Causes and solutions of red leaves of rapeseed

Rape is not only a common vegetable, but also one of the main oil crops in China, which is the source of household income for many farmers, but there will be a large area of rape red leaves when planting. What's going on? Let's take a look at the causes and solutions of rape with the editor.

1. Lack of fertilizer

If the planting density of rape is high at the seedling stage, the leaves of the seedlings will turn red because of the lack of nutrition. when there is a lack of nitrogen, the plant will be short, the new leaves will be born slowly, the leaves will be small, and the leaves will form yellow-red leaves; phosphorus deficiency will lead to slow plant growth, small leaves and purplish red leaves; boron deficiency will lead to expansion and blue-red spots on leaves.

Solution: reasonable close planting and time seedlings, thinning, weak and strong seedlings, timely topdressing after interseedling, nitrogen deficiency can be applied 8-10 kg urea or 20-30 kg ammonium bicarbonate per mu, and urea solution can be sprayed to keep nitrogen element in the later stage. 25-30kg calcium superphosphate per mu was applied when phosphorus was deficient, and calcium superphosphate solution was sprayed in the later stage. When boron was deficient, 100 grams of borax was sprayed with water per mu.

2. Drought

If rape grows in a dry climate, the soil moisture is seriously insufficient, which will lead to the weakening of water absorption and fertilizer absorption of roots, resulting in short plants and light red leaves.

Solution: for the weather that has been dry for a long time, it is necessary to water and irrigate in time to avoid the phenomenon of red leaves, but when watering, we should pay attention to not flooding, so as to avoid dead seedlings.

3. Stagnant waterlogging

When there is drought, there will be red leaves of rape, too much Rain Water or poor soil drainage to form waterlogging, which will lead to red leaves of rape, rotting roots and dead seedlings.

Solution: select the land with high terrain and good drainage, drain in time after the rainy season, loosen the soil at the same time, maintain the soil permeability and promote the growth and development of the root system.

4. Freezing injury

When rape meets sub-zero temperature, its root absorption will be weakened, resulting in physiological lack of fertilizer, resulting in the hindrance of chlorophyll production in leaves, the emergence of a large amount of anthocyanins, resulting in purplish red leaves. It is common to cause rape leaves to turn red during low temperature freezing injury in the north.

The solution is to choose varieties with strong cold tolerance, and low temperature is a collection of measures such as ploughing, soil cultivation and increasing application of organic fertilizer to reduce the freezing injury of the plant and make it grow normally.

The above is the introduction of the reasons and solutions of rape red leaves. I hope I can help you. If you want to know more about it, please follow us.