Effect of sulphate fertilizer applications on leaf sulphur status of oil palm
Mature oil palms growing on a Lancang series soil were supplied with ammonium sulphate, urea or urea plus K (4.8 kg potassium sulphate). Application rates were 0.4 or 0.8 kg N per palm per year. The fertilizers were applied broadcast over a weeded circle around the palm, twice or 4 times each year, or broadcast […]