Rock phosphate fertilization and amelioration in peat soil and P, K, Ca and Mg uptake by corn
1997
Nelvia (Universitas Riau, Pekanbaru (Indonesia). Fakultas Pertanian)
The low productivity of peat soil is highly correlated with high acidity and cation exchange capacity but low in base saturation, and low in nutrients contents. Those conditions do not contribute the growth environment, rate and availability of plant requirement. In the soil acidity, the P element has a great role in the increasing of plant growth and yield. The growth of plant is suffer, stunt, chlorotic and fail in forming grain. Based on these explanations, this research was done to increase the productivity of peat soil by increasing the available P, K, C and Mg with addition of phosphate rock and amelioration for maize. This research was done in the green-house and the laboratorium of Soil Science Department of Agricultural Faculty of UGM, Yogyakarta. This experiment used peat soil of Rengat of Riau province from 0 to 30 cm. It was used split plot design and three replications, without ameliorant, lime, oil palm bunch ash and volcanic ash as main plot. Ameliorant were added at the rate of 10 and 20 ton/ha. The rock phosphate consisted of 0, 100, 200 and 300 kg P2O5/ha as the sub plot. The Urea and KCl were given as a basic fertilizer and the dosage of each were 300 kg/ha and 175 kg/ha. The result of this research showed that the oil palm bunch ash could increase P and K uptake by shoot and P, K and Mg by root, and growth of plant. Volcanic ash increased Ca uptake by shoot and root, Mg by shoot and growth of plant. The highest growth (dry weight of shoots and roots) was found on 10 ton/ha oil palm bunch ash without phosphate rock. The addition of 20 ton/ha of oil palm bunch ash and volcanic ash of 10 and 20 ton/ha must be followed with the addition of 200 to 300 kg P2O5/ha of rock phosphate in order to find the best growth of plant and the highest nutrient uptake
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