Population dynamics of cornborer in relation to chemical fertilizer combined with organic fertilizer in field corn (IPB-911)

Results showed considerable variability of the agronomic variables among treatments. The parameters included seedling vigor, days to silking and maturity, plant height at maturity, ear length, and weight per 100 seeds. The ear circumference of corn and insect population per plant were not significantly affected by the different treatments. However, insect population was found to be higher in plots fertilized with chemical fertilizer alone, compared with plots fertilized with a combination of organic and inorganic fertilizers. The results further disclosed that the different treatments, acting singly or in combination, proved to be effective in increasing grain yield. Grain yield from the treated plots was significantly higher compared to the control. Those treated with 4 bags/ha organic fertilizer + 3 bags/ha - 14-14-14 + 3 bags/ha - urea obtained the highest yield at 3.03 t/ha. The control or unfertilized plot gave the lowest grain yield of 1.64 t/ha. The results of the study showed that chemical fertilizer combined with organic fertilizer affected the growth and yield of corn. The plants fertilized at the rate of 4 bags/ha organic fertilizer + 3 bags/ha 14-14-14 + 3 bags/ha urea produced vigorous and small plants. The days to silking and maturity of IPB 911 corn variety was affected by the different treatments. However, the unfertilized plants were observed to be the earliest as to days to silking and maturity. The plants fertilized at the rate of 4 bags/ha organic fertilizer + 3 bags/ha 14-14-14 + 3 bags/ha urea gave the tallest plants. Results likewise revealed that ear length was longer from plots fertilized at the rate of 4 bags/ha urea. However, no significant differences were observed among treatments on the ear circumference. In terms of grain weight per 100 seeds, heavier seed weight was obtained in treatment E. Both chemical fertilizer and organic fertilizer gave remarkable effects on seed weight and development, indicating that the use of fertilizer is an important factor for increased percentage of seed weight of corn