The Latest Methods for Identifying Nutrient Deficiency Symptoms in Rapeseed Cultivation

Rapeseed is one of the important oilseed crops in our country, and both the tender rapeseed shoots and the budding rapeseed flowers can be eaten as vegetables. Rapeseed has strong resistance and is grown throughout our country, but mainly in Anhui, Henan and other places. However, when we grow rapeseed, there are inevitably some shortcomings in our fertilization techniques. So today, the editor will tell everyone about the symptoms that appear when rapeseed lacks nutrients, and how we should remedy the situation after nutrient deficiency.

I. Symptoms of Nutrient Deficiency

The symptoms of nutrient deficiency in rapeseed are mainly divided into four types. When different types of nutrients are lacking, the symptoms shown are also different, and naturally the remedy measures will also differ. The four types of nutrient deficiency symptoms in rapeseed are: nitrogen deficiency, phosphorus deficiency, potassium deficiency, and boron deficiency. Let's take a look below.

1. Nitrogen deficiency

Nitrogen fertilizer is mainly used to promote the growth of rapeseed plants, and its critical fertilization point is from bolting to early flowering. If rapeseed lacks nitrogen fertilizer, the plants grow slowly, are short and small, with few branches, and the weight and number of seeds per pod and rapeseed seeds will decrease. Secondly, the leaves of rapeseed are thin and small, with a pale color, sometimes even appearing red.

2. Phosphorus deficiency

If rapeseed lacks phosphorus fertilizer, the root system of the rapeseed plant is underdeveloped and relatively small. Secondly, the leaves of rapeseed will not be very large either, the leaves are relatively thick, and the leaf color is relatively dark, usually appearing dark green or even dark gray. When phosphorus fertilizer is severely deficient, the leaves are very likely to turn dark purple and show symptoms of wilting. Finally, another symptom is that the flower bud differentiation speed of rapeseed is relatively slow, which seriously affects the optimal fruiting period of rapeseed.

3. Potassium deficiency

When the rapeseed field lacks potassium fertilizer in the early stage, the leaves at the bottom of the rapeseed plant will gradually show yellowing. Of course, special cases cannot be ruled out; sometimes the bottom leaves will curl, wither, and the stems will show obvious signs of breaking due to stem wilt disease. Secondly, the flowering of rapeseed buds is abnormal, and the growth and development period is prolonged, which will cause rapeseed to miss the optimal time for yield and quality.

4. Boron deficiency

Rapeseed is very sensitive to boron fertilizer, so once boron fertilizer is lacking, symptoms can be found in the rapeseed plant. Especially during the late flowering and fruiting stages, the symptoms of boron deficiency are most obvious. If boron fertilizer is lacking during the flowering and fruiting period, the phenomenon of flowering without fruiting will occur, which will seriously affect the yield of rapeseed.

II. Fertilization Techniques and Remedy Measures

In order to avoid nutrient deficiency in rapeseed, we first need to apply heavy base fertilizer, and then scientifically apply additional fertilizer. For example, apply seedling fertilizer early and in increased amounts, apply bolting fertilizer steadily, apply flower fertilizer skillfully, and apply seed fertilizer as a supplement. So when nutrient deficiency occurs in rapeseed, we need to take timely remedy measures. If it is nitrogen deficiency, then about 5—10 jin of urea should be applied per mu. If phosphorus is deficient, then 8—10 jin of calcium phosphate should be applied per mu. If potassium is deficient, then 10—15 jin of potassium sulfate and about 400 jin of plant ash should be applied per mu. If boron is deficient, then about 200 grams of borax should be applied, mixed with water for foliar spraying.

The above is what the editor wants to share with everyone today: the analysis of nutrient deficiency symptoms in rapeseed, its correct fertilization methods, and remedy measures after nutrient deficiency. We hope it can help everyone. If you want to learn more about rapeseed cultivation, remember to follow us.