Effect of long-term tillage and diversified crop rotations on nutrient uptake, profitability and energetics of maize (Zea mays) in north-western India af M R YADAV, C M PARIHAR, S L JAT, A K SINGH, D KUMAR, V POONIYA, M D PARIHAR, D SAVEIPUNE, H PARMAR, M L JAT

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