The study aimed to: assess the effects of plant densities in the behavior of genotypes of maize; Select the genotypes of greater adjustment and grain yield and better density of planting in the municipality of Rio Largo-AL. It was evaluated the genotypes: UFAL-1, UFAL-4, UFAL-5, UFAL-7, Sertanejo, Cruzeta and AL-30, and the densities: 55,555, 66,666, 77,777 and 88,888 plants.ha-1. Used randomized block design scheme in a split plot with three replicates. The plots (4 rows 18mx0, 9m) was formed by genotypes and the subplots (4.5 mx0 ranks, 9m) by densities, with one plant per pit. It was determined the variables: plant height and insertion of the 1st spike, the stem diameter, ear size and number of rows of grain in ear, index of ears and yield. The density of planting of 55,555 plants.ha-1 improved performance in the variables, plant height, diameter of the stem, size of the ear, index of spike and grain yield in genotypes; Genotypes AL-30 and UFAL-4 outperformed the others in grain yield; Low correlation of the variables studied with the yield; Lack of water during the flowering to maturity of the grains meant that the genotypes expressing its full potential.

The current work had the objective to evaluate the effect of Hydropriming about the germination and emergence of seeds of cucumber, ordering improve the velocity and informing of this. The tests was conduced in the laboratory of Analysis of Seeds and Didactic Garden of Department of Plant Sciences of Universidade Federal Rural do Semi-Árido - UFERSA, in the period of September to October at 2009. For this, it was utilized seeds of cucumber cultivate Aodai, with four replications for next treatment (demonstration, Hydropriming and Hydropriming + drying). The seeds was hydroconditioned in towel-paper, in 20 ºC, until culminate 42,8% of humidity. Later were drying in ambient temperature of laboratory (28-30 ºC) and 45-55% of relative humidity, until hit moisture of 7,3%. The seeds was evaluated for tests of germination, velocity index of germination, first count of germination, aerial part length of seedling and aerial part dry matter mass. The statistical analysis was effectuated separately for next feature evaluated, determining the effects of treatments in completely randomized design, being the comparison of means out Tukey test in level of 1% of probability. Though the Hydropriming with or out drying promote benefit effects about the emergence of seedlings, aspect relationship of establish of stand, the technical needs of improvement for specie, given in necessity of adaptation of methodology of priming.

Knowledge of the speed of infiltration of water into the soil is of fundamental importance to define the methods of soil conservation, planning and design of irrigation systems and drainage. In order to study the speed of infiltration of water into a OxiLatossoil, before the system management tillage applying different empirical models, this work was conducted Centro de Ciências Agrárias, at the Federal University of Alagoas (CECA - UFAL), in order to evaluate the behavior of the equations of Kostiakov, Kostiakov-Lewis and Horton which Were used to estimate the Water infiltration rate in studied soil by using simple the soil under study, using a simple ring to evaluate the infiltration of water in the field. It was then that the system on the equation that more fit the model of the simple ring infiltrometer was to Kostiakov followed the model of Horton.

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.

The effect of plant growth-promoting bacteria (PGPB) on spore germination of arbuscular mycorrizal fungi (AMF) and the co-inoculation of these organisms on aclimatization of micropropagated pineapple cv. Pérolaseedlings were evaluated. The germination study was performed in a completely randomized design (CRD), factorial of 3 (G. albida, G. etunicatum, S. heterogama) × 4 (C210, RAB9, ENF10 and control) with five replicates, in plate with water-agar, where the bacteria and spores were inoculated and evaluated after 21 and 28 days. The co-inoculation study was performed in a CRD, factorial of 5 (G. albida, G. etunicatum, S. heterogama, mixture ofAMF and control) × 5 (C210, RAB9, ENF10, mixture of PGPB and control) and six replicates. At the 21th day RAB9 stimulated germination of G. albida in relation to the others PGPB; ENF10 stimulated the germination of G. etunicatum in relation to absence of bacteria, where the spores did not germinate; differences were not observed for S. heterogama. At the 28th day C210 inhibited the germination of G. albida. In both periods, G. albida showed higher germination rate. In absence of PGPB,G. albida improved growth more than G. etunicatum. The effect of G. albida on seedlings can be inhibited by C210 and by the bacterial mixture. It was confirmed that AMF germination can be stimulated or inhibited in presence of PGPB while the mycorrhizal symbiosis can be inhibited. In general co-inoculation of AMF and PGPB did not improve growth of pineapple cv. Pérola during the aclimatization period until the 90th day.

It had the aim to evaluate chemical composition functioning of two systems, three planting densities and four height of plant. It had been used randomized blocks an sub-divided parcels of factoring 2x3x4 with 5 repetition being two soil management (with/without camalhao) three densities of planting (6666; 3333 and 2500 plants/ha) and sub-parcels four planting cutting (5, 15, 30 and 45 cm). Studied variable were: crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), non-fibrous carbohydrates e total, (NFC) (CT). Management system and others did not influence (P>0.05), CP mean with medium value of 11%, NDF and ADF were affected (P<0.01) only by soil management and cutting height. System linking and other had influenced (P<0.01) CNF mean. Soil management system as planting density did not influence (P>0.05). CHOT mean with medium value of 78.0%.

The interrill erosion can be the most harmful form water erosion, due it drags of the superficial layer of the soil, where it essential elements to the crop development. This work had the objective of evaluating the soil losses for different slopes and doses of residue of sugar-cane straw. The experiment was led at Soil Conservation laboratory of UFRPE, it was constituted in the evaluation of the water erosion obtained under simulate rains in experimental portions (1,0 m x 0,5 m x 0,1 m). It was observed that there was difference for the applied doses of 0,4 and 0,6 kg m-2 of soil cover, in relation to the bare soil, so much for the soil losses as for it rates them of soil detachment, demonstrating the effectiveness of the cover of the soil in the reduction of the erosion rates. With relationship to the applied slopes, therewas an increase of the soil losses and of the rates of soil detachment, with the elevation of the slopes among all the cover doses. The residues in the surface of the soil reduce the rates of soil detachment and they increase the resistance to the surface water, provoking decrease of the Numbers of Reynolds and of Froude, evidencing the interrill erosion. The laminar slow regime of surface water to attest the interrill erosion.

The evaluation of the effect of seed has been fundamental tool in the program of quality control, and the accelerated aging test, an important part of that process. Some authors report that the germination and vigor are associated with seed size and facing the lack of consensus for the use of this test methodology and the relationship of seed size on the physiological quality, this work aimed to adapt the existing methodology as the temperature and period of conditioning on the performance of two sizes of seed cotton. The seeds were classified into two meshes of sieves, and then subjected to tests of water content, germination and electrical conductivity. The experimental design was completely randomized, analyzed statistically in a factorial threefold. Seeds of different sizes, showed no difference in percentage of germination. Seeds subjected to 40 º C for 42h of conditioning showed better percentage of germination.

The objective of this work was to evaluate the influence of crescents phosphorus levels in two hybrids of forage sorghum cultivated on "Zona da Mata" region, State of Alagoas. The treatments were two hybrids of forage sorghum: BRS304 e BRS310, and four phosphorus levels: 0, 25, 50 e 75 kg ha-1. The statistical design was the complete randomized block with four replications in a split plot scheme. Each experimental plot was constuited for five row of 4.5 m, spaced of 0.70 m. The soil of experimental area received lime to increase basis saturation to 60%. During the sowing, all experimental area received 100 and 120 kg ha-1 of N and K, respectively. The plants were collected 40, 50, 60 e 70 days after emergence. The mass collected was separaeted in leaves photosynthetic active and remaining of the plant. When the grains were on the "farináceo duro" stage, the yield was evaluated in 1.4 m2 on plots center. The phosphoted fertilization increases linearly the sorghum production until 75 kg ha-1 level of P. The phosphorus provides better grain participation on total dry matter of sorghum plants.