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Urea, or urea, is a chemical compound, carbonic acid diamide. The substance is represented by white crystals, soluble in polar solvents in the form of water, ethanol and liquid ammonia. If it is necessary to share urea with other fertilizers, it is imperative to take into account pH indicators.
This amide-form fertilizer is the most concentrated nitrogen-containing fertilizer known. The granular form has excellent physical characteristics, including lack of caking and preservation of friability even after prolonged storage. Perfect for root and foliar top dressing, and also part of the most effective complex dressings.
Urea, when introduced into the soil, dissolves and turns into ammonium carbonate, which is an unstable compound that decomposes in air to ammonium bicarbonate and ammonia. The resulting ammonium is gradually absorbed by horticultural crops, after which no acid or alkaline residues remain.
Indications for use
Urea is recommended to be used as the main fertilizer on any type of soil and under a variety of fruit plantations and vegetable or green crops in the garden. As a rule, urea is used in the following cases:
- nitrogen starvation, which is manifested by a lag in growth and development, yellowing of leaves, weak flowering, lack of ovaries;
- insufficient fruit formation, as well as a deformed appearance of the fruit or shedding.
How to treat a garden with urea
Garden treatment and top dressing of garden crops should be carried out in the morning or evening hours. The standard instruction for preparing the solution involves dissolving 30-40 g of urea in 10 l of water. Features of application, consumption rate depend on the type of soil.
Preference should be given to the introduction of urea against the background of active irrigation
Urea and urea are equivalent in terms of the main application
Neutral and alkaline soils
In order to increase efficiency and reduce losses of nitrogen-containing components, immediate sinking into the soil and irrigation is carried out
It is important to remember that spraying fruit and berry plantings with urea can slow down the growing season, which helps protect the ovaries from death in early spring. That is why such an event is recommended as one of the mandatory when cultivating early ripening stone fruits. Spring treatment of garden plantings against diseases and pests with urea must necessarily be carried out in a timely manner.
Preparation for processing and processing
During spring flowering, apple, plum and pear plants are recommended to be treated with urea. Such an event is very effective for the prevention of damage to garden plantings by caterpillars of leaf moths, aphids, tinnitsa and apple blossoms. Before the treatment should be properly prepared plants.
Immediately prior to processing, sanitary pruning is required and all diseased or diseased areas of the cortex are removed by scrubbing them with a spatula or wire brush. Such preliminary preparation will be able to provide in the process of spraying direct contact of the solution with the affected area or the accumulation of insect pests.
For the most effective destruction of plant parasites and diseases, it is necessary to use a concentrated solution. To prepare the working solution, 0.5-0.7 kg of urea should be diluted in 10 liters of water. Experienced gardeners recommend conducting spring spraying in the first decade of March, and in the last days of the month. It is important to remember that the second treatment is carried out with a less concentrated solution, which will protect the foliage from burns.
Fertilizing garden plantings
Urea, or urea, is deservedly one of the most popular and valuable fertilizers, due to the high content of easily assimilated forms of nitrogen. This type of fertilizer can be applied separately or combined with other nutritional compounds, used for root and foliar top dressing precisely in those periods when gardening crops are most in need of this event.
After determining the type of soil, you should pay attention to the botanical features and the stage of development of the culture.
Norms for root dressing
Cabbage, onions, beets, tomato, sweet peppers, potatoes
Approximately 20–22 g per square meter
Legumes and Cucumbers
5-7 g per square meter
Strawberries, blackberries, strawberries
25 g per 10 liters of water and not more than 1 liter under the plant
8-10 g per 10 l of water
18−20 g per 10 liters of water
Squash, eggplant and zucchini
10-12 g per square meter
Cherry and plum trees
120-150 g per 10 liters of water
230−250 g per 10 liters of water
Fertilizing at the sowing or planting stage is carried out directly in the furrows or planting holes. However, in that case, a prerequisite is the use of a soil layer, which will help to avoid lowering the indicators as a result of direct exposure to ammonia.
For foliar feeding of vegetable crops, a nutrient solution based on 9-15 g of granules diluted in 10 liters of water is used. As a rule, 55–60% of the urea volume necessary for plant nutrition is introduced in the autumn, and the remaining 40–45% should be paid in the spring.
Types of spring spraying
Urea is also very well established as a top dressing for seedlings of most garden crops. In this case, the standard solution is used approximately two weeks before planting young plants in a permanent place. Thus, urea is the most effective and affordable, in terms of cost and use, means.