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Effects of drain depth of vertisols, nitrogen source and time of application on nutrient uptake by maize (Zea mays L.) in Western Ethiopia. Int. J. Agril. Res. Innov. Tech. [Internet]. 2017 Jul. 25 [cited 2026 Jun. 27];7(1):1-7. Available from: https://www.banglajol.info/index.php/IJARIT/article/view/33314