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Nitrogen is an essential plant nutrient and a major yield-determining factor, required for normal vegetative growth and grain development of maize. Applying nitrogen requires appropriate fertilization management to achieve efficient nutrient utilization. A field experiment was carried out on Fluvisol to evaluate the yield and growth parameters response of maize (Zea mays var. saccharate) to incremental rates of N fertilizer (100, 150, 200 kg N/ha) from two different fertilization sources – ammonium nitrate (NH4NO3) and urea (CH4N2O). Highest yield was measured in plants subjected to N200 (9.76 t/ha) fertilization rate with NH4NO3. A high linear correlation was observed between yield and nitrogen fertilization rate regardless of the nitrogen source. The effect of different nitrogen rates was significant on leaf number and mass, ears mass, internodes number and mass per plant. The results revealed that the nitrogen source significantly affected the number of leaves per plant and the leaves mass. The individual effects of fertilization rate and source on yield were not statistically significant in isolation. However, when considered together, they exhibited a significant effect at the 95% confidence level.

The tomato (Solanum lycopersicum) is a crop that is characterized by considerable nutrient export because of its intensive growth, development, fruiting, and high biomass production. The purpose of this study is to determine how single-dose and split potassium fertilization impact the overall amount of nitrogen, potassium, and phosphorus exported from soils during crop harvest. A field experiment was carried out on Fluvosol (FAO, ISRIC World Soils) with K2O content of 20.3 mg/100g, P2O5 content of 5.8 mg/100g, and mineral N of 19.6 mg/kg. It was found that the biological yield and N, P2О5 and K2O nutrient export are significantly influenced by planting time and potassium fertilization treatments. Higher tomato fruit and biomass yields (61878.9 and 27184.9 kg/ha), along with higher nutrient export rates were observed in mid-early tomato plants. The highest yield and total N, K2O and P2O5 export from the soil was measured at split potassium (К80+80+80) fertilization treatment. A positive linear correlation between yield quantity and nutrient export was observed. The biological yield and nutrient export were shown to be significantly impacted by potassium fertilization (P