reference:

First, the management of water

In the late stage of the growth of sweet potato, in the rainy season, it is necessary to drain the drain in time to avoid waterlogging. The growth of stems and leaves gradually slowed down, and the tubers began to expand rapidly, especially in the case of drought irrigation. The depth of irrigated potato fields is preferably 1/3 of the ridge height. The irrigation should be stopped half an hour before harvest. In the late stage of growth, the ridge soil should be prevented from being too wet, which will affect the expansion of tubers and the bad potatoes.

Second, nutrient management

The absorption of three factors of sweet potato growth was potassium, followed by nitrogen and phosphorus again. Fertilization is dominated by organic fertilizers, in particular, more potassium fertilizer is needed to prevent partial application of nitrogen fertilizers and avoid using chlorinated fertilizers. In particular, it is necessary to pay attention to re-applying “crack fertilizers” in the middle and later stages, and the amount of fertilizers accounts for about 45% of the total growth period. Phosphorus and potassium fertilizers are the main fertilizers for cracks, and appropriate amount of nitrogen fertilizer is used to prevent stems and leaves from being long and reduce tuber yield and quality.

1. Apply cracking fertilizer method. (1) Use 750-1000 kg of human and animal waste per acre, add 500 kg of water, and apply it at about 5 pm. (2) 500 grams of potassium dihydrogen phosphate per acre, first dissolved in a small amount of warm water, and then poured into 500 kilograms of clean water. (3) 2.5 kg of urea per mu and 10 kg of superphosphate are used. After the water is dissolved, 500 kg of water is poured.

2. Cracking fertilizer operation points. Action should be slow. After irrigation, cracks should be sealed with topsoil to reduce fertilizer evaporation and water evaporation. Really play the role of drought protection, security, increase production.

In addition, in the later growth stage, fertilizer can be applied extra-root, with 0.5% urea solution or 0.2% potassium dihydrogen phosphate solution or 2% to 3% calcium superphosphate solution or 5% plant gray water, 40 to 45 days before harvest. 2 to 3 times, each time a week, 75-100 kg per acre.

Third, weeding and vine

After ridge closure, weeds should be promptly weeded in the field, combined with earth and vines each time weeding. The method is: When the field is watered or rained, lift the stem by hand and move it to another place, so that the original leaf layer will not be disturbed, and the nutrients caused by the roots of the potatoes and the “turnover” of the potato pods will be reduced. Consumption.

IV. Pest Control

1. Agricultural control. Implement rotation; timely soil, to prevent the exposure of potato blocks, pay attention to the selection of light-victim varieties and land; sweet potato after the harvest, remove the insect block, stem vine, potato turn, etc., concentrated deep buried or burned.

2. Chemical control. (1) Control and kill tigers, cockroaches and other available poisonous baits to trap and kill, use 80% trichlorfon wettable powder 60 to 100 grams, first with a small amount of water, and mix 5 to 7 kg of sauteed cottonseed cake or rapeseed cake. . You can also use poisonous grass to seduce, take fresh grass 25 to 40 kilograms, smashed into 1.7 centimeters long, and 90% of trichlorfon 50 grams of water mixed evenly, in the evening sprinkled in the ground near the potato roots to kill. (2) Prevention of leaf-feeding pests. This period is prone to roll leaf moth damage. When leaf roller moths occur in large quantities, they can eat the leaves of plants and should be sprayed with 2.5% kungfu emulsifiable concentrate 5000 times before the larvae have reached their third instar stage. They can also be controlled by high-efficiency cypermethrin. (3) Individual plots of sweetpotato moth are serious and should be observed and found to be controlled in time. Spray 90% crystal trichlorfon 1500 times, or 50% phoxim, before 3rd instar larvae

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