The use of mine gypsum in reclamation of soils with high levels of exchangeable sodium is viable by its effectiveness, and although this product show others advantages as low price and easy applicability in field. The product is finding in great amount at the Araripe Highland, located across (between) the division of the Ceará and Pernambuco states. The aim of the research work is to evaluate the shoot dry biomass and Ca+2, Mg+2, K+, P and Na+ accumulation on cowpea plants grown in two saline sodic soils recently amended with gypsum. The experiment was carried out in a completely randomized factorial design with three replications, applying 6 levels of gypsum in two soils. The statistical calculations were achieved using the Program SAEG 9.0 and the standard deviations and the averages were compared by the Tukey test at probability P < 0.05. The effects of gypsum levels and the relationships between the variables were analyzed by the Pearson correlation test. Application of gypsum in different levels reduced sodium uptake and increased shoot dry biomass of cowpea plants grown in the Neossolo Flúvico Eutrófico Saline Sodic soil with medium texture. Higher levels of gypsum promoted reduction in phosphorus accumulation on cowpea plants grown in the Neossolo Fluvico Eutrófico saline sodic soil with medium texture.

This work aimed to evaluate the influence of light and temperature on germination of Hyptis suaveolens seeds. The seeds were harvested at Mossoró/RN city and the experiment developed in at the Laboratory of Seed Analysis of the Department of Agriculture of the Federal University of Lavras at Lavras/MG. The treatments was consisted of four temperatures (20ºC, 25ºC, 30ºC and 20-30ºC) and two light conditions (light and darkness). The treatments consisted of 200 seeds, with four repetitions of 50 seeds each, sown on a two Germitest towel paper, displayed inside gerbox, and maintained for 30 days in germination chamber. A completely randomized constituted design with 2x4 factorial design (two light expositions x four temperatures) was used with 4 replicates of 50 seeds. The Scott-Knot¿s Test at 5% of probability was used to compare the obtained averages. There was significant difference in the interaction temperature x shines, in the two variables. It can be concluded that the largest germination of seeds happened in the light presence and in high temperatures. And that the temperatures alternated of 20-30ºC, 30ºC and 25ºC are favorable for germination of seeds of Hyptis suaveolens.

The decrease in pore that are submitted to the certain pressure, causes an increase soil bulk density, causing the compactação process, affecting the ideal development of crop root system. Consequently the present study has as obejective to evaluate the effects of different compaction levels in two soils with differrent textural classes on the yilol of aerial biomass and root of radish. The experiment was carried out in a green house at the, UFRPE, where two samples of soils from 0-20 cm with the following textural classes: sand clay loan (NITOSSOLO) compacted to bulk densities of 1,05; 1,26 and 1,47 g cm-3 and sandy (PLANOSSOLO) compacted to densities of 1,54; 1,76 and 1,98 g cm-3. A severe reduction was observed in the production of bulbs a function of the levels compaction where in the sand clay loan texture there was no development of the bulbs in the density of 1,47 g cm-3, differing from at observed in the sandy texture soil, where the largest density (1,98 g cm-3), showed development of the bulbs. The compaction in subsurface alters the distribution of the root system of he crop along the profile of the soils, without decrease in the production of roots.

Nematodes are abundant metazoans in all ecosystems with some species surviving in extreme conditions. The sand dunes are dynamic systems and are always in a state of successional change in terms of succession and only recently has the distribution and succession of soil animals in coastal dunes been given wider attention. This research focused on to describe the trophic structure of nematode community associated with two stages of a vegetation succession in a coastal moving sand dunes ecosystem in the north shore of the Rio Grande do Norte State. Five sites were classified in two stages of an ecological succession defined as "beach" and "deflation hollows among dunes" where samples of soil, roots and shoots were collected. Nematodes were extracted from the soil by centrifugal flotation procedure and from the roots by this method associated to blender trituration and classified in families and trophic groups according to feeding habits. The structure of nematode fauna was described by maturity index, plant parasite index and modified maturity index and fungal feeders/bacterial feeders and omnivores+predators/bacterial feeders+fungal feeders+plant parasites rates. The ecosystem was characterized by low diversity of families which composed trophic groups, low values of maturity indexes and omnivores+predators/bacterial feeders+fungal feeders+plant parasites ratio and low abundance of dorylaimids. These datas reflected high level of disturbance which this habitat faces.

This experiment had for objective to evaluate some parameters of quality of the bee honey (Apis mellífera L.) produced by IAGRAM and commercialized in the city of Mossoró-RN. For this, 19 honey samples had been collected in the local market, these were analyzed, in the Chemistry Laboratory of the Universidade Federal Rural do Semi-Árido (UFERSA), how much to the color, humidity, total acidity, reducing sugars, apparent sucrose and diastase activity. It was utilized districted statistics for analysis of date, with shunting line standard, reliable interval and distribution of frequency. The honeys sample presented the colors clearly extra amber (5,2%), amber (5,2%) and dark amber (89,4%). The honey samples presented normal standard established for the Brazilian Legislation as humidity percentage (14,3 18.6%) and reducing sugars (66,9 75.0%). About 5,2% and 42% of the analyzed honey samples, not presented, respectively, apparent sucrose content and total acidity, as the standard established for commercialization as floral honey. The diastase activity was remained inside of the quality standard.

To have high yields it is necessary that seed of good quality be sowing and, to produce them, mother plants should receive appropriate treatment, like fertilization. Aiming evaluate how copper and zinc fertilization, in three types of soil, and its influence in physiological quality of sorghum seeds, in an experiment in randomized blocks with tree replicates. The treatments were a combination of five levels of Cu (0,0; 0,26; 0,90; 1,54; 1,80 mg kg-1 of soil) and five levels of Zn (0,0; 0,32; 1,10; 1,88; 2,20 mg kg-1 of soil), resulting in nine treatments in experimental matrix Central Box. Seeds produced were analyzed of hundred seed weight, germination and vigor (germination first count, IVG, emergence, emergence first count, IVE and seedlings dry matter). The levels of copper and zinc increased hundred seed weight and vigor tests. Plants cultivated in Haplustalf produced seed with the best quality.

The experiment was carried out to determine the effect of intermittently drain tilapia ponds for vegetable irrigation. A completely randomized design in a factorial arrangement 2X3, with three replications was used in this experiment. The first factor was kind of feed: feed 1 - without animal ingredients; feed 2 - with the inclusion of shrimp meal; and feed 3 - with the inclusion of fish meal. The second factor was pond drainage scheme, where in the scheme 1, ponds were intermittently drained for irrigation and subsequently refilled; and in the scheme 2, ponds were not drained. Sexually reversed Nile tilapia (Oreochromis niloticus) with average weight of 1.66 g were randomly stocked at the experimental ponds, with thirty five fish per tank, in a stock density of 1.25 fish per m2. Fish were fed two times a day in a proportion of 5% of body weight. There was a significant effect for tank drainage scheme for the variables feed conversion ratio and survival (P<0.05) where tilapias cultured on ponds intermittently drained for irrigation had higher survival and better feed conversion ratio. There was no significant effect (P>0.05) on the interaction between kind of feed and tank drainage scheme for any of the studied variables. Feed type and pond drainage scheme had no effect on weight gain (P>0.05). Therefore, it can conclude that intermittently drained fish ponds, for irrigation, results in the best tilapia's performance in terms of feed convertion and survival.

The experiment was conducted at "sitio cantos" of UFERSA, to evaluate the green mass production and the effect of the cut age (42, 56, 70, 84 and 98 days) on chemical-composition of the canarana erecta hay, cultivated in semi-arid climate area. The DM, CP, OM and ashes levels were affected by treatments. The age of 42 days presented production of green matter (45,88 ton/ha/year), and the CP (6,64%), EE (2,15%) and ash (14,08%) levels superior to the other ages, being therefore the more indicated for haymaking.

The design of a lateral line was an applied tool with the objective of determining, accurately, the lateral line final pressure, considering the presence of a hydraulic cannon or not in the final extremity of the piping; so that the irrigation planner has the exact science of the entrance pressure in the central pivot. Being able to like this, design projects more optimized in terms of energy. The evaluation of the system provided the rebuilding of the curve of control of the equipment taking to the producer the reality of his/her overhead irrigation. The hydraulic project of the system provides the visualization of the theoretical behavior of the system that, when compared, to the real behavior, position in execution, it can serve as auditing for ends of correction of the possible flaws, be of project and production or of execution.

O objective this work was to estimated genotypic, phenotypic and environmental among traits of melon. Six hybrids of melon and their fifteen populations in diallel crosses were evaluated in a randomized complete block design with three replications. The traits assessed were yield, number total of fruits, average fruit weight, longitudinal diameter, transversal diameter, pulp thickness, pulp firmness and soluble solids content. The correlations between yield and total number fruit and yield and average fruit weight were positives. The total number exhibited negative correlation with average fruit weight and solids soluble content. The correlations of the solids soluble content with average fruit weight, pulp thickness and pulp firmness ware positives. However, pulp firmness and pulp thickness exhibited association negative. The undesirable associations detected in the present work were not sufficiently strong, indicating that is possible to obtain recombinants individuals in the segregating populations evaluated.