How to control the overgrowth of potatoes in greenhouse

Spraying 60-120 mg / L zhuangsu on the leaves of potato from bud stage to flowering stage (the concentration at bud stage is the lowest) can inhibit the growth of aboveground part of plant, increase yield and increase the proportion of large and medium potato. From the budding stage to the early flowering stage of the plant, the foliar spray of 2000mg / L 2500mg / L solution, 50L / mu, can make the aboveground part grow strong, avoid excessive growth, form the tuber earlier, increase the proportion of large tuber and increase the yield. Spraying uniconazole solution with 30mg / L uniconazole solution on the leaf surface of potato during flowering period (that is, when potato lumps were enlarged) could shorten the internodes of stems and vines, the leaf color was dark green, the growth of aboveground parts was delayed, the growth of underground tubers was accelerated and the number of tubers was increased. When the height of potato plant is 25cm / 30cm, paclobutrazol is sprayed with 150 mg / L paclobutrazol solution, 240g / mu 15% wettable powder, or 14.4% EC 19.2 ml / mu, 40 liters of water, and sprayed evenly on the plant leaves with a sprayer to control the excessive growth of stems and leaves. Spraying 100mg / L paclobutrazol solution at the dosage of 50L / mu from the end of potato plant growth to potato fruiting stage can promote tuber hypertrophy, increase the proportion of large and medium tubers and increase yield. Attention should be paid to the selection of concentration before use, and the dosage should not be too large, so as not to affect the growth of the following crops.