Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Alina FILIP (FEDOT), Doru Ioan MARIN
Understanding the relationship between yield and macronutrients fertilization is essential in maize cultivatio technology, especially in non-irrigated conditions that require the rational use of water and fertilizers to ensur efficient crops. From this point of view, the purpose of the research was to determine the influence of minera fertilization with nitrogen (N) and phosphorus (P) on the yield of different maturity groups maize hybrids and th identification of those hybrids with the best adaptation to the specific soil an climatic conditions of the area (Sarichioi Tulcea County, Dobrogea). The research involved sowing eight maize hybrids from different maturity groups: earl hybrids (DKC 3623 - FAO 260 and P8567 - FAO 275), mid-early hybrids (DKC 4590 - FAO 350 and P9903 - FA 360), mid-late hybrids (DKC 4717 - FAO 410, P0023 - FAO 400 and P0412 - FAO 480) and late hybrids (DKC 5632 FAO 510) under different mineral fertilization conditions with doses of nitrogen (N) and phosphorus (P) (N0P0; N60P0 N60P60; N120P60). Nitrogen fertilization led to a yield increase with values between 7.50 kg/kg N a.s. (for the hybri P99038) and 10.75 kg/kg N a.s. (at P99038 hybrid), and application of phosphorus resulted in yield increases fro 4.17 kg/kg P a.s. (P8567 and P0412) to 5.67 kg/kg P a.s. (DKC 4590). The eight hybrids responded to fertilization wit nitrogen and phosphorus, their yield ranging from 6.46 t/ha for the hybrid DKC 3623 hybrid unfertilized to 9.09 t/ha t for the hybrid P0412 fertilized N120P60. On average, mid-late hybrids (FAO 400-480) recorded the highest yields wit values between 7.35 t/ha and 8.77 t/ha
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