Grain weight is a genotypic characteristic that is directly related to the realization of yield. Analysis of average grain weight was performed in ten genotypes of winter hexaploid triticale (Trimaran, Ticino, Odisej, Agrano, BLT21, BLT17, BLT10, Max 1793, Bogo and Tornado). Experiment was conducted during 2005/06, 2006/07, 2007/08. in Trapisti, region Banja Luka. During the experiment of winter triticale standard agricultural practice was applied. Microclimatic conditions during triticale cultivation in 2006 and 2008. were relatively similar, while in 2007. there was drought period occurrence. Statistical analysis of observed genotypes for the specified parameter was performed with method analysis of variance 10x3. Analyses of significant differences were done by using LSD test, while interactive effect was analyzed by graphical method. The average weight of triticale genotypes grain regardless of the year showed highly statistically significant differences, while in observation of years regardless of the genotype showed mutually statistically significant differences. Analysis of these relationships was observed through the interaction effects as a final evaluation of the observed genotypes. Based on the average values of the grain weight, winter triticale genotypes were evaluated. The average grain weight of triticale genotypes in the observed years showed the lowest average weight in 2007 (0.0369 g), while the highest grain weight was obtained in 2006 (0.0406 g). Statistically significant difference of the average grain weight of the observed genotypes of triticale regardless of the year showed that genotypes Bogo (0.0465 g), Odisej (0.0453 g) and BLT10 (0.0424 g) were those of the highest average grain weight without significant differences between them. These genotypes were evaluated as potentially productive genotypes under the agroecological conditions of Banja Luka. [Projekat Ministarstva nauke Republike Srbije, br. TR-31092

Advantages or disadvantages of intercropping system can estimate through expression of components of yield on the base of values of productive organs (spike, pod). The aim of this work was study of variation of spike index in cereals species and pods index in pea of spring intercropping. For investigation included spring species of small grains: wheat, triticale, oat and spring legume pea. The investigation was carried out in field condition in experiment with randomised block design of 5m 2 plots, with 4 replications. Each species (cereals and pea) were sown sole and in intercrops wheat+pea, triticale+pea and oat+pea. At the maturity stage used 40

This paper analyzes 10 different genotypes of the bread wheat by method of chromatography to identify the presence of free amino acids. The contents of the identified amino acids have been determined by spectrophotometric method. The results of the qualitative analysis showed the great deal of variability in the amino acid composition for each of the examined genotypes. Quantitative analysis of the free amino acids in the grains indicated their high content (over the 100 mg ml -1 ) in wheat genotypes San Pastore, Becker, Lihnida and Ana Morava, while their lowermost content was in the genotypes Uras (73 mg ml -1 ) and Jawa (75 mg ml -1 ). By using chromatography in the examined wheat grains have been determined that the most present amino acids were glutamic acid, glycine, sarcosine, valine, norvaline and tryptophan. The most present of all examined amino acids was glutamic acid, which was identified in nine examined wheat genotypes. The highest content of glumatic acid was found in wheat genotype Uras (6,52 mg ml -1 ). Among the essential amino acids has been found the highest content of norvalin (2,56 mg ml -1 ) and valin (2,32 mg ml -1 ). The wheat grains of the genotypes Becker, San Pastore and Ana Morava had the largest number of the determined essential amino acids (five), indicating their high nutritional value.

The sowing density of wheat is important for expression of number of spikes per unit area, grain yield as well as other yield components. The aim of this work is investigation of variability of grain yield and number of spikes per unit area influenced by different sowing densities under different environmental conditions. Three wheat genotypes NS 40, Prima and Nova Bosanka were studied at seven different sowing densities (384, 424, 451, 504, 544, 588 and 604 seeds m-2) with four replications on experimental plot of one m2 on field experiment in agro‒ecological conditions of Banja Luka during two successive growing seasons. In all studied wheat cultivars, the lowest number of spikes m-2 and the lowest grain yield were found on variant of lowest sowing density (384 seeds m-2), while the highest number of spikes m-2 and the highest grain yield were found on variant of 588 seeds m-2 in both years. The wheat genotype NS 40S had the highest number of spikes m-2, while Nova Bosanka had the lowest at all variants of sowing densities in both years. Mainly, at all variants of sowing densities, the highest values of analyzed traits were expressed in first year of experimental investigation. Depending of year and variant of sowing density the highest grain yield were found in NS 40 and Prima, while the lowest grain yield had Nova Bosanka in both years of experiment. In general, the recommended wheat sowing rates should be confirmed in the specific area of production and for the specific genotype.

Variability in the percentage of seed germination was studied in four winter barley cultivars ('Jagodinac', 'Premium', 'NS 489' and 'NS 495'), grown under four nitrogen application rates (control N 0 =0, N 1 =20, N 2 =40 and N 3 =60 kg ha -1 ) during two years of the experiment. The experiment was carried out as a randomised block design in 5m 2 plots and with four replications. In both experimental years, the average seed germination was over 90.0% for all barley cultivars and in each nitrogen fertilisation treatment. The maximum seed germination percentage was 98.0% in 'Premium' in the second year in the treatment N 3 =60 kg ha -1 , and minimum germination percentage (90.1%) was also recorded in 'Premium' 'in the first year of the experiment in the unfertilised control (N 0 =0 kg ha -1 ). The obtained values of seed germination significantly differed among cultivars in the first and second year. Also, the average values of seed germination under four N fertilisation treatments were significantly different in both years. The average values for both years of the experiment were significantly different among cultivars and treatments. The values of seed germination for all cultivars increased with increasing nitrogen rates, suggesting that phenotypic variability in seed germination was affected by nitrogen fertilisation, which indicated a high value (81.87%) of the component of phenotypic variance for seed germination.