Now in the hot and rainy season, the climate is good for all kinds of crops. For rice crops with long growing period such as rice, corn and cotton, it is a vigorous growth stage of vegetative growth and reproductive growth. The demand for nutrients in crops is very large, and it is generally necessary to apply quick-acting fertilizers. The top dressing of various crops is first supplemented with nitrogen fertilizer. Then, what is the effect of ammonium bicarbonate and urea as top dressing?
Relevant agricultural experts believe that the two kinds of nitrogen fertilizers, such as ammonium bicarbonate and urea, all have the same water-soluble and quick-acting nitrogen fertilizer, which are suitable for topdressing, and the fertilizer efficiency is relatively fast. However, the fertilizer efficiency of a fertilizer depends on whether it can be directly absorbed by the roots of the crop. At this point, urea is different from ammonium bicarbonate. The ammonium ions released by the ammonium bicarbonate can be directly absorbed and utilized by the crop.
After urea is introduced into the soil, most of it needs to be decomposed into ammonium carbonate by the action of soil urease, and the ammonium ions can be absorbed by the roots of the crop. It can be seen that urea can be absorbed and utilized after being transformed, and the length of time required for this transformation process is mainly affected by soil temperature, and secondly by soil water and fertilizer. When the temperature is 10 °C, the conversion is slow, and it takes 7 to 10 days to complete; when the soil temperature is 20 °C, it takes only 5 to 6 days to complete the conversion;
When the soil temperature in summer reaches 25-30 °C, urea conversion takes only 3 to 4 days. Therefore, the fertilizer efficiency of urea is slower than that of ammonium bicarbonate. Urea and ammonium bicarbonate have different speeds, so urea should be properly advanced in the fertilization period. They are all active fertilizers, which determine that in the fertilization method, both need to be ditched or burrowed, applied below 5-8 cm, and covered with soil to prevent the loss of ammonia in the ammonia nitrogen fertilizer.
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