The soil tillage is still the most complicated agro-technical measure where more than 30% of the total energy is deployed for the plant production. In the field conditions, the effect of rotary tiller as well as other machines for the supplementary treatment of the soil structure aggregates was examined in this study. The following tools and machines were used for the soil tillage: harrow (HA), rotary tiller (RT) and disc harrow (DH). In particular, it is interesting to determine the effect of rotary tiller and other machines for the soil tillage on the treatment quality as well as on the excessive attrition and making the powder structure and its degradation. By the soil tillage with different tools and machines (harrow, rotary tiller, disc harrow), there were changes in the condition of the soil aggregates, i.e. the decrease of the total content mega structural aggregates for 17.72%. At the soil treatment by rotary tiller (RT), the statistically significant higher values of the structure coefficient ratio were found in regard to the tillage with the harrow as well as the disc harrow for all examined depths 1.94-2.75 and high content micro structure aggregates (diameter <0.25 mm) of 6.37%. The values of volumetric mass before the tillage were in the great range from 1.06 to 1.29 g/cm 3 depending on the depth, while the average values of the volumentric mass (VM) of the examined soil after the treatment were in the range from 0.92 to 1.17 g/cm 3. By testing the ratio of volumetric mass (X ZM), the statistically significant differences were determined for the type of treatment while the measured depth has not shown the statistically significant difference. Contrary to the ratio of volumetric mass (X ZM), the ratio of structure coefficient (X k) showed a significant difference in the soil treatment by rotary tiller while the measured depth had a statistically significant differences in all three variances.

The paper presents the types of wetlands habitat Gromizelj which is of Europeanimportance. The review is made on the basis of studies of flora and vegetation andthe Guide of the types of habitats according to the European Union (EU) HabitatsDirective. Swamp Gromizelj is located in the northeast of Republic of Srpska (RS)and Bosnia and Herzegovina (BiH), in the municipality of Bijeljina. During theresearch the following habitats have been isolated: 3150 Natural eutrophic lakeswith Magnopotamnion-or Hydrocharition-vegetation type, 3270 Muddy river bankswith Chenopodionrubrip. p. and Bidention p. p. vegetation, 6430 Hydrophiloustall-herb fringe communities of plains and of the montane to alpine levels,Reedbeds, tall sedges and vegetation of Phragmito-Magnocaricetea, 91E0 Alluvialforests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnionincanae,Salici-onalbae) and 91F0 Riparian mixed forests of Quercus robur, Ulmus laevisand U. minor, Fraxinus excelsior or F. angusti folia, along great rivers (Ulmenionminoris).

Alfalfa has a great need for water, because it creates a huge plant mass. For this reason, yield level, similar to the other species with large green mass, primarily depends on provided water during the growing season. Alfalfa uses water well from the prevegetation reserve in land, especially of rainfall during the growing season. In this paper, the need for water in alfalfa for average, the most rainy and dry hydrological year in the conditions of Sarajevo area was established. Evapotranspiration of alfalfa is 567 mm for the most dry, 569 mm for the most rainy and 540 mm for average hydrological year. Water deficit occurs in May, June, July and August in the amount of 323.9 mm for the most dry, 178.4 mm for the most rainy and 222.1 mm for average hydrological year. In the study area, alluvial soil is predominant (fluvisol), which is of a light mechanical composition (sandy loam) and favorable chemical characteristics for alfalfa growing.

Since the production area of forage peas is begin to increase, the experiment was set up at two localities, Banja Luka and East Sarajevo. For experiment was used five domestic varieties Saša and NS Junior from Serbia. The experiment was carried out with three types of fertilization (without the use of mineral fertilizers, basic fertilization with NPK and basic fertilization by NPK + nitrogen addition). The variety Saša had the highest yield of green mass and hay. The application of basic fertilization had the influence on tested parameters, while the application of basic fertilizer in combination with topdressing had poorer results. Agro-ecological conditions had the influence on yield of hay, so greater results are achieved on experimental field East Sarajevo.