Considering the Sumé Irrigated Perimeter revitalization process the present work aims, throughout the soil chemical characterization of the area diagnostic the soil situation and offer subsidies to allow an adequate soil management. On the experimental area (33 plots totalizing 33 ha) soil samples were collected at 0-20 cm depth and characterized chemically. The obtained results were statistically using classical descriptive statistical techniques. With the exception of the organic matter, the others chemical properties are in adequate levels for the crop development. It is recommended, however, the incorporation of organic matter in the area soils. No salinity or sodicity hazards were founded in the analyzed soil samples. Different variation coefficients were observed on the analyzed chemical properties.

The objectives of this research were to report Meloidogyne mayaguensis on seedlings of guava (Psidium guajava) cv. "Paluma" in commercial nursery in Assu municipality and in commercial field of pipper (Capsicum annum) cv. "Comandante" in Baraúna municipality, in Rio Grande do Norte State and to notify all of segments involved to commercial growing of fruits and vegetables about the risk that seedlings infected by this pathogen represents to the agro-centers of Rio Grande do Norte and Ceará States. Concerning to both reports the identification of pathogenic species was made by the a-esterasic fenotype characterization. The present reports of M. mayaguensis represent the second and the third ones in Rio Grande do Norte State,having been made the first one on plants of guava in Touros municipality. Meloidogyne mayaguensis can represent a threat to commercial growing of fruits and vegetables if eradication and exclusion methods of control will not beused.

There is an interest in the knowledge about the fertilizing requirements of melon crops, explored at Pólo Agroindustrial Assú/Mossoró/Baraúnas, Rio Grande do Norte, Brazil, aiming at obtaining high productivity levels for quality fruits, reducing fertilizer wastes, and decreasing environmental degradation. The objective of this work was to evaluate the effects of applications of nitrogen (urea) and potassium doses (potassium chloride) on yield and quality of Gold Mine, yellow melon fruits under drip irrigation. Nitrogen doses (0, 50, 100, and 150 kg N ha-1) were combined in a factorial arrangement with potassium doses (0, 50, 100, and 150 kg K2O ha-1) and applied in a randomized complete block design with five replications. Nitrogen increased the number and total mass of fruits, number of marketable melon fruits, and fruit length/width shape ratio; decreased pulp firmness; but did not change pulp total soluble solids content. These effects were independent from potassium doses, which did not influence the evaluated characteristics.

The obtaining of seedlings of high quality in organic agriculture still represents a challenge, especially with relationship to the concentration of nutrients and the physical properties of the substrate. The objective this research was evaluated effect of cast earthworm as organic component of substrate for production of collard greens-butter seedlings. Two experiments were installed in greenhouse in the Universidade Federal do Acre, both in design completely randomized with eleven treatments and eight replications. The treatments were obtained through of mixtures of different cast earthworm concentrations (0, 10, 20, 30, 40, 50, 60, 70, 80, 90 e 100%) and soil, being dystrophic (V = 29 %) in the experiment I e eutrophic (V = 80 %) in the experiment II. To the 26 days after the sowing was evaluated the height of the plant and dry weight matter masses of shoot, root and total plant. The results of the experiment 1 indicated that addition of cast earthome to soils distrophic increases the growth of the plants, in concentrations greater 70 %. However the results of the experiment 2 indicated that addition of cast earthome in eutrophics soils result in benefits effects for plants only in few quaintly, promoted growth maximum in the concentrations around of 20 %. The results of both experiments indicate that the effect of the cast earthworm as component of substrates was of increasing the growth of collard greens-butter seedlings when the chemical condition of the cast earthworm goes better than the one of the soil in supplying nutritious for the plants.

Aluminium contents in soils from the sugar cane plantation áreas of Pernambuco estate Brazil, are often phytotoxic, specially em subsurfeces. Mineral gypsum has gained growing interest for supplying Ca and demosshing Al saturation, therefore enchancing the root system development. The work was carried out to evaluate the efectts of mineral gypsum applied to on oxisol. The treatments compused five doses of gypsum of two granulometice fraction. For both fractions, gypsum reduced the Al saturation in all the soil. On the other hand, the coarse gypsum was more effective than the fine gypsum one the Al saturation.

With the purpose of evaluating effects of salinity of irrigation water on initial development of rootstocks of guava (Psidium guajava L), an experiment was conducted in greenhouse at Experimental Station of Pacajus, belonging to Embrapa Tropical Agroindustry in the State of Ceará. The treatments in randomized block design consisted of five levels of electrical conductivity of water (ECw: 0.5; 1.5; 2.5; 3.5 and 4.5 dS m-1) and two cultivars of guava (Rica and Ogawa) with four replications. The irrigation waters were prepared maintaining equivalent proportion of 7:2:1 respectively of Na:Ca:Mg. Seedlings were appraised 80 days after emergence, the effects, on number of leaves, plant height, diameter of stem, phytomass of the root and aerial parts, total phytomass, diameter, leaf area and root to aerial part ratio were studied. The increment of water salinity affected growth of cultivar in terms of number of leaves, stem diameter plant height, the Ogawa cultivar was found to be more affected. In highest level of water salinity (4.5 dS m-1) the relative reduction in total dry phytomass in case of cultivar Rica was 63.5% while the decrease in cultivar Ogawa was higher (77.4%); with regard to leaf area the effect was linear with reduction of 17.2% and 18.4%, respectively, for unit increase of water salinity. In cultivar Rica roots and in cultivar Ogawa the aerial parts were most affected negatively by water salinity.

The objective of this work was to evaluate sowing depth and seed dormancy breaking method in the formation of seedlings of the soursup rootstock cv RBR. The experiment was conducted under greenhouse conditions at the orchard of the Lavras Federal University - UFLA. The experimental design was in randomized blocks in a two factors arrangement (4x3), with four replicates and five plants per plot. The dormancy breaking treatments were: witness (control); immersion in water (25 °C for 12 hours); immersion in water (25 °C per 24 hours) and side cut on the seed. The seeds were sowed at 1, 2 and 3 cm of profundity. The characteristics evaluated were germination velocity; germination percentage and after 120 days of sowing the seedlings height (cm); rootsand aerial part fresh matter (g) and roots and aerial part dry matter (g) were also evaluated. There was notinteraction of dormancy brake treatments with the seeds profundity. Seed germination was not influenciated by theprofundity that the seeds were sowed. The side cut on the seed did not provide different results of germination percentage and germination velocity compared to the other treatments, but presented higher of seedlings height.

The aim of this research paper was to make a comparison between the reference values of crop evapotraspiration acquired through the FAO-modified Penman-Monteith and Thornthwaite, Hargreaves-Samani, Blaney-Criddle, the Class A pan and Makkink. Data was obtained from the meteorological station at Boa Vista, in the State of Roraima, Brazil. Results have shown that the methods of Blaney-Criddle tend to be well adjusted to the reference values of the crop evapotranspiration as to those obtained through the FAO-modified Penman-Monteith. The Class A pan showed good adjustments that can be a good alternative for irrigation management in this region.

The contamined soil with the forms infect of the parasites, transmitted by feces of animals, it represents high risk of zoonoses transmission. Among the helmintos species, they meet agents producers of the cutaneous migrans and visceral migrans larvae. In this context, the present work had for objective to contribute for the study of the cutaneous migrans larvae, identifying your agents producers and associate the results with the obtained data of the medical registrations of dermatological center in the Mossoró-RN. The study was accomplished in the Mossoró District and beaches of Areia Branca and Tibau District, region west of Rio Grande do Norte State, removing soils samples of the 29 public squares, 07 schools and 04 beaches, to which was processed at the Laboratory of Animal Parasitology - UFERSA, by modified Baermann method. In overall, 200 samples of soil were collected originating from 40 different places, of these, 35% (14) presented growth for Ancylostoma sp, being distributed in 78,6% (11) squares, 14,3% (2) schools and 7,1% (1) beach. The larger occurrence of the helminto was verified in the months that presented higher pluviometric index and in the studied period 92/770 patients positive for worms migrans cutaneous according the medical registrations.

With the objective of evaluating the production of lettuce seedlings in greenhouse under shading and in floating system, it was installed an experiment in the Federal University of Acre, in the period of November of 2006 to January of 2007. The experimental design was in randomized blocks with four replicates, in split-plot arrangement in strips. The strips corresponded to in the greenhouse and field, the strip, in shading (with and without) and constituting the split-plot, the floating system (with and without). The seedlings were cultivated in trays of polystyrene of 128 cells, containing substrate the base of organic composition, charred peel-of-rice and soil in the proportion of 1:1:1, added 10% of the vegetable coal and 1,5 kg m-3 of termphosphate. The screen with 50% of shading was placed to 50 cm of height. After 24 days of the planting, they were appraised the dry masses of the aerial part, of the root and total of the plant. The largest production of dry mass of the plant's aerial and total part was obtained being used it greenhouse and shading screen. Greenhouse, the floating system without shading presented smaller development of the system root and dry mass total, not differing to each other in the shading condition. The production of seedlings without floating system was better with shading in field and without shading in greenhouse. In the general, the best quality of the seedlings was obtained greenhouse.