Temperature and Precipitation Effect on Barley Yields
N. PRZULJ, V. MOMCILOCIC and N. MLADENOV
Institute of Field and Vegetable Crops, Maksima Gorkog 30, 21000 Novi Sad, Yugoslavia
PRZULJ, N., V. MOMCHILOCIC and N. MLADENOV, 1999. Temperature and precipitation effect on barley yields. Bulg. J. Agric. Sci., 5:403-410
The object of this study was to determine the effect of temperature and precipitation on yield, 1000-kernel weight (TKW), and hectoliter mass (HM) of spring malting barley (SMB). For this purpopse, a serios of small-plot varietal trials involving five early, two-medium early, and two late SMB varieties was conducted between 1986 and 1995 at the Institute of Field and Vegetable Crops – Novi Sad. Correlation and regression coefficients for the traits in the question were determined relative to temperature and precipitation during certain stages of plant development. The contribution of particular components of phenotypic variability was determined using analisis of variance. Yields of the early varieties were positively correlated with the amount of precipitation at the stem elongation stage and negatively correlated with the amount of moisture at flowering and kernel fill. Kernel yields of the late varieties, on the other hand, were negatively correlated with total precipitation during the growing season, and especially high negative correlation was found with the amount of precipitation during the second half of the kernel fill stage. TKW and HM were both positively correlated with higher temperatures at heading, flowering, and kernel fill and negatively correlated with higher precipitation during stem elongation, flowering, and kernel fill. SMB yields depended most of all on the year of the study, followed by genotype x environment interactions. Values of the variance of genotype and year as well as genotype x year interactions were approximately the same for TKW and HM.
Key words: barley (Hordeum vulgare L.), temperature, precipitation, yield, kernel weight, hectoliter mass