The influence of seed inoculation with a bio-preparation of nodule bacteria Rhizobium leguminosarum, fertilization of 0, 40, 80, 120 kg N/ha and molybdenum topdressing on the yield of green mass, dry ma�er, seed, average number of pods per plant, average number of seeds per pod, average nodule number per plant, nodule dry weight as well as plant and seed protein concentration were studied during the two years of investigations on two soils -Mollic Gleysols and Eutric Cambisols. The highest values of all investigated parameters were obtained in the inoculated seed variants with molybdenum application, except the average nodule number per plant where the highest values were achieved in variants without molybdenum. The effect of nitrogen fertilization depended on the soil type, i.e. its chemical properties. The largest number of the investigated parameters obtained the highest values as a result of fertilization with 40 kg N/ha on Mollic Gleysols (3.96% humus). Thus, seed yield was 4.02 t/ha, nodule dry ma�er 0.482 g per plant whereas seed protein concentration was 26.91%. The largest number of the investigated parameters on Eutric Cambisols (1.07% humus) obtained the highest values with fertilization of 80 kg N/ha where seed yield amounted to 3.65 t/ha, nodule dry ma�er 0.456 g per plant while seed protein concentration was 26.48%.

In an 18‐week treatment, the effect of linolenic acid on European catfish (Silurus glanis L.) growth indicators was investigated as to weight gain, feeding coefficient (FCR value), specific growth rate (SGR value), protein efficiency ratio (PER value), productive protein value (PPV) and survival rate. Concurrently, the fishmeat chemical composition was also investigated. The experiment was organized into four groups, each divided into three subgroups. Stocked in each of 12 cages were 30 × 1‐year‐old catfish, with individual weights ranging from 148.5 to 151.5 g/ind. All fish were given standard feed for European catfish which contained 45% protein. The first batch, control group (C), received no additional linolenic acid. Linolenic acid was added to the feed of the second (E1), third (E2) and fourth group (E3), at 0.5, 1.0 and 1.5%, respectively. Growth indicator improvement was best in the E2 group fed the 1% linolenic acid, whereby the fish weight gain was 12.6% higher and the feeding coefficient 12.9% lower, while SGR, PER and PPV values were 6.1, 12.0 and 15.8% better than the control group. Growth indicators were also significantly (P < 0.01) improved in the three groups receiving additional linolenic acid in comparison to the control group. Moreover, this addition positively affected fishmeat quality by increasing meat protein content from 18.04% (C) to 18.79% (E3). The total unsaturated fatty acid content also increased from 65.07% (C) to 69.82% (E3), and the total saturated fatty acid content decreased from 31.36% (C) to 26.50% (E3); consequently, the ratio of unsaturated to saturated fatty acids increased from 2.07% (C) to 2.63% (E3). It can be concluded that the addition of 1% linolenic acid to standard catfish feed has beneficial effects on fish growth indicators and meat quality.

This study investigated infection levels with Fusarium graminearum and Fusarium culmorum in malt barley and wheat in eastern Croatia. The contamination was surveyed over three consecutive crop years (2001-2003) on five locations for barley and three wheat cultivating locations. F. graminearum loads reached levels of potentially serious threat for the commercial production of malting raw materials in both cereals (up to 29.1%). On the other hand, the mean percentage of kernels infected with F. culmorum was low to medium (up to 6.1%). The fungal invasions for years and locations were affected by meteorologic and other environmental factors and the pattern seemed to be consistent with species-specific optimal conditions reported by other authors.

No abstract

Biological nitrogen fixation represents the subject of numerous investigations of the scientific community. The advantages of this process, as already well known while scientific research trials attempts to clarify the interactions of symbionts in this type of nitrogen fixation as well as the influence of abiotic factors on its efficacy. A field experiment was conducted to investigate the influence of garden pea cultivars ('Alicia' and 'Miracle of America'), seed inoculation with nodule bacteria (Rhizobium pisi DSM 30132, and Rhizobium leguminosarum bv. viciae OS-103), and nitrogen fertilization (0, 30 and 60 kg N*ha -1 ). The observed parameters are: stand density, number of pods, mass of 1,000 grains, mass of pods and grains and grain yield. It was established that all the investigated factors significantly influenced the traits. The seeds inoculated with the indigenous strain R. leguminosarum bv. viciae OS-103 had significantly increased numbers of pods per unit area, grain yield, and the weight of 1,000 grains, while a higher amount of applied nitrogen resulted only in an increase of grain yield. Cultivar 'Alicia' achieved a significantly higher grain yield compared to the 'Miracle of America' cultivars, while application of 60 kg N*ha -1 achieved statistically higher grain yield compared to control. Inoculation with R. leguminosarum bv. viciae OS-103 produced a significantly higher grain yield compared to inoculation with the reference strain R. pisi DSM 30132. The observed parameters were significantly influenced by the garden pea cultivar, seed inoculation with nodule bacteria, and nitrogen fertilization therefore further investigation are needed with new inoculant strains and new cultivars under different agroecological conditions. Keywords: grain yield, nitrogen application, nodule bacteria, pea cultivars, yield components 889 Journal of Central European Agriculture, 2017, 18(4), p.889-901 DOI: 10.5513/JCEA01/18.4.1981 889 Journal of Central European Agriculture, 2017, 18(4), p.889-901 DOI: 10.5513/JCEA01/18.4.1981 889 Journal of Central European Agriculture, SažetakBiološka fiksacija dušika predstavlja predmet mnogobrojnih istraživanja znanstvene zajednice. Prednosti ovog procesa, kao što je već dobro poznato, su mnogobrojne dok se znanstveno-istraživačkim pokusima nastoje razjasniti interakcije simbionata u ovoj vrsti fiksacije dušika kao i utjecaj abiotskih faktora na njenu djelotvornost. S ciljem ispitivanja utjecaja kultivara vrtnog graška ('Alicia' i 'Čudo Amerike'), inokulacije sjemena kvržičnim bakterijama (Rhizobium pisi DSM 30132 i Rhizobium leguminosarum bv. viciae OS-103) i gnojidbe dušikom (0, 30 i 60 kg N*ha -1 ) proveden je poljski pokus. Promatrani parametri su uključili: sklop biljaka, broj mahuna, masu 1000 zrna, masu mahuna i zrna i prinos zrna. Rezultati istraživanja su potvrdili kako su svi ispitivani faktori značajno utjecali na ispitivana svojstva. Inokulacija sjemena sojem OS-103 značajno povećava broj mahuna po jedinici površine, prinos zrna i masu 1000 zrna, dok se pove...