Severe nitrogen‑deficiency in unfertilized plots resulted in low bearing percentage (19.62%) of the palms. Highest bearing percentage of 68.82% was observed on palms applied with 1.5 kg ammonium sulfate per palm per year.

                Application of 2 kg ammonium sulfate/palm/year resulted in most number of harvested nuts. The yields of palms applied with 1.5 kg ammonium sulfate or 0.66 kg/urea/palm/year were, however, not statistically different from the former. Similar trends in fresh meat and copra yields were observed. Copra yields were significantly higher in plots applied with inorganic N fertilizers.

                Palms growing on Maasin clay had higher nut, tresh meat, and copra yields than those planted on Mandaue clay and Palo clay loam.

Leaf nitrogen significantly increased in palms applied with 2 kg KCL plus kudzu mixed with calopogonium or 2 kg KCL plus inorganic N fertilizer. Phosphorus slightly decreased with increasing level of inorganic nitrogen fertilizer. Unfertilized palms and those applied with 2 kg KCL obtained the highest K values. Calcium and magnesium were not influenced by the different sources of nitrogen fertilizer. Palms growing on Maasin clay had higher leaf nitrogen content than those planted on Mandaue clay Palo clay loam. No trend between years of study was distinguishable from the observed values of the leaf elements.

Application of inorganic fertilizers could give better income to coconut farmers especially in N‑deficient areas. Highest net profits were obtained from palms growing on Maasin and Mandaue clays and fertilized with 2.0 kg ammonium sulfate plus 2 kg KCL per palm per year applied twice in equal splits. On the other hand, the application of 1.5 kg ammonium sulfate plus 2 kg KCL per year was enough to obtain highest net profit from palms grown on Palo clay loam.