Causes and preventive measures of uneven emergence of watermelon

Now it is time to raise watermelon seedlings, but many farmers report that their seedlings do not come out evenly. When they raise seedlings in the hole tray, there will be uneven emergence of melon seedlings in the outermost hole tray of the seedling bed. What is the reason for the uneven emergence of watermelons? Let's get to know it with the editor.

1. Reasons for uneven emergence of seedlings

1. The temperature is not suitable

Watermelon is a heat-tolerant crop, which requires higher temperature in the whole process of growth and development. the lowest temperature for its growth is 10 degrees, the highest is 40 degrees, and the suitable temperature is between 25 and 30 degrees. If the ground temperature is too low, it will affect the root development of watermelon, nutrition can not meet the normal growth and development needs of melon seedlings, then the phenomenon of uneven seedlings will appear.

2. Soil consolidation

The hardening of the seedbed and the poor air permeability will cause the oxygen content in the soil to sow, which will cause the slow growth of the seed embryo and delay the germination. At the same time, the hardening of the seedbed soil will also increase the difficulty of the top soil of seed germination, so it will cause the emergence of seedlings slowly and form uneven emergence.

3. Large amount of fertilizer

The amount of fertilizer application is too large and concentrated, so that the root system can not plant or burn roots, and can not absorb fertilizer and water, which affects the growth, or the application of base fertilizer is too deep, the upper layer fertilizer sowing, will also appear the phenomenon of uneven seedling. In addition, watermelons like wet, drought-tolerant, but not waterlogging, when the soil moisture is too high will cause retting roots, can not absorb nutrients, its growth will be slow. When the soil is dry, it can not meet the supply of fertilizer and water, which will lead to uneven seedling emergence.

4. Root nematode

Watermelon root nematode only harms the roots, especially the young parts of the root system, and the roots damaged by root nematodes will grow nodule-like roots of different sizes and shapes, which hinder the absorption of nutrition and water by the root system, and the supply of nutrition and water is low. It is easy to appear the phenomenon of uneven seedlings. And when the root nematode is harmful, it will also form a wound, from which a large number of bacteria invade and do harm together with the root nematode.

II. Preventive measures

First of all, the seedlings with strong disease resistance should be sown in disease-free soil and disinfect the seedling bed before planting. It is to strengthen field management, increase the application of rotten organic fertilizer, increase the content of soil organic matter, promote the growth of new roots, and enhance the disease resistance of plants. At the same time, it is necessary to prevent the hardening of the seedbed, pour enough bottom water, no watering or less watering in the seedling period, and prevent rain in the rainy season. Ploughing should be carried out before planting, and flood-drought rotation can be carried out in the fields with serious soil-borne diseases. In order to prevent watermelon root nematodes, farmers can apply Yinghui nematode killing agent Ligan sand granules in ditch, hole or whole field before watermelon transplanting.

The above are the reasons for uneven emergence of watermelon and preventive measures, hope to help you, want to know more related knowledge, please pay attention to us.