Urea the most concentrated nitrogen >fertilizer. Nitrogen content about 46%.
Efficiency of urea used as the main fertilizer, nothing is inferior to the well-known ammonium nitrate. At the same time, it is urea that contains the largest amount of nitrogen, which ensures high expediency of its use.
The amide form of nitrogen of this fertilizer is not washed out of the soil, this fact is very important when used in areas with abundant moisture and areas of irrigated agriculture .
Recommended application rate:
For cabbage, turnip, beets, tomatoes, peppers, potatoes - 20-25g/m²
For cucumbers, peas - 5-8 g / m².
For feeding strawberries, tomatoes, cucumbers, cabbage - 20-30 g per 10 liters of water, watering at the rate of 1 liter for each plant. For feeding currants before bud break - 20 g per 10 l of water, gooseberries - 10 g per 10 l of water before bud break and 10 g per 10 l of water during shoot growth. When sowing in rows, 2.5-4 g of fertilizer per hole with the obligatory mixing of the fertilizer with the soil. Composition: nitrogen - not less than 46.2%
Urea is applied over the entire projection of the crown of trees and shrubs. It is recommended to apply 200-250 g of urea under a fruit-bearing apple tree, 120-140 g under cherries and plums. Urea can be applied by scattering it over the surface, then it should be watered abundantly. It can also be applied in dissolved form, but watering is also required in this case.
Due to the fact that carbamide acidifies the soil, it is neutralized with limestone (0.8 kg of ground limestone per 1 kg of urea). 100-150 g of urea is added per 10 m2. Two-thirds of the fertilizer is applied during processing and one-third is gradually applied for top dressing during the growth period.
Proportion of the formation of a liquid solution: 50-70 g of urea per 10 liters of water and consumed per 10 m of sowing. For fertilizing adult plants under the root, this amount is enough for 20 tomato plants or 50 cucumber plants.
For foliar nutrition, 100 g of urea is dissolved in 10 liters of water; this solution is used for 100 m of sowing or planting.
When urea is mixed with simple superphosphate, it is neutralized (first, ground limestone or chalk is added to superphosphate, and only then fertilizer) in relation to 100 g of limestone (or chalk) per 1 kg of superphosphate.
The advantage of urea, compared to ammonium nitrate, is that it burns plant leaves less, so carbamide is recommended for foliar top dressing of plants.
When signs of nitrogen starvation appear, foliar top dressing of plants is carried out. The need for foliar top dressing may also arise immediately after the formation of ovaries of fruits and berries and their subsequent shedding. Foliar top dressing is carried out with a manual sprayer in the morning or evening. The fertilizer solution is prepared at the rate of 30-40 g of urea per 10 liters of water.
When using organic fertilizers for trees and shrubs, the doses of urea are reduced by one third or half, depending on the amount of organic matter applied. Fertilizer doses are also reduced by half on young plantings and when fertilizing still infertile trees and shrubs.
Urea cannot be mixed with simple superphosphate, lime, dolomite, chalk.
In addition to the fact that urea can be used as a fertilizer, it is also actively used as a pest control agent: still in the wintering stage: aphids, suckers, weevils, apple flower beetle. Use spraying with a concentrated solution of urea (500 - 700 g per 10 liters of water). This treatment is done if there were a lot of pests in the previous year.
and also as a means to protect plants from diseases such as: monilial scorch, purple spot and scab.
- spraying urea can be carried out in the fall, at the beginning of leaf fall with a 5% solution (500 g), it is recommended to spray apple trees, in which the leaves are severely affected by scab. Urea, penetrating inside the leaves, reduces the ability of the pathogen to form fruiting bodies, which cause primary infection of the apple tree in the early spring. Instead of spraying the leaves on the trees, it is allowed to treat the fallen leaves of the apple tree with a 7% solution of urea (700 g) either in the fall after leaf fall or in early spring before the buds open. For every 10 sq. m. 2.5 liters of solution are consumed.
