Keywords:  smaize, plant height, nitrogen fertilizers, weather conditions, preceding crop.

Мелиорация.– 2025. – №1 (111). – P 35–44

In 2022–2024, the effect of carbamide-ammonia mixture (CAS), carbamide and farmyard manure on the growth dynamics of corn plants grown in crop rotation and repeatedly, depending on the prevailing weather condi-tions of the year, was studied on cultivated cohesive sandy soil. It was found that under arid conditions in May – June, plant height  decreases by 1,4–1,5 times, and high doses of nitrogen (more than 90 kg/ha) do not affect their growth. With heavy rainfall in June, an increase in nitrogen application rates and  nitrogen top-dressing have a positive effect on maize growth. The use of organic fertilizers contributes to a better growth of plants, especially with sufficient availability dur-ing their  intensive growth. Spraying of CAS plants in the 7–8 phase of maize leaves, even when diluted to 8 % nitrogen concentration, causes severe burns of the leaves, which leads to a  decrease in their height, and carbamide, when broadcast application of fertilizer, on the contrary, contributes to its increase.