Symptoms and control methods of boron deficiency in rapeseed

Rape has a wide planting area in China, and it is extremely sensitive to boron. Boron deficiency will seriously affect the yield of rapeseed, while boron deficiency is widespread in most soils in China. Therefore, the application of borax in planting has an obvious high incidence of rape, so what are the symptoms of boron deficiency in rape? How to prevent and cure it? Let's take a look.

1. Symptoms of boron deficiency

In the seedling stage, the boron deficiency seedlings will appear dark green leaves, shrinking leaves, fuchsia spots in the later stage, leaves will fall off ahead of time, and sometimes dead seedlings will appear seriously. When bolting, boron deficiency will appear that the leaf edge turns red, the leaf is thick and brittle, the top of the main stem is fed, sometimes the stem crack occurs, the bud will develop abnormally, and even dry up and fall off. Boron deficiency in florescence will lead to obvious dwarfing of inflorescence, atrophy of tip, delay of flowering, shedding of a large number of buds, deformity of young fruit, and even pod extinction. Boron deficiency in fruit stage will appear flowering and sterile phenomenon, pods do not bear seeds or weak seeds and deformed seeds, the size of seeds is uneven.

2. Causes of boron deficiency

First of all, boron deficiency is suitable for soil, and the poor water retention of soil is that boron is easily lost, resulting in boron deficiency; in addition, it is also related to environmental factors, according to studies, the absorption of boron by plants decreases with the weakening of light intensity, and in drought, the transport of boron is hindered, which will also lead to boron deficiency, and boron will be lost when the water content is high. Boron and nitrogen, phosphorus and potassium restrict each other, when the content of nitrogen in plants is similar, they will absorb boron to balance. Generally, plants with boron deficiency will find that nitrogen is higher than normal plants, and boron deficiency will affect the absorption of phosphate fertilizer by plants. but it can promote the absorption of potash fertilizer. Therefore, potassium fertilizer should not be applied when the plant is boron deficient, so as not to aggravate the symptoms of boron deficiency.

3. Prevention and control methods

Before sowing or transplanting rape, apply an appropriate amount of borax, which can meet the demand for boron during the whole growth period of rape. Generally, 1-2 jin of boron fertilizer per mu can be applied together with the base fertilizer. In seedling stage and bolting stage, the method of foliar fertilizer spraying can be improved to supplement the plant's demand for boron. Generally, extremely low concentration borax solution is sprayed once at seedling stage, bolting stage and flowering stage. It is necessary to apply nitrogen, phosphorus and potassium fertilizer reasonably when topdressing, not to apply any kind of fertilizer, to increase the content of boron in soil, to water in time in drought and to drain in time in rainy season.

The above is the rape boron deficiency symptoms and prevention and treatment methods, hope to help you, want to know more related knowledge, please pay attention to us.