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- [3] NITROGEN, PHOSPHORUS AND POTASSIUM REQUIREMENTS FOR TARGETING YIELD OF HYBRID MAIZE INDIAN JOURNAL OF AGRICULTURAL SCIENCES, 1978, 48 (08): : 480 - 482
- [4] Phosphorus and potassium soil test and nitrogen leaf analysis as a base for citrus fertilization Nutrient Cycling in Agroecosystems, 1998, 52 : 67 - 74
- [8] Nitrogen, phosphorus, and potassium requirements for Eucalyptus urograndis plantations in southern Brazil New Forests, 2018, 49 : 681 - 697
- [9] NITROGEN, PHOSPHORUS, POTASSIUM, MAGNESIUM, AND SULFUR REQUIREMENTS FOR MAIZE GRAIN PRODUCTION NEW ZEALAND JOURNAL OF EXPERIMENTAL AGRICULTURE, 1981, 9 (3-4): : 243 - 249