An experiment was carried out in the vegetable garden of Plant Science Department at the Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró-RN, during the period of June to August 2005, to evaluate the influence of different spacings on rocket economics performance. The experimental design used was randomized complete blocks in a 3 x 4 factorial scheme with four replications. The treatments consisted of the combination of three between row spacings (0,20; 0,25 and 0,30 m) with four within row spacings (0,05; 0,06; 0,07 and 0,10 m). The rocket cultivar grown was 'Cultivada'. Indicators of economic performance were evaluated through gross income, net income, rate of return and profit margin. The highest economics efficiencies were obtained in the following spacings: 0,20 m x 0,05 m; 0,25 m x 0,05 m and 0,30 m x 0,05 m.

This assay was conducted at the Departamento Ciências Vegetais of Universidade Federal Rural do Semi-Árido, with the objective to evaluate the tolerance of the jitirana (aegyptia Merremia L.), in saline solution. The used experimental delineation was the inteiramento casualizado with four treatments and four repetitions. The treatments had evidenced of four levels of salinity: testemunha (0,614ds/m) and the three saline solutions the 10, 20 and 30ds/m. The seeds had been incubadas in the sand esterilizada in caixotes wooden with capacity of 100 sementes.O parameter germination percentage were used as identification character of resistance. Ahead of the displayed one one concludes that the jitirana is tolerant the salinity since the same dS/m came to present reduction in the germination only in the C.E=30.

Moringa oleifera Lam is a leguminous species well adapted to arid and semi arid conditions and is largely used as ornamental for parks and gardens in the animal feeding and human diet and as medicinal. Since research informations on this plant species are scarce, the current work aimed to evaluate the production of leaves, stems and roots dry matter in Moringa oleifera Lam seedlings hidroponicaly grown under physiological conditions or not. The treatments used were the following: (1) nutrient solution containing all required macronutrients (experimental control) or lacking (2) N; (3) P; (4) K; (5) Ca; (6) Mg and (7) S. The Moringa oleifera Lam showed different responses to the imposed treatments. Nutrient solution free of N, P and Mg decreased whole dry matter production (WDM) and increased root to shoot ratios (R/S), however both parameters were not affected in plants grown under absence of K, Ca and S in the nutrient solution.

The slag represent an alternative recommended to replace the traditional source of corrective or fertilizers. This study evaluated different base saturation levels, comparing basic slag to dolomitic limestone as soil acidity corrective agents and in the availability of calcium, magnesium and phosphorus. Thus, one experiment involving soil incubation was conducted in laboratory, during 60 days. The treatments consisted of two corrective agents: dolomitic limestone and basic slag, evaluated by the base saturation method, with eight correction levels (V%) (56, 58, 60, 62, 65, 67, 69 e 71 %) and two replicates. After the incubation period the soil samples was analyzed chemically. The application of the corrective agents promoted efficient neutralization of acidity in soil, especially when basic slag was used. The Ca + Mg level increased depending on the increasing amounts of correctives, reducing the K (Ca2+ + Mg2+)-0,5 ratio. The neutralization of acidity in soil reaction was fast when the slag was used. The soil available P did not increase with increasing levels of soil acidity correctives.

The effect of the plant resistance inducer acibenzolar-S-methyl on in vitro mycelial growth and sporulation of Curvularia eragrostides was evaluated, as well as the time and dosage of its application for the pathosystem yam x C. eragrostides. Five concentrations: 250; 125; 62.50; 31.25 and 15.12 ppm were evaluated for mycelial growth and sporulation of C. eragrostides. The ASM was sprayed onto the leaves of yam plants, at a concentration of 10 g, 20 g, and 30 g of the active ingredient (i.a.) per 100 liters of water, at time intervals of 10, 15, and 30 days before pathogen inoculation. Mycelial growth and sporulation of C. eragrostides was not affect by ASM, at the concentrations of 62.5; 31.25, and 15.12 ppm. Application of ASM was most effective at the dose of 15 g a.i./100 l of water, at 15 days before pathogen inoculation, providing protection against C. eragrostides, with a decrease of up to 76.15 % in yam leaf spot severity.

The word had the aim to evaluate vegetative growing of manicoba function of two management systems, three densities and four plant cuttings. It had been used randomized blocks an sub-divided with factorial (2x3x4) with 5 repetition, being two of management systems (with/without camalhao) and 3 densities of planting (6666; 3333 and 2500 plants/ha) and to sub-parcels four heights (5, 15, 30 and 45 cm). Analyzed variable were: plant height (PLHE), broting number (BRNU), dry matter production (Kg/ha), and ratio leaf/brunch (L/B). Management system and planting density do not manicoba with medium value of 114.4 cm. BRNU increased (P<0.01) with planting cut height of 45 cm and as consequence production increasement of DM of leaves total. Ratio L/B was altered by management system, planting density, cutting height, keeping bigger than other. Among evaluated treatments, cutting height was affected vegetative growing and consequently phitomass accumulation and DM production.

The present research describes the defensive behavior of Haplostegus nigricrus Conde (Hymenoptera: Pergidae) larvae exposed to the stink bug predators Podisus nigrispinus (Dallas), Supputius cincticeps (Stal) e Brontocoris tabidus (Signoret) (Heteroptera: Pentatomidae). The main defensive strategy of H. nigricrus seems to be the regurgitation of toxic compounds and the continuous exhibition by the mouth, because all predators died until 24 hours after the direct contact. Only B. tabidus reached the adult phase with H. nigricus larvae as diet what suggests the higher tolerance and hability for detoxication of chemical compounds from that Symphyta.

The work was accomplished in Santa Luzia Farm in the municipal district of Cruz do Spirit Saint, PB. Located in the coordinates Lat 6° 56'52.21" S and Log 35° 7'57.01" O with the objective of verifying the space variability in what concerns the saturation of aluminum in Interchangeable Catiônica's Complex (ICC). the total area considered about experimental unit was of 49 ha. The area was divided in irregular mesh totaling 39 points, each collection point, besides the limits of the property, it was georreferenciado with a Geodesic GPS. The collection of the soil felt in trenches of 1 m3. The tenor of Aluminum in the first horizon of the profile of the studied soil presents characteristic of dependence fort, have seen the relationship n effect/ landing of < 25%. the saturation of aluminum is, in 61,5% of the area, normal and in the others 38,5% of the area demand correction.

Solanum paludosum, vulgarly known as purple Jurubeba is a species of the found in the Brazilian Northeast and rich solanácea family in molecules of farmacológico interest. Among these molecules it is distinguished solasodina that it is an esteroidal alkali that if presents in nature in the glicosídica form and consists in substance cousin for the half-synthesis of adrenocorticais and glicocorticais, used hormones as contraceptive and anti-inflamatorios agents. In this work they show if the cultivated results of regeneration from explantes of leaves, fragments of hypocotyls and root in half MS increased of different regulators of growth. Most efficient that one had been gotten plants in ways of culture contends different combinations in growth regulators being the combination that contained the ácidoindlicoacetico (AIA 10-6) and benzilaminapurina (BAP 10-5M).

The lack of adequate management practices favors the reduction of the soil organic matter and fertility. The broad bean (Phaseolus lunatus) is a leguminous plant appropriate to human and animal feeding that is also cultivated to biomass production and soil incorporation as green manure. The objective of this work was to evaluate the rate of decomposition of broad bean leaves. Broad bean leaves (10 g) in nylon bags were set on the surface or 15 cm deep in the soil and leaf decomposition were evaluated every 15 days from October to December 2002, with the 2 x 5 factorial treatments, replicated three times and randomly assigned to the plots according to a completely random design. Buried leaves showed higher decomposition rate (96.7%) at day 75, while decomposition rate was higher (65.2%) at day 60 when the leaves were on the surface of the soil. Thus, as a result it is concluded that broad bean plants can be recommended for green manuring, being decomposed faster when incorporate to the soil.