Nitrogen and potassium fertilizer requirement of oil palm grown on Ao Luk soil series
2000
Sunee Nithesphattarapong(Department of Agriculture, Bangkok (Thailand). Horticulture Research Inst. Surat Thani Horticulture Research Center) | Surakitti Srikul(Department of Agriculture, Bangkok (Thailand). Horticulture Research Inst. Surat Thani Horticulture Research Center) | Pinyo Medet(Department of Agriculture, Bangkok (Thailand). Horticulture Research Inst. Surat Thani Horticulture Research Center) | Chai Korawis(Department of Agriculture, Bangkok (Thailand). Horticulture Research Inst. Surat Thani Horticulture Research Center)
Studies on nitrogen (N) and potassium (K) requirement of mature oil palm grown on Ao Luk soil series have been conducted in Krabi province, Southern Thailand from 1995 through 1999. The experiment was designed as 4*4 factorial in RCB consisted of 4 levels of N (0.0, 0.263, 0.525 and 1.050 kg N/palm/yr) and 4 levels of potassium (0.0, 0.9, 1.8 and 3.6 kg K2O/palm/yr.) N and K applications significantly increased fresh fruit bunch yield and bunch number. In addition, the investigation found a significant relationship between N and K applications and fresh fruit bunch yield. The relationships were N application : Y = 107.92 + 57.646 N apply - 28.414 N (sup)2 apply r (sup)2 = 0.985 K application : Y = 118.7 + 6.542 K apply - 1.149 K (sup)2 apply r (sup)2 = 0.864 From the calculation the optimum amount of N and K application were 0.81 kg N/palm/yr (calcium nitrate 5.4 kg/palm/yr) and 2.31 kg K2O/palm/yr (potassium chloride 3.85 kg/palm/yr), respectively, which gave 135.2 kg/palm/yr of fresh fruit bunch. The results also showed that nitrogen application gave significant increase in leaf phosphorus concentration and decrease in leaf magnesium concentration. Potassium application significantly increased leaf calcium concentration.
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