The effect of N applied at different seasons and doses on seed yield and some yield components of smooth bromegrass (Bromus inermis Leyss.) and relationships among the characteristics

This study was conducter to determine the effects of time (autumn and spring) and dose (0, 4, 8 and 12 kg N/da) of nitrogen applications on seed yield and yield components of smooth bromegrass. The study was carried out under irrigated conditions in Erzurum, in crop seasons of 1986-1992. According to the mean of five years data nitrogen fertilization is recommended for high seed yield. Application of N as 4 kg/da in autumn+8 kg/da N in spring is effective for high seed yield (40.6 kg/da) and straw yield (959.8 kg/da) under irrigated conditions. The N application increased also generative shoots, seed weight and number per panicle and plant hight. Seed yield were positively correlated with number of generative shoots m2, straw yield, and plant hight.