Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 19 ISSUE 3
Written by Rodica CHETROIU

The weather conditions of the agricultural years 2015-2016 and 2016-2017 according to the rainwater regime were characterized as wet and very humid years. The administration of mineral fertilizers on the calcareous (carbonatic) chernozem showed the dependence of the dry substance accumulation on the winter wheat ontogenesis with the weather conditions. In the beginning of the straw stretch development phase of the winter wheat the most intense process of dry matter accumulation was determined. The dry matter accumulation was 3-4 times higher than in other plant development phases or 65% on average. The development phase of winter wheat with maximum organic mass accumulation was flowering, both for the control and fertilized variants. In the years with insufficient precipitation on the variant with dose rate N60-120P3.5K60 were occurred the delay of the maximum phase of organic substance synthesis until the milk-wax phase of wheat plants. The experimental data showed that the optimal variant with dry accumulation matter in the wheat plants was the dose N60P3.5K60. In the control variant, the dry matter content of the plant in the twinning phase consisted of 6.5 g on the 100 plants and increased by 73 times in the flowering phase with maximum nutrient consumption.

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