37 research outputs found

    SOME POSSIBILITIES OF VEGETATIVE PROPAGATION OF STRAWBERRY CULTIVARS IN VITRO

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    This work presents the production technology of five strawberry cultivars by micropropagation. Starting materials were taken in May or June from the stolons that were in the air and meristems of 0.5mm were isolated in the laboratory. The isolated strawberry meristems were cultivated in a medium containing macro and micro elements and phytohormones in different concentrations. The highest percentage of initiated culture was recorded by the cultivar Senga Sengana (81.48%) and the lowest by the cultivar Marmolada (48.00%). Optimal hormone balance for initiating culture strawberries was 1.0 mg / l BAP (Benzylaminopurine), 0,1 mg / l IBA (indole-3 -butyric acid) and 0.1 mg / l GA3 (gibberellic acid). After 50 days of cultivation in the culture, the formed shoots were transferred to medium for multiplication. The multiplication of isolated buds was achieved on the medium with phytohormones BAP and IBA. The highest multiplication index was recorded by the cultivar Senga Sengana (8.77) and the lowest by the cultivar Marmolada (5.42). When planlets reached a height of 10-12mm they were transferred to the rooting medium. The optimal concentration of phytohormones IBA for rooting of the strawberry cultivars was about 5 mg / l. Number of roots ranged from 5.09 for the cultivar Idea to 6.11 for the cultivar Senga Sengana. After two months the plants with developed roots were transplanted into peat briquettes. Adjustment by external conditions was conducted in greenhouses under a mist system. The reception was submitted well by the planted strawberries (90%). The results presented in this paper indicate that micropropagation can speed up the process of getting healthy and HIGH quality planting material ofstrawberries. The procedure for obtaining strawberries by micropropagation can be accelerated by proper selection of the combination and concentrations of phytohormones

    Uticaj klimatskih uslova područja na prinos pšenice

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    The aim of this study was to analyze the influence of climatic conditions in the city of Leskovac, in the period from 2000 to 2008th year, the yield of wheat. This paper presents the average yield of wheat according to the mean monthly temperature and total precipitation during the vegetation period. So they separated two years ago (2003) when he achieved the lowest yield of wheat in the territory of Leskovac (2.4 t ha-1) and the 2004th years ago, when achieved the highest average yield in the period (3.7 t ha- 1). The average yield in the year with favorable schedule and rainfall, and average air temperature was higher by 1.3 t ha-1 of the unfavorable climatic conditions. Deficiency, poor distribution of rainfall, high average temperature, and temperature fluctuations during the growing negative impact on wheat yield. By choosing a variety that is more tolerant to drought, as well as quality and timely application of agro-technical measures can mitigate the adverse impact of climate conditions on the yield of wheat fields.Cilj ovih istraživanja je bio da se analizira uticaj klimatskih uslova na području grada Leskovca, u periodu od 2000.-2008. godine, na prinos pšenice. U radu su prikazani prosečni prinosi pšenice u zavisnosti od srednjih mesečnih temperatura i ukupnih padavina u periodu vegetacije pšenice. Tako su izdvojene dve godine (2003), kada je ostvaren najniži prinos pšenice na teritoriji Leskovca (2.4 t ha-1) i 2004. godina, kada je ostvaren najviši prosečan prinos u posmatranom periodu (3.7 t ha-1). Prosečan prinos u godini sa povoljnijim rasporedom i količinom padavina, kao i srednjom temperaturom vazduha bio je veći za 1.3 t ha-1 od godine sa nepovoljnim klimatskim prilikama. Nedostatak, loš raspored padavina, visoke prosečne temperature, i temperaturna kolebanja u toku vegetacije negativno utiču na prinos pšenice. Izborom sorte koja je tolerantnija prema suši, kao i kvalitetnom i pravovremenom primenom agrotehničkih mera može se ublažiti nepovoljan uticaj klimatskih prilika područja na prinos pšenice

    Photoelectrochemical properties of sol–gel obtained titanium oxide

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    The photoelectrochemical properties of a sol–gel prepared titanium oxide coating applied onto a Ti substrate were investigated. The oxide coating was formed from an inorganic sol thermally treated in air at 350 °C. The coating consisted of agglomerates of narrow size distribution around 100 nm. The photoelectrochemical characteristics were evaluated by investigating the changes in the open circuit potential, current transients and impedance characteristics of a Ti/TiO2 electrode upon illumination by UV light in H2SO4 solution and in the oxidation of benzyl alcohol. The electrode was found to be active for photoelectrochemical reactions in the investigated solutions

    The stability of emulsions in the presence of additives

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