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A fenntartható mezőgazdasági fejlődésben fontos szerepe van a biotrágyáknak, ugyanis a környezet kémiai terhelése nélkül segítik elő a talaj termékenységének fenntartását, növelik a kultúrnövények ellenállóképességét, valamint javítják a termésbiztonságot és a termés minőségét.

2006-tól 2008-ig természetes alapanyagú lombtrágyák hatékonyságát vizsgáltuk szabadföldi körülmények között Hajdúszoboszló déli termelési körzetében, réti csernozjom talajon. Vizsgálatai célunk annak megállapítása volt, hogy a Natur Vita (Chlorella vulgaris és Spirulina platensis), a Natur Plasma (Chlorella spp.) és az Amalgerol Prémium (alginát, mannitol, laminarin stb.) lombtrágyák képesek e további termésnövekedést biztosítani az alaptrágyázáson felül állománykezelésben és tarlókezelésben. A hatékonysági vizsgálatokat vetőmag kukoricaállományban kezdtük el, majd 2008-ban kiterjesztettük az étkezési burgonya-előállításra is.

A vizsgált készítmények képesek javítani a burgonyaállomány kondícióját, valamint az alkalmazott kezeléstől függően az alaptrágyázáson felül további termésnövekedést biztosítanak, viszont kombinált alkalmazásuk nem eredményez szignifikánsan nagyobb termést, mint a készítmények önmagukban történő kijuttatása.

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The present investigation was conducted to investigate the impact of bio-inoculants on the magnitude and direction of gene effects and mean performance for root length density, root biomass per plant, AMF colonization in roots and micronutrient uptake (Cu, Fe, Mn, Zn) in wheat under low input field conditions. The material for study comprised three wheat cultivars, WH 147 (low mineral input), WH 533 (drought-tolerant), Raj 3077 (high mineral input) and six generations (P 1 , P 2 , F 1 , F 2 , BC 1 and BC 2 ) of three crosses, namely WH 147 × WH 533, WH 533 × Raj 3077 and WH 147 × Raj 3077. The experiment was conducted in a randomized block design with three replications having three treatments, i.e. (i) control; (ii) inoculation with arbuscular mycorrhizal fungi (AMF, Glomus fasciculatum ); (iii) dual inoculation with AMF and Azotobacter chroococcum ( Azc ). The fertilizer doses in all three treatments were 80 kg N + 40 kg P + 18 kg ZnSO 4 ha −1 . Root length density, root biomass per plant, AMF colonization in roots and Zn and Mn content were found to be maximum after dual inoculation with AMF+ Azc in all three crosses. Joint scaling tests revealed that additive-dominance gene effects were mainly operative in governing the expression of root biomass, Cu and Zn content in all three crosses for all three treatments (i.e. control, AMF and AMF + Azc ). Pedigree selection in crosses WH 147 × WH 533 and WH 147 × Raj 3077 could be effective for breeding pure lines of wheat for sustainable agriculture (low input genotypes responsive to biofertilizers such as AMF and Azotobacter ).

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. — Láng I.: 2005. A fenntartható agrárgazdaság és vidékfejlesztés. (Sustainable agriculture and rural development). MTA Társadalomkutató Központ. Budapest. Greenland, D. J.— Szabolcs I. (Eds.): 1994. Soil Resilience

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Lazányi, J. (1996): Results of Westsik's crop rotation experiment for sustainable agriculture. Hungarian Agricultural Research , 5, 4-8. Results of Westsik's crop rotation experiment for sustainable agriculture

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Agriculture and Rural Developement. Vider Plus Bt., Debrecen. 91–117.) Zsigrai Gy. Sustainable Agriculture and Rural Developement

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Biofertilizers are used to improve soil fertility and plant production in sustainable agriculture. However, their applicability depends on several environmental parameters. The aim of our study was to evaluate the effect of free-living bacteria containing fertilizer on the growth of cucumber (Cucumis sativus L. cvs. Delicates) under aluminium (Al) stress. Different responses to Al stress of cucumber growth parameters were examined in terms of root elongation and physiological traits, such as Spad index (relative chlorophyll value), biomass accumulation of root and shoot, Al uptake and selected element contents (Fe, Mn, Zn, Mg) of leaves and root. The applied bacteria containing biofertilizer contains Azotobacter chroococcum and Bacillus megaterium. The dry weights of cucumber shoots and roots decreased in line with the increasing Al concentration. Due to different Al treatments (10−3 M, 10−4 M) higher Al concentration was observed in the leaves, while the amounts of other elements (Fe, Mn, Zn, Mg) decreased. This high Al content of the leaves decreased below the control value when biofertilizer was applied. In the case of the roots the additional biofertilizer treatments compensated the effect of Al. The relative chlorophyll content was reduced during Al-stress in older plants and the biofertilizer moderated this effect. The root/shoot ratio was decreased in all the Al-treatments in comparison to the control. The living bacteria containing fertilizer also had a modifying effect. The root/shoot ratio increased at the 10−4 M Al2(SO4)2 + biofertilizer and 10−4 M Al(NO3)3 + biofertilizer treatments compared to the control and Al-treatments. According to our results the biofertilizer is an alternative nutrient supply for replacing chemical fertilizers because it enhances dry matter production. Biofertilizer usage is also offered under Al polluted environmental conditions. Although, the nutrient solution is a clean system where we can examine the main processes without other effects of natural soils. The soil can modify the results, e.g. the soil-born microorganisms affect nutrient availability, and also can modify the harmful effects of different heavy metals. The understanding of basic processes will help us to know more about the soil behaviour.

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and carbon mineralization — a preliminary investigation. Journal of Sustainable Agriculture 14 :15–25. Stewart D.P.C. Influence of “effective microorganisms” (EM) on vegetative

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1962 Király, Z. 1996: Sustainable agriculture and the use of pesticides. Journal of Environmental Science and Health, 31B, 283

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Hungarian). “AGRO-21” Füzetek, No. 37:50–70. Várallyay, Gy. 2005a. Role of soil multifunctionality in future sustainable agricultural development. Acta Agronomica Hungarica, 51 (1): 109

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and nitrate pollution in groundwater in Japan: present status and measures for sustainable agriculture — Nutrient cycling in agro ecosystems vol. 6392 no. 30 129–137 pp. Kumazawa K

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