Effect of reactive phosphate rock to corn on acid sulphate soil in South Kalimantan

Abstract

In South Kalimantan, acid sulphate soil rich in total phosphorus (P), but poor in available P, because of fixing. Most of the crops on the soil have a symptom of P deficiency. Reactive Phosphate Rock (phosphateR) was a slow-release P fertilizer and has a longer residual effect. This is to research on the effect of phosphateR to corn on acid sulphate soil in South Kalimantan. This research was carried out to determine the effects of reactive rock phosphate and planting method of corn on acid sulphate soil. This study used a factorial randomized block design with two factors. The first factor of P fertilizer, namely: P Fertilizer (SP 36), farmer practice, phosphate rock, phosphate rock + Manure, phosphate rock+ organic fertilizer+ phosphate rock+compost. The second factor is the planting method i.e: exsisting planting method (70x25 cm), Zig Zag Method (70x12,5 cm). The N and K doses are determined based on soil nutrient status. The results showed that phosphate treatment gave the weight of corncob where phosphate treatment with zig zag method reached 21% compared SP-36 with zig zag method treatment. And the lowest results are shown in the treatment of farmer practice with exsisting methods reached 10.07 t/ha corncob of weight.