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Responses of citrus citrus sinensis to nitrogen phosphorus potassium fertilizer on 2 soils of rarotonga cook islands 2. effects of nitrogen phosphorus potassium fertilizer rate soil properties and leaf nutrient levels on yield and tree size



Responses of citrus citrus sinensis to nitrogen phosphorus potassium fertilizer on 2 soils of rarotonga cook islands 2. effects of nitrogen phosphorus potassium fertilizer rate soil properties and leaf nutrient levels on yield and tree size



New Zealand Journal of Agricultural Research 28(4): 487-496



The application of increasing rates of nitrogen-phosphorus-potassium (NPK) fertiliser to citrus (Citrus sinensis (L.) Osbeck) resulted in significantly increased overall fruit yields from 4 trial orchards on 2 soil types of Rarotonga, Cook Islands [New Zealand]. In 2 of the trial orchards, higher fertilizer rates consistently resulted in significant increases in fruits yields. For these 2 orchards, yields were positively correlated with leaf N levels, negatively correlated with leaf P and K levels, and uncorrelated with leaf sulfur (s) levels. These correlations, which occurred even though higher fertilizer rates resulted in comparatively higher soil levels of P, K, and S, suggest that the increased yields resulted from the increased fertilizer N input. Decreased leaf P and K levels at higher fertilizer rates appeared to be caused by increased translocation of these nutrients from the leaves to the fruit, because of higher fruit yields. On one of the 2 soil types, fruit yields were also positively correlated with leaf magnesium (Mg) levels, which were closely related to soil Mg levels. There was no significant effect of fertilizer rate on tree size during the experiment.

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Response of citrus (Citrus sinensis) to nitrogen-phosphorus-potassium (NPK) fertilizer on 2 soils of Rarotonga, Cook Islands. 2. Effects of NPK fertilizer rate, soil properties and leaf nutrient levels on yield and tree size. New Zealand Journal of Agricultural Research 28(4): 487-495, 1985

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