Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 2
Written by Nikolay MINEV, Nedialka YORDANOVA, Maya DIMITROVA, Mladen ALMALIEV

Basic agrochemical characteristics were studied in maize grown under different variants of nitrogen fertilization. The maize hybrid P0216 of Pioneer Company was studied, grown under irrigation conditions, following the conventional adopted technology in our country. The hybrid is characterized by high productivity and drought resistance. The trial was set by the block-plot method with a plot size of 21 m². Nitrogen (2.4 kg N/ha) was applied in the following variants: 1. Untreated control; 2. NH₄NO₃ - pre-sowing application of the whole rate; 3. NH₄NO₃ - split application: ½ presowing and ½ at 5^th leaf; 4. NH₄NO₃ - 1/3 pre-sowing application, 1/3 - at 5^th leaf and 1/3 - at tasseling stage; 5. NH₄NO₃ - ¼ pre-sowing application, ¼ - at 5^th leaf, ¼ - at 12^thleaf and ¼ - at tasseling stage; 6. CO(NH₂)₂ - presowing application of the whole rate; 7. CO(NH₂)₂ - ½ pre-sowing and ½ at 10^th leaf; 8. CO(NH₂)₂ - ½ pre-sowing and NH₄NO₃ - ½ at 10^th leaf; 9. CO(NH₂)₂ - ½ pre-sowing and NH₄NO₃ - ½ at tasseling stage. Export of nutrients and their use efficiency per production unit are important agrochemical indicators for maize. Their values vary according to the genotype, soil and climatic conditions, the predecessor and fertilization. Nitrogen export varies greatly depending on the fertilization rate and phosphorus and potassium export - depending on the genotype and climatic conditions during the year.

[Read full article] [Citation]

SPUPOPUPNO1