Document Type : Original Article
Authors
1
Department of Agronomy, Visayas State University, Visca, Baybay City, 6521 Leyte, Philippines.
2
Visca Laboratory High School, Visayas State University, Visca, Baybay City, 6521 Leyte, Philippines.
Abstract
An experiment on corn varieties to the combined application of organic and inorganic fertilizers was conducted. The study was laid out in a split plot arranged in RCBD with three corn varieties as the main plot while six fertilization strategies as subplot treatment such as follows; S1 - No fertilizer application; S2 - 90-60-60 kg ha-1 N, P2O5, K2O; S3 – 5 t ha-1 V4 Organic Fertilizer; S4 - 3.75 t ha-1 V4 Organic Fertilizer + 22.5-15-15 kg ha-1 N, P2O5, K2O; S5 - 2.50 t ha-1 V4 Organic Fertilizer + 45-30-30 kg ha-1 N, P2O5, K2O and S6 - 1.25 t ha-1 V4 Organic Fertilizer + 67.5-45-45 kg ha-1 N, P2O5, K2O. The hybrid corn variety “Macho F1” developed longer, bigger, and heavier ear weights; produced the highest marketable ear and total ear yield (t ha-1), and achieve a higher gross margin of USD 2,782.15. The application of 1.25 t ha-1 V4 organic fertilizer + 67.5-45-45 kg ha-1 N, P2O5, K2O (S6) and 2.50 t ha-1 V4 organic fertilizer + 45-30-30 kg ha-1 N, P2O5, K2O (S5) enhanced remarkably the agronomic characteristics, and the yield and yield component parameters especially the weight of marketable ears (t ha-1) that result to achieve higher gross margins. The combined application of fertilizers is recommended to corn growers not only in helping their financial production constraints but this will support an adaptation strategy in reducing the ill effect of climate change in their corn production undertaking in the tropics
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