In the late stage of sweet potato growth, it is necessary to do a job of topdressing, chemical control, drainage, pest control.
1. Prevent stagnant water. Drain the drainage ditch in advance and remove the accumulated water in case of heavy rain.
2. Control is prosperous. If the sweet potato is ridged, if it continues to grow, it can use 50-70 grams of paclobutrazol, spray 50 kilograms of water, and usually spray 2 times, about 2 weeks apart. In the sweet potato expansion period, spray 20 ml per mu, and control the increase, which can increase the yield of fresh potatoes. Note that the sweet potato should not be turned over after the ridge is closed, so as to avoid disrupting the leaf layer structure and reducing production. It can be used to control the roots and control the roots.
3. Timely topdressing. Potassium has the greatest impact on sweet potato yield, followed by nitrogen and phosphorus. After entering the potato block for a long time, it is necessary to increase potassium fertilizer appropriately, and apply 3 kg of potassium sulfate and 4 to 5 kg of urea per acre.
4. Spray surface fertilizer. In the sweet potato expansion period, the effect of spraying the leaf surface fertilizer is obvious. The aqueous solution of potassium nitrate 200 times solution (or 2.5% potassium sulfate, 0.3% urea) can be sprayed on the leaves, once every 5 to 7 days, and even sprayed 2 to 3 times.
5. Treatment of pests and diseases. In the late growth stage of sweet potato, attention should be paid to the control of leaf-eating pests such as sweetpotato hawkbill and leaf roller moth, which can be controlled by 5% cypermethrin 1500 times spray; 40% carbendazim 100 times solution was used to control sweet potato black spot disease. (Linglan)
Corrugated Apvc Roof Sheet,Anti-Chemical Corrugated Apvc Roof Sheet,Upvc Corrugated Roofing Sheet,Pvc Corrugated Roof Sheet
ZHENHAO BUILDING MATERIALS CO.,LTD , https://www.nbpvcroof.com