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- [1] RESPONSES 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 [J]. NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH, 1985, 28 (04) : 487 - 495