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Anastasiu A.-E.,Polytechnic University of Bucharest | Chira N.-A.,Polytechnic University of Bucharest | Banu I.,Polytechnic University of Bucharest | Ionescu N.,National Agricultural Research and Development Institute NARDI | And 2 more authors.
Industrial Crops and Products | Year: 2016

In order to meet the linseed (Linum usitatissimum L.) oil growing demand it is necessary to understand the factors that influence the oil productivity. Among these factors, weather conditions (temperature and rainfall regime) may have an important effect on the development of the linseed plant in different growth stages and eventually on the oil productivity, in the context of a rational water use in drought susceptible agricultural areas. The aim of this study was to establish the influence of weather conditions on linseed oil yield and quality through an extensive field study carried on seven Romanian linseed cultivars grown in the South-Eastern agricultural area of Romania. Nine consecutive crops were analyzed in terms of seed production, seed oil content, oil production, fatty acids profile and iodine index. In order to have a global perspective on the oil production (both quantitatively and qualitatively), two new descriptors (quality coefficient and cultivar efficiency) were defined and computed. Linseed cultivars were classified according to the oil unsaturation degree by means of Principal Component and Linear Discriminant Analysis techniques. The influence of the weather conditions on the linseed crop was analyzed on the basis of a multivariate regression equation correlating cultivar efficiencies with temperatures and rainfall levels (globally expressed as Sielianinov hydrothermal coefficients) within each oil unsaturation group. Based on the results, the May-June period was found critical for the linseed development, because of the accelerated plant growth both in terms of height and branching; during this period, rainfalls are a key factor for obtaining good crops. On the contrary, pronounced drought during May-June may compromise the crop, therefore irrigation is recommended. Irrigation is not necessary during July-August since high temperatures and low levels of precipitations were found beneficial for obtaining good linseed productivities. © 2016 Elsevier B.V.. Source

Toncea I.,National Agricultural Research and Development Institute NARDI | Minca G.,Agricultural Research and Development Station ARDS | Oprea G.,National Agricultural Research and Development Institute NARDI | Voica M.,Agricultural Research and Development Station ARDS
Romanian Agricultural Research | Year: 2015

The organic farming has significant impact on soil fertility, and that includes the soil pH. We performed a nineteen years study (1994-2013) of pH in an organic cropping system on chernozem loam, a slightly acidic soil with 6.3-6.8 pH in aqueous solution, and a two years study (2012-2013) of pH in an organic and a conventional cropping system on stagni-albic luvisol, a clayey and strongly acidic soil with 5.02- 5.03 pH in aqueous solution. During organic management, the pH of the chernozem loam soil decreased significantly and continuously, until 5.4-6.0, and the soil became moderately acid (pH≤6.0) in the period 2006-2007, after 12-13 years from beginning of the organic management. The pH in aqueous solution of the stagni-albic luvisol depended on soil management type: in conventional cropping it was maintained in the limits of a strong acid soil (5.35-5.51), but in organic cropping it changed to very strongly acid (pH≤5.00). The content in available aluminium of the stagni-albic luvisol ranged between 29.65 and 44.70 ppm Al in the conventional management and increased to 50.40-83.62 ppm Al under organic management. According to our results and other similar literature information, the soil acidification is a reality of organic farming. It makes scientific and practical sense to use the pH as indicator of organic management of the soils, because pH represents a central position in chemical and biological processes of the soil and plant growth, and pH measurement is neither difficult nor expensive. © 2015, National Agricultural Research and Development Institute Fundulea. All rights reserved. Source

Chira N.-A.,Polytechnic University of Bucharest | Todasca M.-C.,Polytechnic University of Bucharest | Paunescu G.,Agricultural Research and Development Station Simnic | David I.,National Agricultural Research and Development Institute NARDI | And 3 more authors.
Revista de Chimie | Year: 2011

The subject of this paper consists in authentication of Romanian vegetable oils (type, geographical origin and year of crop) using 1H-NMR data in chemometric analysis. All the oil samples used in this work were extracted from authentic oilseeds obtained from different Romanian agricultural research institutes. Source

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