Carbamide (urea) - chemical formula H2N-CO-NH2, excellently soluble
in water, alcohol, liquid ammonia and sulfur dioxide. In industry,
urea is synthesized from ammonia and carbon dioxide via reaction
Bazaroff. That is why the urea production often combined with
production of ammonia.
Urea contains about 46% nitrogen, thus being the most concentrated
nitrogenous fertilizers. The fertilizer is available in two grades
A and B. Grade A is designed for industrial use, grade B - for
agriculture. The substance is soluble in water and is excellent in
storage does not cake. Suitable for all soil types as the basic and
presowing fertilizer and also as a dressing.
Efficiency of urea used as a basic fertilizer, is not inferior to
the well-known all ammonium nitrate. At the same time, it contains
the highest amount of urea nitrogen, which ensures a high
feasibility of its use.
Urea is also used as a foliar application of vegetable, fruit and
late fertilizing wheat, aimed at increasing the protein content in
the finished grain. Urea is valuable because in contact with the
plant is no burn, and therefore does not harm the leaves. This
quality provides excellent digestibility fertilizer. At the same
time, when applied to the soil surface, urea should immediately be
stopped, in order to prevent the loss of nitrogen due to
volatilization of ammonia.
When using urea in acidic soils is recommended for each quintal of
fertilizer use as an additive 0,8ts calcium carbonate. Just urea
phosphate can be mixed with flour or superphosphate. It is worth
noting that the urea is extremely resistant to leaching, which is
especially important for irrigated agriculture. The fertilizer can
be introduced into the soil in solid form or in the form of liquid
solutions with other nitrogen fertilizer.
The most commonly used urea as a fertilizer for potatoes, sugar
beet and vegetable crops.
Wheat, rye, oats: basic introduction rate of 100-150 kg per 1
Sunflower: about 80-120 kg per 1 hectare.
Corn grain: presowing a basic introduction - 110-160 kg per 1
Vegetable crops: 5-12 grams paid before boarding the 1st quarter.
meter; during the growing season - feeding rate of 5-10 grams per 1
sq. meter; top-dressing before flowering - 3 liters of working
solution (50-60 g of urea per 10 liters of water) to 100 square
meters. meters of treated culture.
Trees and shrubs, ornamental and fruit: Fertilizing is done in 5-7
days after the end of flowering and reprocessing through 21-28 days
- making 20-30gramm urea dissolved in 10 liters of water or 1 sq.
meter of 15-20 grams of dry urea.