When will the beans be topdressing in the latest greenhouse

Planting beans in greenhouse can be cultivated in early spring or postponed in autumn, which can reduce a lot of diseases and insect pests. So many people choose to grow beans in the greenhouse. Greenhouse planting and fertilization, although also according to the growth period, but the amount of fertilizer is much less, the fertilization system is different, and it is easy to cause fertilizer damage. Therefore, when topdressing, pay attention to the time, reasonable fertilization.

1. Fertilization time

The greenhouse does not apply fertilizer on sunny days, but it can also be applied on cloudy days and rainy days. There is not much water to enter the greenhouse, which just dissolves fertilizer and will not burn roots. After one fertilization, the interval can be longer, do not fertilize with yellow leaves, regardless of the time interval, it may be for other reasons. Seedling stage greenhouse seedling tray seedling or direct seedling, seedling growth up to 4 cm can be applied light fertilizer water; colonization of soil base fertilizer; during the growth period can be topdressing once; after pod fertilization in batches.

2. Fertilization method

After seedling emergence, the seedling height of 4 cm can be applied with light fertilizer and water, and the leaching solution of farm fertilizer can be sprayed on the soil surface after mixing with water. You can spray it a few more times. Planting base fertilizer, about 100 jin to 150 jin of farm manure is applied to a greenhouse. Then apply 20 jin of calcium superphosphate and 30 jin of compound fertilizer. Turn directly into the soil and mix the soil. Before topdressing a pod, topdressing compound fertilizer once, about 20 jin, to promote the growth of plants. After setting pods, they all bear pods in batches, so it is necessary to topdressing many times, a small amount and many times, about 10 jin at a time.

3. Characteristics of fertilizer requirement

A lot of phosphorus and potassium are needed in the growth of beans, especially at the beginning of pods, phosphate fertilizer is easy to be fixed and difficult to absorb, so the earlier fertilization is, the better. Potash fertilizer should also be applied in the early stage, in order to grow roots, but mainly in the late podding period. And may have to be applied many times to ensure smooth pod setting.

4. Points for attention

Due to the restrictions on fertilization in the greenhouse, it is easy to accumulate in the soil, there is no absorption and use of substances, there is no Rain Water cleaning, greenhouse watering is relatively less, it is easy to accumulate harmful substances. Then fertilizer must be paid attention to every time the right amount, can not be used too much. Fertilization must be drip irrigation, constantly dissolve, do not accumulate. The water droplets in the shed should be wiped off and must not fall back into the soil.

When planting beans in greenhouse, we should pay attention to the right time, apply the right amount of fertilizer, and apply fertilizer according to the fertilizer characteristics of beans. Attention should be paid to the problem of fertilizer damage in fertilization.