ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


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 5th leaf; 4. NH4NO3 - 1/3 pre-sowing application, 1/3 - at 5th leaf and 1/3 - at tasseling stage; 5. NH4NO3 - ¼ pre-sowing application, ¼ - at 5th leaf, ¼ - at 12thleaf 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 10th leaf; 8. CO(NH2)2 - ½ pre-sowing and NH4NO3 - ½ at 10th 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.

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