Causes and control methods of stiff seedlings in rapeseed

Rape is a common vegetable, it can not only extract oil, but also delicious vegetables, high economic value, planted all over the country. It occasionally appears the phenomenon of rigid seedlings in planting, when the phenomenon of rigid seedlings occurs, rape stops growing, seriously withered stems and rotten roots, reducing yield. So why are there stiff seedlings? The following editor brings you the prevention and treatment of stiff seedlings.

1. Drought and waterlogging damage

Climate and soil drought will not only lead to lack of water, lead to plant wilt, but also affect the absorption of nutrients by roots, appear symptoms of element deficiency, cause leaves to turn purple and red, and cause stiff seedlings. After transplanting, the soil drained well and encountered long-term overcast and rainy weather, which led to excessive soil water accumulation, waterlogging damage, difficulty in root breathing, hypoxia and stiff seedlings.

Prevention and control methods: stiff seedlings caused by drought can be solved by ditch irrigation or watering. Ditch irrigation can dig a ditch between rows and irrigate to 2/3. Watering can better control moisture. Regular watering can keep the soil moist. For the stiff seedlings caused by waterlogging, it is necessary to timely drain and prevent waterlogging, especially in overcast and rainy weather, combined with ploughing and loosening the soil to maintain the soil permeability and make the root respiration normal.

2. Lack of fertilizer

When the plant is growing, it lacks fertility and cannot grow normally, causing stiff seedlings. Generally, stiff seedlings caused by lack of fertilizer can be easily identified. First of all, the plant is shorter than the normal plant, the leaf color is faded green and yellow, and when the stem base leaf is red and purple, the leaf is withered and yellow, which represents the nitrogen deficiency of the plant. If it is the upper part of the leaf dark green without luster, the lower half of purple red, it is phosphorus deficiency, there are many symptoms of element deficiency will not be introduced one by one.

Prevention and control methods: lack of fertilizer should be fertilized to supplement nutrition, apply sufficient base fertilizer before transplanting, base fertilizer can choose to use completely mature organic fertilizer with nitrogen, phosphorus and potassium fertilizer, the elements of organic fertilizer are very comprehensive, the application of enough organic fertilizer generally will not appear deficiency symptoms. When there are stiff seedlings caused by lack of fertilizer, it is necessary to apply fertilizer in time, combined with foliar spraying, the effect is excellent, and the plant can resume normal growth and development as quickly as possible.

3. Diseases and insect pests

The common pests that lead to rigid seedlings are aphids, and the larvae gather in the leaves of the seedlings and suck the sap of the leaves, causing the leaves to wither and curl, and finally the plant shrinks, but the leaves turn yellow and the heart leaves do not expand, but the root growth is caused by the poor photosynthesis of the leaves and the slow synthesis of nutrients, which can lead to the harm of virus diseases and the formation of rigid seedlings.

Prevention and control methods: to do a good job in the prevention and control of aphids, we can use 3000 times liquid spray to control aphids when aphids are harmful, and if there are symptoms of virus disease, we can use 3000 times liquid spray once a week for 2-3 times in a row.

4. The seedlings are too bad.

During the period of sowing and raising seedlings, because the sowing density is high, the seedlings are not carried out in time after emergence, or the seedling age is too old when transplanting, it will lead to the formation of tall seedlings after transplanting, and the seedlings will grow with fewer leaves and stop growing.

Prevention and control methods: pay attention to the density when sowing, after emergence, according to the reasonable density between seedlings, supplement seedlings, select the appropriate age when transplanting, remove diseased seedlings and weak seedlings. After transplanting, there is also the phenomenon of Gaojiaomiao, which can strengthen ploughing and weeding, combined with fertilization to promote its growth.

The above are the causes and control methods of rape stiff seedlings. I hope I can help you. If you want to know more about rape planting, please follow us.