A study was conducted to evaluate the influence of different nitrogen (N) and potassium (K) fertilization levels on the growth and yield of maize. Results demonstrated a highly significant positive effect of combined N and K application on all measured parameters. The highest application rate of 170 kg/ha N + 40 kg/ha K (T6) consistently produced the maximum values for plant height (207.2 cm), leaf area (204.1 cm²), stem diameter (3.63 cm), number of cobs per plant (1.24), number of grains per plant (510.5), 100-grain weight (325.0 g), chlorophyll content (38.15), green fodder yield (6.08 t/ha), dry matter yield (9.95 t/ha), and harvest index (37.40%). In contrast, the control treatment (T1), which received no fertilizer, resulted in the minimum values for all parameters. Statistical analysis confirmed that the differences between the treatment means for all growth and yield attributes were significant at the 5% probability level, as all values exceeded the respective Least Significant Difference (LSD). The results establish a clear dose-dependent relationship, concluding that the integrated application of nitrogen and potassium is crucial for optimizing vegetative growth, enhancing photosynthetic capacity, and significantly improving both grain and biomass yield in maize.
Kaleri et al. (Thu,) studied this question.
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