What to Do About Early Senescence in Rapeseed? Latest Control Measures Explained in Detail

During the cultivation of rapeseed, early senescence sometimes occurs due to improper management. Once early senescence occurs, it causes a huge impact on yield, so farmers attach great importance to it. So what are the symptoms of early senescence in rapeseed? What should be done? Let's take a look at the detailed introduction.

1. Symptoms of early senescence

During the growth of rapeseed, if it shows an abnormal purple-green color, the new leaves are relatively small but very upright, the mesophyll tissue becomes thinner, and there is an obvious phenomenon of oxygen deficiency. The base of the stem is thin and weak, the stem skin is shriveled and appears blue-purple, and its growth rate slows down noticeably, mainly shown as slower leaf emergence. According to measurements, when rapeseed enters the reviving stage, generally a new leaf only needs 8-10 days to grow out, while for weakened plants it takes 15 days. This not only delays the growth of rapeseed but also affects its final yield.

2. Causes of early senescence

The reason rapeseed develops early senescence is that nutrients are not supplied adequately. Rapeseed is a nitrogen-demanding plant. In early spring, when the temperature rises, its growth rate accelerates. If there is not enough fertility to support its growth at this time, it will develop early senescence due to insufficient nutrients. In addition, excessive field humidity is also a cause of early senescence. In fields that are wet for a long time, the root system of rapeseed turns black, root hairs fall off, the ability to absorb water and fertilizer is weak, growth is hindered, and the aboveground part shrinks due to long-term lack of nutrients, leading to early senescence.

3. Control measures

During rapeseed cultivation, the supply of fertilizer should be increased, especially in spring when the temperature rises, as this is the period of fastest growth and is related to the later yield. Generally, fertilization begins in February, mainly with nitrogen fertilizer in the early stage, combined with phosphorus and potassium fertilizer, to promote the start of rapeseed growth. Of course, in addition to fertilizing, field humidity should also be properly controlled, paying attention to the number of waterings and the amount of water applied. A single watering should not be too much, so as to avoid water accumulation in the field. After rain, drainage should be carried out in time to avoid root soaking, which can cause root rot and death and loss of absorption capacity.

The above is an introduction to control measures for early senescence in rapeseed. We hope it can help you. If you want to learn more related knowledge, please keep following us.