The application of pure inorganic and the combination of both inorganic and organic fertilizer produced better root system development in terms of total root length, which in turn increased the water use of rice plants from the drying soil. Consequently, high water use contributed significantly to dry matter production and ultimately, grain yield through increased total number of filled grains per plant, panicle number per plant, tiller number per plant at vegetative growth stage, and number of productive tillers per plant at maturity. Depending on the inherent nutrient supply of the soil, combination of organic and inorganic sustains the optimum growth and yield performance of rice while keeping a healthy soil.
As the response of rice plant under IF and IF/OF were comparable, further study is needed with the
same set of treatments under field conditions. Along term experiment may be conducted to determine whether the continuous use of organic fertilizer in IF/
OF will have positive results on yield.
Acknowledgment
This research was funded by the Accelerated Science and Technology Human Resource Development Program (ASTHRDP) of the Department of Science and Technology (DOST) and Crop Biotechnology Center of the Philippine Rice Research Institute (PhilRice).
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