Peat soils contain high concentrations of organic nitrogen, but in a form that is not available to plants. South Kalimantan has NH4+ in the range 4.51-736.86 mg.kg -1and NO3- content is in the range of 0.37-54.69 mg.kg-1. ...

The productivity of palm oil plantations are generally still low compared to the potential productivity of the land. Fertilization is an important factor in acheving high productivity, mainly to meet the requirement of ...