Influence of long-term mineral fertilization on the content of main macronutrients in the aboveground biomass of maize hybrid Kneja-435
Margarita Nankova
, Trayan Sartmachev, Miroslav Slavov, Nikolay Tsenov
Резюме: The research was conducted in a long-term fertilizer experiment, initiated in 1967 on Haplic Chernozems in the Experimental Field of DAI General Toshevo. It covers 49 fertilizer combinations with different norms and ratios between NPK. The changes in the concentration of the main macroelements in the vegetative biomass (VBM), the corn cob and the grain of hybrid Kneja-435 for the period 2020-2023 were investigated. The tested fertilizer norms of nitrogen and phosphorus are 0, 60, 120 and 180 kg/ha, and 0, 60 and 120 K2 O kg/ ha for potassium. It was established that the nitrogen content in the corn grain increases with the growing norm of nitrogen fertilization in all PK combinations (from 1.26% to 1.77%). A similar trend was also found for the concentration of nitrogen in VBM (leaves + stems) - from 0.65% to 1.07%. The concentration of phosphorus in the grain also grows with increasing nitrogen fertilization norm, but the trend is less pronounced. The highest concentration of potassium was foundеd in VB, followed by that of the corn cob and the grain. Compared to the dynamics in the concentration of nitrogen and phosphorus depending on the increasing nitrogen fertilizer and its combinations with PK, that of potassium is the weakest. In the chemical composition of the corn cob, the influence of the nitrogen norms and its combination with PK is the least pronounced. Results show that the content of macronutrients in the grain were distinguished by lower values of the coefficient of variation at all levels of nutritional regime compared to those of the non-economic part of the production. Nitrogen in the grain with increasing nitrogen fertilization has a strong correlative relationship with its concentration in the VB.
Ключови думи: long-term mineral fertilization; maize; NPK concentration by organs
Цитиране: Nankova, M., Sartmachev, T., Slavov, M., & Tsenov. N. (2025). Influence of long-term mineral fertilization on the content of main macronutrients in the aboveground biomass of maize hybrid Kneja-435. Bulgarian Journal of Crop Science, 62(3) 11-29
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| Дата на публикуване: 2025-06-27
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