To ensure proper wintering, rapeseed plants should develop a rosette of 8-12 leaves and a low root collar with the largest possible diameter before winter. To achieve such a shape, it is necessary to properly nourish the plantation, and one of the most important nutrients is nitrogen, which, however, has the disadvantage that if given in too large a dose, it may cause the opposite effect to that intended, and therefore make wintering more difficult by excessive growth of the plants.
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How much do nitrogen fertilizers cost at the end of July?
Nitrogen demand of rapeseed
Although the peak demand for nitrogen in winter rapeseed falls on early spring regeneration, when early application of a large dose of this valuable ingredient is crucial, it is also necessary shortly after sowing. During the autumn vegetation of this species, the demand for nitrogen is up to 100 kg/ha, but it should be borne in mind that a certain amount of this ingredient remained in the soil after the forecrop, and overfertilization is a definitely unfavorable phenomenon, therefore the dose of pre-sowing nitrogen fertilization should not exceed 40 kg/ha.
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Prices of NPK fertilizers at the end of July
Nitrogen is one of the key elements needed for the proper growth and development of plants, and thus preparing them for winter. The development of the root system and the growth of biomass depend on its dose. It is in this last issue that you should be particularly careful, as excessive development of the above-ground part may make it difficult to overwinter properly. We cannot forget not only about the soil's abundance of this element, but also about the nitrogen given to crop residues.
Various forms of nitrogen in fertilizers
Nitrogen in fertilizers can be available in three forms – ammonium, nitrate and amide. The key to effective fertilization is knowing when it is best to administer which of these forms to plants.
Ammonium nitrogen, in the form of the NH4+ cation, works effectively in conditions of good soil moisture, facilitates the uptake of phosphorus and stimulates the development of the root system, which is especially important at the beginning of the vegetation period. It is found in the composition of commonly used pre-sowing multi-component fertilizers, such as all types of NPK (e.g. Polifoska, Lubofoska, Amofoska, Ultra, etc.) or in ammonium phosphate, and partly in ammonium nitrates and nitrates.
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Nitrate nitrogen, also called nitrate nitrogen, is in the form of the NH3- anion, which before being used by plants must be converted into the NH4+ cation, known from ammonium nitrogen. This form facilitates the absorption of potassium, calcium and magnesium, but at the same time it is susceptible to leaching. It stimulates plants to intensive growth and development, which is why it is particularly useful during regeneration after winter. It is partly found in nitrates, ammonium nitrates and RSM.
Amide nitrogen, in the form of C-NH2, occurs mainly in urea, and also partly in UAS. A characteristic feature is the relatively slow action, associated with the need to convert first into the NH3- and then NH4+ form. Therefore, you cannot expect an immediate effect of fertilization, but once it appears, it will last for a relatively long time.
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The plague of counterfeit fertilizers in Ukraine, the market flooded with fakes
