Determination of suitable nitrogen doses for growing second product maize (zea mays l.) varieties in chickpea planting fields and its economic analysis
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This research was carried out in an experiment field belonging to Kiziltepe Vocational Higher School, Mardin Artuklu University in the 2013-14 planting seasons. The experiment was executed in three repetitions according to “the Split Plots in Coincidence Blocks Design”. As material; commercial maize varieties of Dekalb 5401, Dekalb 5783, Pioneer PR32T83, and Syncero were selected. Three nitrogen doses [0, 150, and 300 kg ha-1 (ammonium nitrate)] and 80 kg ha-1 phopshorus (P2O5: TSP: triple super phosphate) were used. According to the two year results, while the highest unit field grain productivity was obtained with Syncero (9,527.2 kg ha-1) and Dekalb 5401 (9,491.5 kg ha-1), the lowest was provided with Dekalb 5783 (823.1 kg ha-1). In terms of the effect of nitrogen doses on unit field grain productivity, while the highest value was obtained from D3 application (300 kg ha-1) at 10,212.2 kg ha-1, the lowest value was obtained through the D1 control plot (0 kg ha-1) at 7,844.5 kg ha-1. The economic analysis, showed that productivity level increased as the dose rose. The highest revenue-generating dose was 300 kg ha-1 among the nitrogenous fertiliser applications. In this context, a profit of USD 2.87 was made in return for a cost of USD 1.00. As further doses should be applied for a net determination, it is difficult to estimate if this is the most profitable dose. Under the circumstances, however, it can be stated that the highest profitability is possible through this application (the 3rd).