A field experiment was developed in the period of April of 2000 to May of 2002, at the Experimental Station of Jiqui pertaining to the Empresa de Pesquisa Agropecuária do Rio Grande do Norte - EMPARN, Parnamirim city, state of Rio Grande do Norte. The work had as objective to evaluate the effects of nitrogen and potassium applied through irrigation water on the vegetative behavior and productive of green dwarf coconut tree (Cocos nucifera L). The treatments had consisted of the combination through the experimental matrix of Pan Puebla III, 5 doses of N and 5 doses of K2O both oscillating of 135 the 2565g plant -1 year -1 derived of the urea and potassium chloride. The used experimental design was of blocks at random with 4 repetitions and 5 plants for plots totalizing 40 experimental units. The plantation was made in the triangular spacing of 7.5 m between plants and 7.5 m between lines. During the 5th year of culture, from April of 2001 to May of 2002 was quantified the number of fruits in the 13 harvest carried out. The referring variables to the vegetative development, height and circumference of stem, diameter of the top and leaf number, had been measured in May of 2002, in the end of the experiment. The stem circumference increased linearly with the increase of the doses of N and of quadratic form with the doses of K with the biggest value for the dose of 1350 g plants -1 year-1. The leaf number answered only the nitrogen applications. The growth in stem height had influence of N and K, however, data did not adjust to no mathematical model. The diameter of the top of the green dwarfed coconut palm did not suffer significant interference of no applied fertilizer through irrigation water. The number of fruits increased quadratically with the N and K doses. The maximum physical efficiency of the production, 154.75 fruits plants -1 year -1, it was reached with the doses of 1437 g plants -1 year -1 of N and 1553 g plants -1 year -1 of K.

The aim was to survey the floristic, structure and to characterize data of Capparis flexuosa L. in an area in the semi-arid of Paraiba State. Ninety-nine contiguous parcels of 10 m X 10 m have been established for measured standing specimens whose trunk measured ¿ 3 cm of diameter at ground level (DNS) and whose total height was ¿ 1 m. The index of diversity of Shannon-Wiener (H') and equability of Pielou (J'), density, frequency, dominance, Value of Covering (VC), Value of Importance (VI), diameter-class and height-class were calculated. It was verified that plant mean density was 2879 ind.ha-1, with 2850 individuals belonging to 22 species, 18 genera and 12 families. H' = 1.75 nats.ind-1. The value J' = 0.57 showed an ununiformity in the species distribution in the studied parcels. Capparis flexuosa was the fourth species with greatest relative density (6.04%) and relative frequence (12.43%) indicating a good distribution in the studied area; the first in relative dominance (26.03%), the third in VC (16.03%) and the fourth in VI (14.83%), suggesting that this species is well adapted to the edafoclimatic conditions of the studied area. We observed that 1.975 individuals were found between 3-6 cm of diameter and 2716 between 2.01 - 5 m height.

With the objective in determine the contribution of the clay and of the organic matter for CTC of the soils of the State of Alagoas, with base in data of the rising exploratory-recognition done by JACOMINE et al.,(1975) 265 representative samples were used of the horizons A and B of 64 profiles of the different areas of the State. The CTC of the fraction clay corrected by the organic matter is presented by area and in the general for the State: Coast CTCargila = CTCsolo - (% C x 4,4) /% clay x 100; Forest CTCargila = CTCsolo - (% C x 4,7) /% clay x 100; Rural CTCargila = CTCsolo - (% C x 5,6) /% clay x 100; Interior CTCargila = CTCsolo - (% C x 4,7) / %argila x 100; São Francisco CTCargila = CTCsolo - (% C x 3,1) /% clay x 100; General CTCargila = CTCsolo - (% C x 4,6) /% clay x 100;. It is presentedre a presentative model of equation for determination of CTC of the fraction clay (Targ) and of 1 gram of carbon (TC) (cmolc clay kg-1) for the State of Alagoas: Targ (Y) = 17,27 - 1,0976ArgB + 0,01276ArgB2 + 4,9748TB - 0,05526ArgB.TB (R2 = 0,989) and TC (Y) = 1,2189 - 0,0531ArgA + 0,0722ContA (R2 = 0,664). It's presented average, medium, minimum, maximum, standard deviation, asymmetry and curtose of the clay tenor, organic carbon, CTC and contribution of the organic carbon for area and in the general for the State, being also applied for CTC of the clay (Targ) and CTC of 1 gram of carbon (TC).

The experiment was conducted at the Soil Laboratory of the Center for Agrarian Sciences, Federal University of Alagoas to evaluate the effect of different sources of phosphorus, with different levels of humidity on the diffusive flux of phosphorus in soil samples from the State of Alagoas. Samples of four soils from different locations were used. The P sources used were the KH2PO4, Ca(H2PO4)2 and NH4H2PO4, considering two levels of humidity (40% and 80% of field capacity of soil). The test consisted of a factorial arrangement (4 x 3 x 2), corresponding, respectively, the four soils, three sources of phosphorus and two levels of moisture, with four replications in randomized blocks. As experimental units were used rings of PVC. The dose of phosphorus was 50% of maximum capacity for adsorption of phosphorus. To evaluate the diffusive flux, were used anion-exchange paper (PA). The PA was prepared using a filter paper immersed in solution of FeCl3.6H2O and then transferred to a solution of NH4OH. After dried, the leaves were cut into strips and placed in the soil samples. The estimate of the diffusion was performed by quantification of phosphorus adsorbed to the PA. In general, the diffusive flux increased with the decrease in clay content of soils and the higher water content and the source NH4H2PO4 favored greater diffusion.

An experiment was carried out at a greenhouse of Plant Science Department of the Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró-RN, in the period of May to June of 2006, with the evaluate the agronomic performance of beans mungo in function of their times of decomposition of scarlet starglory incorporated. A completely randomized desing with six treatments and five replications. The treatments consist of: T1 - 130g pot-1 of scarlet starglory in green base fresh with twenty-eight days incorporated; T2 -130g pot-1 of scarlet starglory in green base fresh with twenty one days incorporated; T3 - 130g pot-1 of scarlet starglory in green base fresh with fourteen days incorporated; T4 - 130g pot-1 of scarlet starglory in green base fresh with seven days incorporated; T5 - 130g pot-1 of scarlet starglory in green base fresh with zero days incorporated; T6 - Control (no Fertilized soil). The beans mungo cultivar planted was green gold. The evaluated traits were: plant height, dry mass and yield of grains. All the times traits were significantly affected by the amounts of scarlet starglory incorporated. Height mean value for plant height, dry mass and yield of grains were obtained in the amount of scarlet starglory incorporated of 28 days.

Objective of this study quality of lettuce cultivars under saline stress, in an experiment carried out in a greenhouse. The experiment was carried out in a completely randomized design, in scheme factorial 5 x 5, with three repetitions. The treatments were five levels of salinity of irrigation water (0.5; 1.5; 2.5; 3.5 and 4.5 dS m-1) and five lettuce cultivars (Mônica SF31, Grandes Lagos 659, Veneranda, Folha Roxa Quatro Estações e Stella). The quality characteristics evaluated in the lettuce leaves were: pH, total soluble solids (TSS), titrable total acidity (TTA) and vitamin C. The analysis of the results allowed concluding that the interaction between the factors salinity and cultivars was significant. The parameters of quality were significantly affected by salinity, however, the intensity of this effect varied with the cultivar used.

The Grass, have high relation for C / N and a fascicule root system, is an alternative for use in the system of tillage (SPD) in northeastern Brazil. This work had the objective to assess the effects of three plants and grass cover on the components of production of the corn crop in no-tillage system and accumulation of biomass of their grass. The design was randomized blocks with four replications, with each plot area of 112 m2 (5,6 x 20,0m). The treatments consisted of the corn cultivation, DKB-333-B, about three grass species (Brachiaria decumbens, Brachiaria humidicola and Tifton in the system of tillage and a witness, without vegetation. The B. decumbens provided higher income to the corn crop, producing 5708 kg ha-1, didn't differ of the witness. The use of grass as cover plants are a viable alternative to the SPD of the corn crop, adding value by producing two crops (corn and grass), and protect the soil against erosion and produce forage for ruminants during the between-season .

This work was carried out at Mossoró-RN, Brazil, to evaluate the effect of the increase of water irrigation salinity level on melon fruit quality. During two production cycles four irrigation water salinity levels were applied to the plots (S1 = 0.6, S2 = 1.9, S3 = 3.2 and S4 = 4.5 dS m-1), both continuously or being increased at different stages of development. This scheme resulted in 15 treatments arranged in an entirely randomized blocks design with four replications. Effects studied were the salinity levels, the stage of development in which they were applied, and storage time of fruits. Variables pulp fruit firmness, total soluble solids, fruit juice electrical conductivity (CEf), pH, and fruit weight loss were not affected by salinity levels, neither when used continuously nor when it was increased at different development stages. Water salinity levels did not affect fruit quality variables neither when analyzed on harvest day nor 35 days after harvest, except for CEf that, on harvest day, increased linearly with the increase in water salinity level.

Aimed to study the floristic composition of the shrub-tree layer in the areas in Caatinga baiana, Brazil. The study was made being used in each area 100 contiguous parcels of 10 x 10m. The collected material was deposited in the herbarium Jaime Coelho de Morais of UFPB and through consultations in specialized literature. They were registered in Senhor do Bonfim 1.793 individuals distributed in 52 species and 23 families. In the area of Jacobina were presented 1.961 individuals which were distributed in 62 species and 24 families. In Senhor do Bonfim, the families with larger number of species were Euphorbiaceae, Leg. Mimosoideae, Malvaceae and Rubiaceae. In Jacobina they stood out: Euphorbiaceae, Leg.Mimosoideae, Myrtaceae, Cactaceae, Leg. Caesalpinoideae, Malpighiaceae and Malvaceae. It was observed it influences her predominant of six species in the community of both areas. The analysis of similarity florística indicated that for the two areas the similarity was very low. It was verified that the studied areas presented composition varied floristic.

The agriculture soil in the semi-arid Brazilian Northeast, it finds, in many areas, degraded by the utilization of not sustainable practice. This work proposed to evaluate the effect of increasing NaCl levels in the soils under Spondias tuberosa plants colonized with arbuscular mycorrhizal fungi. Under greenhouse conditions, Spondias seeds were going placed to germinate in trays with mycorrhizal soil and in trays with soil autoclavado. The germination occurred 15 days after the planting and in the 30th cultivation day, the plants were going transferred to plastic vases with capacity for 2 L of nutritious solution with the next NaCl doses: 0, 100 and 150 mM. They were monitored the transpiration rate and stomatal conductance until the plants introduced toxicity symptoms to the Na+. After the saline stress suspending, they were evaluated the N, P, K, S, Ca, Mg, Na and Cl contents in the drought matter of the aerial part (stem + leaves) and root. It was going observed the reduction in radicular phytomass and aerial in NaCl first-level regarding the control. Stomatal conductance in plants not micorrizadas was equally reduced. In the root, it was observed significant reductions in Ca, K and Mg contents for the mycorrhizal plants and not mycorrhizal. In the leaves, the increase of NaCl dose induced a substantial reduction in the Ca, Mg and N contents and probably it was caused the reduction in the mass drought production.