The aim is to determine the optimum combination of inorganic fertilizer and organic materials for increasing the productivity of rice crop (
Oryza sativa L.). The experiment was conducted in February–June 2015 in Kebadu, Sanggau, West Kalimantan, Indonesia. The study area was located
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The aim is to determine the optimum combination of inorganic fertilizer and organic materials for increasing the productivity of rice crop (
Oryza sativa L.). The experiment was conducted in February–June 2015 in Kebadu, Sanggau, West Kalimantan, Indonesia. The study area was located at 00°0.08,785′ N north latitude and 110°0.07,175′ E east longitude with ultisol soil; the altitude is 32 m above sea level, rainfall level ranges between 185–267 mm month
−1, and the solar radiation is 375.49–452.58 cal cm
−2 day
−1. This study used a factorial randomized block design. The first factor was the inorganic fertilization (without fertilizer, inorganic fertilizer 50%, 100%, and 150%) and the second factor was the addition of organic materials (EM
4 2 l ha
−1, chicken manure 2 t ha
−1, and manure 2 t ha
−1 + EM
4 2 l ha
−1). Results showed that the application of chicken manure and a combination of chicken manure + EM
4 could reduce the need for inorganic fertilizer NPK by up to 50% with productivity that ranged from 4.18–4.20 t ha
−1; this is relatively similar to 100% and 150% inorganic fertilizer NPK, and can increase the harvest by up to 68% compared to the no-NPK inorganic fertilizer.
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