S. KOSTADINOVA, T. TOMOV and I. MANOLOV
Agricultural University, BG-4000 Plovdiv, Bulgaria
S. KOSTADINOVA, T. TOMOV and I. MANOLOV, 2003. Productivity assessment of wheat genotypes in dependence of N fertilization. Bulg. J. Agric. Sci., 9: 469–473
Five perspective genotypes (Record, Perla, Fermer, Gracia and Shampion) of common winter wheat (Triticum aestivum, subsp. vulgare) and standard variety Sadovo 1 were studied under field experiment with three levels of nitrogen fertilization – 0, 12 and 24 kg N/dka. It was established that new genotypes were produced more wheat grain, in comparison with the standard variety Sadovo 1. Nitrogen fertilization was the main important factor affected grain yields (50.4 %), followed by year (33.3 %) and interaction of nitrogen ´ year (16.3 %). The high nitrogen rate 24 kg N/dka was slightly affected stress intensity at wheat under normal year conditions. Genotypes Record and Fermer were characterized with higher requirements to nitrogen levels and they increased their stress intensity along with nitrogen fertilizing. Under unfavorable hydrothermal conditions the average stress intensity for all studied genotypes was increased 4.5 times at applying N24 and new genotypes Record, Perla, Fermer, Gracia and Shampion were more responsive to increased nitrogen fertilization than variety Sadovo 1.