This study aimed to evaluate the effects of salinity in the growth and nitrogen fixation in leucaena. Plants were cultivated in Leonard pots containing clean and sterilized sand. The treatments were distributed in a completely randomized design, in a 3x3 factorial, with five replicates. The first factor corresponded to no inoculation and inoculation with Bradyrhizobium sp SEMIA 6070 and SEMIA 6153 strains. The second factor corresponded to NaCl concentrations: 0, 25 and 50 mol m-3. Were analyzed the height and dry matter accumulation, the number of nodules and nitrogen in plants. The inoculation of plants with the strain SEMIA 6070 provided higher growth and greater nitrogen accumulation in plants thar were not subject to salinity. Nodulation was not affected by salinity. Inoculation with SEMIA 6153 strain provided greater tolerance to salinity.

The goals of this work consisted of identifying the prevalence of helminth eggs in household organic wastes generated in the urban zone of cities of the semiarid of the Paraíba. The work was accomplished from June to December of 2006 in 30 homes in the urban center of Cabaceiras, 30 in Caraúbas and 50 in Queimadas. Organic solid residues were collected during in three consecutive weeks and alternate days (Monday, Wednesday and Friday) in the generating source. For quantification of the helminth eggs three composed samples were picked up by city, resultants of ten fractions of organic solid residues collected in the homes. The amount of helminth eggs varied from 12.82 to 14.39 eggs/gST, with viability of 95.42%. In prevalence order, they enrolled Ancylostoma sp., Enterobius vermiculares, Fasciola hepatica and Ascaris lumbricoides. The eggs of Ancylostoma sp. were identified in 100% of the examined samples. The terrible sanitary quality verified for the household organic waste solid in three cities, located geographically in the area of the paraiban semiarid they suggest that these residues constitute important source of contamination to the environment and the human being, requesting the appropriate management.

This study aimed to evaluate the occurrence of weeds and the performance of common bean grown on different types of plant residues managed with herbicides, in a no-till system. The treatments were arranged in split plots in a randomized block design with three replications. Prior to sowing common bean in the no-till system, plant residues of sorghum, maize, jack bean, sunflower, stylosanthes, rice, soybean and weeds were spread on the plots. Common bean was sown after chemical drying of the cover species. The two secondary treatments in split plots after bean sowing consisted of herbicide absence and the use of a mixture of the herbicides fomesafen (applied at a rate of 100 g ha-1 , 20 days after bean emergence-DAE) and quizalofop-p-ethyl (applied at a rate of 70 g ha-1, 25 DAE). Sorghum produced highest amounts of straw as well as the best soil cover. The plant residues did not influence the establishment of common bean. Herbicide application controlled weeds efficiently. However, the effects of mulch on weed control did not influence bean yield. The treatments influenced the number of pods per plant and grain yield of the bean yield components, with higher values in herbicide-treated plots.

In the handling for the quality of grapes without seeds the use of gibberellic acid (GA3) in association with synthetic cytokinin of character is common not purics derivatives of the urea, being the most common TDZ (N-fenil-N-1,2,3-Thidiazol-5-il urea) and the CPPU (n (2-chlorine-4-pridil) - N-feniluréia). The present work had for objective to study the effect of the cytokinin of character purics: BAP (6-benzilaminopurina), associate with the gibberellic acid (GA3), in clusters of the cv. Superior Seedless, in the Valley of the San Francisco. The evaluated characteristics had been the mass fresh weight (g), diameter (mm), length (mm) and volume of berries (mL), soluble solid (SS), titratble acidity (AT) and relation SS/AT. It was verified that the GA3 in the concentration of 10 mg.L-1 associated with 10 mg.L-1 and 20 mg.L-1 of BAP had promoted the increments most significant in the quality of clusters of the cv. Superior Seedless.

The gallery forest and other unequal vegetal areas of semiarid suffered the antropized influence but this first kind of vegetation has been less studied. The floristic composition and phytosociological study of the woody representatives in the riparian forest of the Bodocongó River, semi-arid of the Paraíba State, it was studied through of the insertion of four transects perpendicularly to the water body in and each transect were plotted three parcels with 10x20 m. It was used Mata Nativa II program to calculate phytosociological parameters. The analyzed vegetation was represented by 357 individuals belonged to 16 genera and 7 families. The species that presented the most number of individuals were: Prosopis juliflora (221), Croton sonderianus (52), Pithecellobium dulce (20) and Ziziphus joazeiro (14). Prosopis juliflora occurred in all studied areas demonstrating its aggressive characteristic and also showing the susceptibility of areas that passed by human influence to invader areas. The highest importance value of quantity of species (VI) was Prosopis juliflora (49.22%), allowed for Ziziphus joazeiro, Croton sonderianus and Pithecellobium dulce. It was demonstrated that the bordering forest of Bodocongó River hasn't contain an expressive floristic composition that it is related probably to the influence and degradation resulting from human action.

The cultivation of the strawberry is concentrated in the states of the Southeast and South of the country contributing to generating direct and indirect jobs. The opening of new frontiers in atypical climate conditions for the cultivation, such as regions having higher temperatures, has been investigated. The leaf topography interferes with pathogenicity and deposition of pesticides. This study aimed to analyze the performance of 11 cultivars of strawberry in the tropical conditions of the Mesorregião Mata of the Pernambuco state. The cultivation was done in screenhouse where topographical characters of the median leaves of cultivars were evaluated. The experimental design was Completely randomized, with five replications, being each pot a plot. Dover, Oso Grande and Tudla cultivars showed leaves with a flatter relief. The cultivar Sweet Charlie presented a more rugged topography. Considering the conditions of this experiment, the cultivars Dover, Oso Grande and Tudla were those that presented the most potential to pesticide absorptions.

The objective of this work was to study the behavior of ten soybean [Glycine max (L.) Merr.] cultivars using the electrical conductivity (EC) test by the comparison of curves of the accumulative electrolyte leakage along the time and to establish the statistical model that allow the best adjust of the curves. Ten soybean cultivars were used and they were mechanically harvested in 2004 in the EEA Oliveros, Santa Fe, Argentina. Measurements of EC were made for 100 individual seeds of each cultivar during 20 hours of immersion at intervals of 1 hour using an equipment that permit an individual seed analysis (Seed Automatic Analyzer SAD 9000S). There were proposed two statistical models to study the EC along the time of the 10 cultivars studied using SAS Statistics Program, to select the model that better allow us to understand the EC behavior along the time. Model 1 allowed to make comparisons of EC along the time between cultivars and to study the influence of the production environment on the physiological quality of soybean seeds. The time to reach the stabilization of the EC must not be lower than 19 hours for the different cultivars.

At present, the preference of the internal and external markets is for small fruits. Therefore the size, other aspects equally are important and considered to determining harvest point how soluble solids, coloration and format. The objective of the present work was determined the physical-chemical changes during the development of watermelon 'Quetzali' with support for the harvest in the size demanded by the extern market. Six harvests were made, the first occasion of marks made on fruits with fresh weight of 2 g and the other at 10, 15, 20, 15 and 30 days of development. Next, the fruits were transported for the laboratory of Irrigated Agriculture of the UFERSA, in Mossoró-RN-Brazil. The experiment was installed in design entirely at random composed by five treatments (days of development), five replications and a fruit for replication. Fresh mass was analysed (g), growth rate of the fruit (g.day-1), length and diameter of fruit (cm), firmness of the pulp (N), vitamin C (mg.100 mL-1 ascorbic acid), soluble solids (SS, %) and titratable acidity (AT, g.100 mL-1 acid malic). The watermelon variety Quetzali obtained the very growth rate of 178.64 g to 20 days and the very diameter of 19.57 cm to 25 days, when size adapted for harvest. To 25 days of development the fruits had firmness of pulp 15 N, soluble solids 8.9%, titratable acidity 0.1289 mg.100 mL-1 acid malic and vitamin C 7.3 mg.100 mL-1 ascorbic acid.

The aim of this work was to evaluate some empirical equations performance used to estimate the evapotranspiration of reference in relation to the standard method Penman-Monteith FAO - 56 for the climatic conditions of the city of Eunápolis - BA. Climatic variables were used as referrals to the years of 2006 to 2007 obtained through the automatic platform collection of data from Hydrical Resources Superintendency of Bahia / National Institute for Space Research, where it was obtained the average for two years. In order to compare the values of ET0 estimated by empirical equations with the standard method Penman-Monteith (FAO 56), were considered the parameters of the regression equation (a and b), the coefficient of determination (r²), coefficient correlation c, estimate of the standard err (EEP), index of agreement (d), index of confidence or performance c, in the scales of one, three, five and seven days. The results obtained from this study reveal that the Hargreaves-Samani method overestimated the ET0 in 23% characterizing it as the less method to estimate it. The methods of Radiation and Blaney-Criddle satisfactorily met the estimate of ET0 for the climatic condition on the studied region.

The aim of this study was to evaluate the production of Freshwater Angelfish (Pterophyllum scalare) in different stocking densities in cages polycultured with Amazon River Prawn (Macrobrachium amazonicum). Four treatments were evaluated (1; 2; 3 and 4 fish.10 L-1) using two ponds and 24 experimental units. Water quality parameter reached adequate levels for the species. Production data were submitted to ANOVA. Fish produced in the lowest density showed higher values of final weight and standard length, and lower total biomass in comparison with the others treatments. Feed conversion rate, survival, batch uniformity and body factor were not significant different among treatments. The highest density tested produced more fish and gross yield than the others treatments. The density 20 fish.10L-1 is recommended to produce Freshwater Angelfish in cages polycultured with Amazon River Prawn.