Effects of fertilizers on yield and leaf nutrient concentrations in coconut
1986
Loganathan, P. | Atputharajah, P.P. (Coconut Research Institute of Sri Lanka, Lunuwila (Sri Lanka))
In experiments with coconut at three sites in Sri Lanka muriate of potash increased copra yield and leaf K and Cl but decreased leaf Ca and Mg; saphos phosphate increased yield only at two sites but generally increased leaf P, Ca and Mg and decreased leaf K and Cl; sulphate of ammonia had no effect on yield but generally increased leaf N and Ca and decreased leaf K and Cl. The sufficiency ranges of nutrient concentrations (% in 14th leaf) estimated from the yield/leaf nutrient concentration relationships were: N, 1.9-2.1; P, 0.11-0.13; K, 1.2-1.5; Mg, 0.25-0.30; and Cl, 0.30-0.40; that of Ca differed between the sites but was within 0.35-0.55 %
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