Causes and solutions of rape seedling weak growth and low height

Now it is about to enter the spring ploughing, rape has also entered the bolting and flowering period one after another, at this time the main thing to do is to prevent low temperature chilling injury, but some farmers found that their rape is malnourished and does not grow high. What is the cause of this? How to solve it? Come and have a look with the editor.

1. stagnant water in the field

Rape growth is not tall, first of all, it should be suspected to be caused by stagnant water in the field, which will lead to poor root growth and insufficient absorption of nutrients, so it will be worse than the normal growth of rape seedlings. Especially on the inverted stubble rape field, this kind of situation is very easy to happen, the main reason is that the drainage ditch is not opened well, and there is no timely drainage after the Beginning of Spring, there is stagnant water in the field, and freezing damage can easily occur in case of low temperature, so we should pay special attention to it.

Solution: the first thing to do for the stagnant water in the field is to clear the ditch and drain in time to reduce the harm caused by the stagnant water, and spray potassium dihydrogen phosphate, multi-element micro-fertilizer and brassinolide on the rape field by means of foliar fertilizer to accelerate the growth of rapeseed. After that, appropriate topdressing and bolting fertilizer are applied to promote the normal growth of rape.

2. Lack of fertilizer

If the stagnant water in the field is excluded, it is very likely to be caused by lack of fertilizer. Rape is a crop that needs a large amount of fertilizer. Nitrogen deficiency will cause short plants, narrow leaves, yellow-green leaves, and serious leaves at the base of the stem will turn red. Phosphorus deficiency is caused by purple lower leaves and slow growth. Boron deficiency is not only the phenomenon of flowering but sterile at flowering stage, but also causes root dysplasia, root expansion and chapping, leaf edge curling purplish red and heart leaf yellowish brown at seedling stage.

Solution: supplement nutrient elements according to the color of rape leaves, pay attention to balance nitrogen, phosphorus and potassium fertilizer, and apply fertilizer reasonably according to rape growth. If the growth is not good before overwintering, apply wax fertilizer in time, the growth is good, boron fertilizer can be base fertilizer, if the base fertilizer is not applied, boron fertilizer can be sprayed at seedling stage, bolting stage and early flowering stage.

3. Rape root swelling disease

If the first two are excluded, then it is the harm of rape root swelling disease. In recent years, the occurrence of rape root swelling disease in the Yangtze River Basin has increased year by year, mostly from autumn to early spring, which is a neglected disease, especially farmers have little knowledge of the disease. In the early stage of the disease, the upper symptoms of the plant are not obvious, some rape leaves will appear yellow, the growth will slow down, pulling up the rape plant can see the fusiform tumor in the root. If rape grows slowly and the leaves turn yellow in the field, you can pull out a few plants and have a look, you can diagnose whether it is a root swelling disease.

Solution: when diseased plants are found to be removed in time, and the disease points are treated with quicklime, when the condition is serious, the rooting agent amine ester or 22.5% pyridoxil 35-45 ml / mu can be sprayed for 2-3 times every 7 days to control the disease.

The above are the reasons why rape seedlings are weak and not high, and the solutions are introduced. I hope I can help you. If you want to know more about it, please follow us.