Causes of the emergence of tall seedlings in the latest cucumber and its control methods

In the process of cucumber seedling cultivation, after the seedlings are unearthed, attention should be paid to forging seedlings. The seedbed should be kept humid and should not be watered too much. At the same time, ventilation conditions should be strengthened to avoid the formation of high temples. So how to prevent cucumber high-legged seedlings? Let's take a look at it together with Xiaobian.

1. Symptoms

Tall seedlings have large leaves, thin leaves, light color, thin and long stems, large internode spacing, and short and small roots with less dry matter accumulation. Because the root system is weak, its fertilizer and water absorption capacity is weak, the stems and leaves are tender, the surface cuticle is not developed, once the air humidity is reduced, transpiration is intensified, and then the leaves will wither. The resistance of tall seedlings is poor, and they are easy to be frozen and infected with diseases. Because of malnutrition, flower buds of tall seedlings are formed slowly, flowers are few and late, and abnormal fruits are often formed, flowers are easy to drop, and the yield is low.

2. Causes of occurrence

The formation of tall seedlings was mainly caused by low night temperature, small temperature difference between day and night, insufficient light, poor ventilation, excessive water, excessive nitrogen fertilizer application, insufficient phosphorus and potassium fertilizer application, etc. Because of poor ventilation conditions, seedlings did not ventilate in time when they first emerged, and they would cause excessive growth in contact with mulch. At this time, seedlings were more sensitive to temperature, and it was easy to cause hypocotyl elongation under high temperature conditions. Then before planting, the outside temperature gradually increased, the weather became warmer, and the seedlings grew faster. At this time, the plants crowded with each other, blocking light from each other and causing tall seedlings.

3. Prevention and control methods

First of all, the proportion of nutrient soil in the construction of seedbeds should be reasonable, organic fertilizer and pastoral soil can be mixed, organic fertilizer should be fully decomposed, pastoral soil should not be selected for planting melon vegetables, so as not to infect diseases and insect pests, and at the same time, it should be sieved. After the seedlings are unearthed, the humidity and night temperature of the seedbed should be kept between 15-20 degrees in the first half of the night, 10-15 degrees in the second half of the night, not lower than 5 degrees in the morning, and a certain temperature difference between day and night should be maintained. When the seedlings grow excessively, they can be sprayed with 50% chlormequat 2500-3000 times solution. After spraying for 10 days, the seedlings will grow slowly, the leaves will become dark green, and the stems will become strong.

The above is the introduction of the reasons and control methods of cucumber high-legged seedlings. I hope it can help you. If you want to know more about relevant knowledge, please pay attention to us.