Productivity, economics and soil fertility under different maize (Zea mays) varieties as influenced by soil ameliorating practices in North Eastern hill region of India Tekijä RAMKRUSHNA G I, ANUP DAS, JAYANTA LAYEK, SUBHASH BABU, B C VERMA, D P PATEL, R KRISHNAPPA, SAVITA SAVITA, S V NGACHAN

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