What fertilizer should be used for sweet potato and how to control the growth of sweet potato vine?

Sweet potato is one of the foods we often see in our life, and this kind of food has high nutritional value, delicious taste, and is loved by many people. But it is a great test of technology and experience to grow this kind of food on your own. Although sweet potato grows fast, proper fertilization can make it grow better.

What fertilizer is the best for sweet potatoes?

1. Base fertilizer

In order to achieve high yield, sweet potato must apply sufficient base fertilizer, mainly base fertilizer, supplemented by topdressing, and base fertilizer should be fully mature organic fertilizer and appropriate amount of chemical fertilizer. Generally, 2000 kg of high-quality mature farm manure (soil manure of chicken manure, cow manure and horse manure), potassium sulfate compound fertilizer and calcium superphosphate are applied per mu.

In addition to nitrogen, phosphorus and potassium, sulfur, iron, magnesium and calcium also play an important role. Among the three elements, sweet potato has the most requirements for potassium, followed by nitrogen and phosphorus. Therefore, increasing the application of potassium fertilizer, timely and appropriate amount of nitrogen and phosphorus fertilizer can significantly increase the yield.

2. Topdressing

After 7 days of planting, strong seedling fertilizer was applied, and ammonium bicarbonate was applied 5-8 kg per mu. One month after planting, strong plant fertilizer was applied, this time topdressing provided nutrients for the expansion of tubers, and the amount of topdressing was larger, 80 kg ammonium bicarbonate per mu. In addition, when planting sweet potatoes, we should pay attention to topdressing, that is, spraying some foliar fertilizer, which can be prepared by ourselves. 1.5 kg of urea and 0.5 kg of potassium dihydrogen phosphate are dissolved in 100 kg of water and sprayed into a solution.

How to control the growth of sweet potato vines

1. Topping

The first time when the main vine grows to 40 cm, the growth point of the main vine is removed; the second time, when the branch grows to 30 cm, the growth point of the branch is removed. In this way, the branches are increased, the stems and leaves are luxuriant, and the photosynthesis is enhanced, which shortens the distance of nutrient transport between roots, stems and leaves, thus promoting tuber expansion.

2. Tito

When the rattan leaves flourish and grow, lift them from the ground and place them in the same place without twisting the stems and leaves, disturbing the rattan leaf order or breaking the rattan leaves. This can inhibit the adventitious roots of stem nodes and the vigorous growth of rattan leaves, generally once every 10-15 days.

3. Spraying potassium

After the rattan leaves were sealed, 100 kg of water was foliar sprayed with 500 grams of potassium dihydrogen phosphate per mu, once every 10 days, twice in a row. It can also be 15-20 kg of plant ash to 50 kg of water, soak for 24 hours to remove the residue, spray in the afternoon of cloudy or sunny days, and apply 50-60 kg of leaching solution per mu. In this way, potassium spraying can promote the activity of root cambium and the synthesis and transport of carbohydrates, thicken the stems and leaves, thus prevent the rattan leaves from growing, which is beneficial to the expansion of potato blocks.

Seedling raising methods of Sweet Potato

1. Planting: potato cubes with moderate size (200-300 grams per tuber weight), neat and uniform, disease-free, wound-free and chilling-free should be selected for planting. The width of the seedling bed is 1-1.2m, and the length depends on the need. Generally, every 50kg seed potato can supply 0. 9-15000 seedlings, planting 3-4 mu, the average amount of seed used in the field is about 10-25 kg per mu, and the seed planting period is about 100 days before planting.

2. Raising seedlings: when the seedling length of potato seeds reaches 25-30 cm, the seedlings are pseudo-planted, and when the number of false-value seedlings reaches 6-10 nodes, the seedlings are peeled and topped to promote branching.

3. Fertilization: in the planned seedling collection period (before planting) 5-8 days, thin application of available nitrogen fertilizer to cultivate young and strong seedlings, and timely seedling planting when the length of potato seedlings reaches 25-30 cm.

Cultivation and management of sweet potato

1. Adjust the light: sweet potato likes light. Under the condition of sufficient light, the leaf color is thicker, the leaf age is longer, the stem vine is sturdy, the stem transport tissue is developed, and the yield is higher. But sweet potato seedlings are not too demanding for sunlight, because the walls are always covered with plastic tarpaulins, which are opened only at a later stage when the temperature is already high.

2. control humidity: sweet potato is a drought-tolerant crop, but too much and too little moisture is not conducive to yield increase. The growth of sweet potato seedlings needs to control good moisture. Sweet potatoes with too little moisture will be cooked because the temperature is too high. If the humidity is too high, it should be ventilated and sunburned. In short, the dry humidity of the soil should be observed regularly and strictly controlled at about 50%.

3. Control temperature: the most suitable temperature for sweet potato seedling growth is 20-25 degrees. If the temperature is lower than 20 degrees, the burning of firewood should be increased and the plastic tarpaulin should be covered. Above 25 degrees to reduce firewood, you can also uncover plastic tarpaulins to strengthen ventilation and cooling. Generally speaking, light a fire at the beginning of February, burn for about an hour in the morning and evening every day, and cease fire after 15-20 days, and the effect of temperature is basically small.

In many cases, people will find that sweet potato seedlings grow very vigorously, but the yield of sweet potato is not very high. This is to tell you that it is necessary to take proper care of sweet potato vines during planting, and it may even increase the yield.