Pertumbuhan Dan Hasil Tanaman Padi Gogo (Oryza Sativa L.) Pada Tanah Ultisol …

ABSTRACT The low productivity of upland rice on Ultisol soil is caused by various constraints including low pH, had low content of macronutrient N, P, K, Ca and Mg, BS and CEC were low, solubility and high Al saturation, high P fixation, delicate to erosion and water availability were low. Applied of zeolite synthesized from coal fly ash with high CEC is expected to overcome these constraints.…