Productivity of high-yielding crops

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Abstract
By using good varieties (lines) and by applying coating urea which releases nitrogen slowly, extremely high yields were obtained in several crops. Based on the high yields and appropriate fertilizer application, it was difficult to consider in this experiment that deficiency or excess of nutrient elements (minerals) occurred in plant, so that the mineral status of crops could be adopted as criterion for high yield. The results obtained were as follows.

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