At the germination stage of yam, the plant growth is small, and the absorption of nitrogen, phosphorus, and potassium is not large. It is only necessary to apply some fertilizer such as chitin and rooting agent to promote root development. After entering the vegetative stage, the plant grows faster, and the absorption of nutrients also increases, especially the demand for nitrogen fertilizer. The urea can be applied after the vine has been in the upper half of the shelf, 10-15 kg per mu.
When the vines are full, they will enter the tuber expansion period. We should pay attention to the combined application of nitrogen, phosphorus and potassium, especially the application of high-potassium fertilizers. The amount of nitrogen fertilizer should be controlled in the later stage of growth to prevent the vines from growing long and consuming nutrients. Chinese yam is a no-chlorine crop. Do not apply chlorine-containing fertilizers during top dressing. In the late growth stage of yam, 0.3% potassium dihydrogen phosphate solution or chitin can be sprayed on the leaves for 2 to 3 times to protect the leaves from premature aging.
The growth of yam beans requires a lot of nutrients. However, when the water and fertilizer supply is insufficient, and even under cloudy conditions, the nutrients and water in the yam beans will be transferred to the plants for growth. Therefore, it is not necessary to completely remove the yam beans.
After the yam stem vines climb to the top of the rack, they should be sprayed with plant growth regulators in time to inhibit the excessive vegetative growth, which can also play a role in reducing yam beans. For example, spray 15% paclobutrazol wettable powder 1500 times when the yam stalks climb to the top of the rack. If the plant grows vigorously, it can be sprayed every 7 to 10 days and continuously sprayed for 2 to 3 times.
In order to suppress the production of yam bean, it can be sprayed with Qudouling and Difazi at the early stage of yam bud blooming, spraying once every 10 days, and spraying 3-4 times in a row.
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