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From previous studies, it was found that the most important pluviometric indicators which characterize the frequency, intensity and spatial distribution of drought in Prut River floodplain are the standardized precipitation index, Hellmann's criterion and Topor aridity index. Standardized precipitation index values between (-1.5) and (-1.0) indicates a high frequency of the moderate-dry periods and very dry ones reached 2.3 %. Autumn shows moderate - dry traits in 13.5% of the years and can be very dry only for 9% of the cases from 1979 until 2013. To forecast drought through the standardized precipitation index, it is estimated that if severe periods occur in autumn, will be extended throughout the winter period and for the whole next (year) growing season. A severe drought which began in autumn of 2011 remained throughout the winter until the next growing season (2012). To strengthen this study, a characterization of months using Hellman's criterion was carried out. The authors laid emphasis on the excessively rainy months and the excessively dry months, the latter had a higher weight. Topor aridity index results showed a dry substance in 1982, 1985, 1986, 1989, 1992, 1997, 2000, 2002, 2003, 2004, 2006, 2008, 2009, 2011 and 2012 respectively. The incidence of droughts in the Moldavian Plain resulted in a sharp decrease in the runoff and the appearance of a drying - up phenomenon in the middle basin of Prut River. Rivers dried up at a frequency of 40 - 50 % in river basins with a surface area of 15 - 20 km2 and over 90 % in river basins with areas less than 5 km2. [ABSTRACT FROM AUTHOR]

Lawns are established with perennial grass species and varieties mixed in different proportions, to create various types of turfgrass mixtures that meet certain requirements of utilisation or can adapt to specific climatic conditions such as excessive drought or strong shading. In our study were analyzed the nitrogen content in plant tissue and visual quality of three different turf mixtures under the influence of differentiated fertilization and the pedoclimatic conditions in the NE region of Romania. The first mixture (M1) was composed of Festuca arundinacea 80% + Lolium perenne 10% + Poa pratensis 10%. The second mixture (M2) consisted of three varieties of Lolium perenne mixed in equal proportions. The third mixture (M3) was composed of Festuca rubra 60% + Lolium perenne 20% + Festuca ovina duriusculla 10% + Poa pratensis 10%. Three types of fertilizers were applied: ammonium nitrate, a complex fertilizer with nitrogen and phosphorus and a commercial lawn fertilizer with macro and micronutrients. The experimental design was a split plot design with three replicates. Mixtures reacted positively to all three types of fertilizers. The highest nitrogen content was registered at the mixture M2 (2.33% nitrogen in DM). Considering the fertilizer used, the highest nitrogen content was determined at the fertilization with ammonium nitrate (2.32% nitrogen in DM) and the lowest concentration was registered at the control plot where fertilization was not applied (2.09% nitrogen in DM). Statistical interpretation of the data was done by analyzes of variance and limit differences. [ABSTRACT FROM AUTHOR]