Abstract
Ammonium Exchange Behavior and Sugarcane (Saccharum officinarum L.) Yield Affected by Inorganic NPK and Organik Fertilizer Planting in an Ultisol soil of Gedung Meneng – Nitrogen plant availability in the form of ammonium (NH4+) can be influenced by the availability of other cations such as availability of K, Ca, Mg in soil solutions. Increasing crop production by no excepetion of sugarcane requires both organic and inorganic fertilizers. The objectives of this research are to study: (1) the effect of inorganic and organic fertilizers on sugarcane production, (2) behavior of NH4+ exchange in soil given NPK inorganic and organic fertilizers in sugarcane planting plots and (3) correlation of NH4+ Q/I parameters with harvested N and sugarcane biomass. The results of this study indicate that: (1) Giving a combination of inorganic and organic fertilizers(treatment C = 100% NPK + 50% organic) has a significant effect on biomass, harvested N and C by sugarcane but not significantly different from the treatment of only inorganic fertilizers ( treatment A = 100% NPK). (2) Giving inorganic and its combination with organic fertilizers (A, C, and D) affect the parameters of the (Q/I) NH4+ which is increasing the easily released adsorption of ammonium(∆NH40) and the ammonium activity ratio in balance (ARNH40) but decreases ammonium buffer capacity (PBCNH4) and the selectivity coefficient of ammonium (Kv) compared to the treatment of only organic fertilizer (B = 100% organic) and without fertilization (E). (3) Harvested N and sugarcane biomass are positively correlated with the easily release of ammonium (∆NH40-non-specific adsorbed), ammonia activity ratio in equilibrium with other cations in soil solution (AR NH40) and cation exchange capacity (CEC), but not significantly negative correlated with ammonium potential buffer capacity (PBC NH4).
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