/15 April 2022

Foliar feeding of rapeseed

Farmers’ interest in rapeseed is growing, as it is the first solid money of the season, so needed to get prepared or the harvesting and autumn sowing. In addition, this culture is in demand in foreign markets and its price remains at a good level from year to year, which gives some hope for income stability.

In European countries, winter rape is mainly grown, whereas, for example, in China, Canada and Australia – spring rape. Today, in terms of production in our country, rapeseed is the third most important oilseed crop, behind sunflower and soybeans.
The expansion of the area under rapeseed crops primarily takes place because of its being considered a valuable precursor for other crops in terms of agricultural technology. On the one hand, its root system provides loosening of the soil to a considerable depth, on the other – the green mass of plants overshadows it for a long time, which affects the structure of the soil. Growing cereals after rapeseed increases the yield by 3-4 kg/ha, which in fact increases the efficiency of all crop production without any additional costs.The special value of rapeseed is that due to the developed and deeply penetrating root system, it absorbs nitrates, preventing them from entering groundwater.
When growing rapeseed, farmers pay attention to weeds, pests and diseases in the first place. In the fight against them, protection technologies are are worked out and reliable PPP (Plant Protection Product) is used, which helps in obtaining high yields. Therefore, sometimes the power system is relegated to the background, which can significantly affect yields.

Autumn foliar fertilization of winter rapeseed plants is needed to ensure the formation of a strong root system and accumulation of sugars for successful overwintering, as well as to balance the conditions of mineral nutrition at the beginning of the productivity elements formation, which occurs mainly in autumn. The process of differentiation of generative organs in winter rape plants takes place when the plants are in the rosette phase (6-8 leaves).

Balanced mineral nutrition and longer laying of buds at the top of the root collar provide higher yields.
Winter rapeseed lays 70% of future yields in autumn, before the onset of winter dormancy. And because rapeseed is a typical borophyll and sulfur-loving, foliar fertilization in the autumn rosette phase with readily available compounds of boron, phosphorus, sulfur and other mineral nutrients is a necessary element in yield management. In particular, acute boron deficiency in autumn may lead to inhibition of growth and development of the root system, insufficient development of leading bundles, growth points, reduced accumulation of sugars and their transporting to the root collar. It also impairs frost, winter hardiness and overwintering in general, leading to deformation and hollowness of the rape root system. Therefore, the tank mixture for fertilizing winter rapeseed crops in the fall includes:

● Magnesium sulfate Wonder Leaf MgS 16-32 (5-10 kg / ha) or Wonder Leaf MgS 25-50 (3-4 kg / ha);
● Wonder Leaf Mono P 30 (1-2 l / ha);
● Wonder Leaf Mono B 11 (1-2 l / ha).

The next feeding is carried out in the spring, during the formation of leaf rosettes and stems. During this period, special attention should be paid to providing plants with boron. Without the application of boron fertilizers, it is impossible to get a harvest of more than 3 t / ha. When boron deficiency is observed in crops, growth is inhibited in plants, chlorophyll production by young leaves decreases, the percentage of new pod formation and the number of seeds in pods is significantly reduced, and the already formed pods begin to fall off. On soils insufficiently supplied with boron, the yield of rapeseed increases after the application of this micro fertilizer. The introduction of molybdenum is also relevant. Under the action of this micro fertilizer plant yields increase significantly, the content of crude protein in seeds increases.
Manganese introduced in the spring activates the action of some enzymes in plants, affects the synthesis of proteins and carbohydrates, improves the absorption of nitrogen by rapeseed, regardless of its formulation. It is worth remembering that by adding micronutrients to rapeseed, you can get a yield increase of 4-10% from boron, 4-7% – from molybdenum and 5-20% – from manganese.
In the phase of spring rosette-stemming, new leaves, shoots and flowers are laid, as well as potential yields. To fertilize crops in this period, we recommend:
● Urea (7-10 kg / ha);
● Magnesium sulfate Wonder Leaf MgS 16-32 (5-10 kg / ha) or Wonder Leaf MgS 25-50 (3-4 kg / ha);
● Wonder Leaf Yellow (2-3 kg / ha);
● Wonder Leaf Mono B 11 (1-2 l / ha).

The last feeding is carried out at the stage of fruit and seed formation. Its goal is to improve the quality of products grown. In order to achieve this, the company “Wonder” offers the following tank mix:
● Magnesium sulfate Wonder Leaf
●MgS 16-32 (5-10 kg / ha) or Wonder Leaf MgS 25-50 (3-4 kg / ha);
● Wonder Leaf Red (2-3 kg / ha);
● Wonder Leaf Micro (2-3 l / ha).

To eliminate the risks caused by abiotic factors, we recommend adding Wonder Leaf Amino 43 – 0.5-1 l / ha to the tank mix.

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