399. Following fertilizers are available for preparing a fertilizer mixture : 1. Ammonium sulphate 2. Urea 3. Single super phosphate 4. Basic slag 5. Muriate of potash A combination of the above-mentioned fertilizers which can be mixed & kept for three months or more is (a) 1, 4&5 (b) 2, 3 & 4 (c) 2, 4 & 5 (d) 1, 3&5
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a)
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