Tag Archives: plants

236–243 N. Siņicina and A. Martinovs
Changes in air ions concentration depending on indoor plants activity
Abstract |
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Changes in air ions concentration depending on indoor plants activity

N. Siņicina* and A. Martinovs

Rezekne Academy of Technologies, Faculty of Engineering, Atbrīvošanas aleja 115,
Rēzekne, LV-4601, Latvia
*Correspondence: natalija.sinicina@rezekne.lv
Abstract. Lack of negative ions in the air can cause deterioration

Abstract:

 Lack of negative ions in the air can cause deterioration of the health which is described in many scientific articles. At the same time, an air saturated with negative ions can improve the state of health and provide a comfortable indoor environment. In addition, there are considerable evidences that drowsiness, apathy, headache etc. get even worse indoors, and these health problems may be effectively eliminated with a help of moderate concentrations of negative ions. Literature sources and earlier researches state that plants may be able to produce a variety of air ions, including negative light ions. The most plants emit different types of volatile organic compounds, and the indoor plants can improve the air quality: they effectively remove organic pollution and reduce the number of microorganisms in the air by releasing phytoncides. In this article, the regularity of influence of plants on the number of ions in the room is being proved, basing on a series of experiments performed with the following plants: Spathiphyllum, Pinus mugo, Aloe arborescens, Chlorophytum comosum, Cactaceae opuntia.

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811-822 D.Kostova, M.Kamburova
Determination of manganese with crystal violet in plant material in different fertilization
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Determination of manganese with crystal violet in plant material in different fertilization

D.Kostova, M.Kamburova

Agricultural University – Plovdiv
12, Mendeleev Str., 4000 Plovdiv, Bulgaria
E-mail: deny_kostova@yahoo.com

Abstract:

A study in a multiple-factor stationary field experiment with 16 variants NPK on background with and without annual fertilization with manure was carried out at the Agricultural University in Plovdiv, Bulgaria. The manganese content in the roots of radishes, cultivar Red with white tails, was determined by a new extraction-photometric method with Crystal Violet. The ion-associate of manganese (VII) was completely extracted in a single extraction of only 30 s. The molar absorptivity of the associate was (1.54 ± 0.05) x 104 l mol-1 cm-1. This indicates the high sensitivity of the given reaction. Manganese has been determined by atomic-absorption method, too, in order to compare the results. It was established that fertilization has an effect upon the manganese content in the roots of radishes. The roots of radishes accumulate the highest level of manganese 116.25 mg/kg in a mineral fertilization N:P:K = 3:2:1 with 40 t/ha manure. The relationship between yield and manganese content in radish roots under the influence of fertilization has been established.

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477-488 D. Kostova, V. Kanazirska and M. Kamburova
A comparative analysis of different vegetable crops for content of manganese and molybdenum
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A comparative analysis of different vegetable crops for content of manganese and molybdenum

D. Kostova¹, V. Kanazirska² and M. Kamburova¹

¹Agricultural University – Plovdiv12, Mendeleev Str., 4000 Plovdiv, Bulgaria;e-mail: deny_kostova@yahoo.com
²Vegetable Crops Research Institute, Plovdiv, Bulgaria

Abstract:

The microelements manganese and molybdenum are actively absorbed by plants. The manganese and molybdenum content in 12 widely used vegetable species of the families Fabaceae, Malvaceae, Brassicaceae, Cruciferae were studied to establish the different levels of these elements in their production.Under the influence of nitrogen fertilization (400 mg N / 1000 g soil), different plantspecies, grown under the same soil-climatic conditions, accumulate different quantities of manganese and molybdenum from the nutrient medium. The resulting content varies considerably.Lentils are described with the highest content of manganese, 120.83 mg kg-1 dry matter(family Fabaceae). The concentration of molybdenum is highest in broccoli, 29.53 mg kg-1 dry matter (family Brassicaceae). Brussels sprouts and okra accumulate the least manganese and molybdenum – brussels sprouts, 5.50 mg kg-1 Мn dry matter, оkra, 5.23 mg kg-1 Мо dry matter.The manganese and molybdenum content in the vegetable species were determined by anew extraction-photometric method with Toluidine Blue and Tetrazolium Violet.Manganese and molybdenum has also been determined by atomic-absorption method, inorder to compare the results.

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493-498 H.P. Beck, D. Kostova and B. Zhang
Determination of manganese with Methylene Blue in various vegetable crops
Abstract |

Determination of manganese with Methylene Blue in various vegetable crops

H.P. Beck, D. Kostova and B. Zhang

Inst. Inorg. Anal. Chem. Radiochem.,Saarland Univ. Saarbrucken, D-66123, Germany

Abstract:

A study was made of the manganese content in the crop production of 28 vegetable species, using the most common cultivars within the species. The manganese content was determined by a new extraction – spectrophotometric method using Methylene Blue (MB). The ion – associate of Mn(VII) was completely removed in a single extraction of only 5 s, and the 1,2-dichloroethane layer remained constant for 2 days under the usual laboratory conditions. To compare results, manganese was determined by the atomic – absorption method. The results obtained showed that the manganese content varies significantly in the different vegetable species and cultivars. The manganese content in more widely used varieties of tomatoes, peppers, head cabbage, melons, and radishes was studied in order to establish differences with respect to the level of this element in their production.

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