The guajava is principally cultivated in tropical and sub-tropical regions. The Brazil is one of the principal producers worldwide besides with India, Paquistan, Mexico and Venezuela. The fruit can be used in the industrialization generating many subproducts. The objective of this paper was to evaluate the efficiency of resistance inducers alone and associated with hydrothermal treatment in the control of anthracnose of guajava. The fruits that were treated with Agro-Mos® presented minor severity in comparison to the others treatments (Crop-Set, Methyl Jasmonate and Chitosan). The Agro-Mos® was selected to be used associated with the hydrothermal treatment. The temperatures treatments, 47ºC, in any time of exposure and 50ºC in the time exposure of 3 and 6 minutes differs significantly to the others, independently of the association with the inductor.

The moringa oleifera Lam. tree, a native plant species from tropical Africa, although it has been in introduced in Brazil as an ornamental tree, it can be used for industrial and medicine purposes. The work was to evaluate the physiological quality of the jug with different reservoirs and environmental conditions for a period of six months. The study was conducted in the laboratory of plant physiology in UFERSA, where the seeds were obtained, which were stored after the harvest in three different containers: plastic bag, paper bag and glass which were stored at room temperature and cold for a period of three and six months. After 12 days of sowing, evaluations were made of the speed of germination index (IVG), height and fresh and dry matter of seedlings. The experimental design was entirely randomized in a factorial 3 x 2 x 2, and studied three containers (plastic bag, paper bag and glass), two environments (temperature and cold) and two storage periods (3 and 6 months ) with four replications. The results showed that the seeds are orthodox behavior, remaining viable for six months when stored in cold and room temperature, regardless of packaging, if they are wrapped in airtight packaging.

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 forage cactus is cultivated of extensive form as a producing species of fruits and fodder plant in many countries. The extensive culture if bases on the vegetative propagation, that is preferred, had its easiness. The propagation for seeds can come to be a useful tool for ends of genetic improvement, then, in this work forage cactus (Opuntia ficus-indica L.) seeds were submitted to different fermentation periods (0; 24; 48; 72 and 96 hours) and were dried or not, before sowing. It was evaluated the physiological quality of the seeds through the determination of the moisture content, emergence percentage and speed of seedling emergency. It was used an entirely randomized experimental design 5x2 (period of fermentation and drying). The practical one of the fermentation is efficient in the elimination of the sarcotesta in palm seeds, occurring bigger vigor in the seeds without drying and submitted the 55 hours of fermentation, as well as, the drying of the seeds, after the first periods of fermentation promotes reduction of the physiological quality, with reflected right-handers in the vigor.

This work aimed to evaluate melon cultivars under salt stress conditions. The work was carried out in green house of the Tecnology and Social Sciences Department (DTCS) of the University of the Stete of Bahia (UNEB), at Juazeiro - BA. The experimental design was totally randomized, with four replications in a factorial squeme 3 X 4 (cultivars and salt solutions) and the averages were compared by Tukey test at 5% probability. Melon seeds of the cultivars AF682, Gaúcho e Sancho were sowed in 15 L vases with previously salinizied soils with the conductivities 0,17; 2,23; 4,95 e 6,10 dS.m-1. The emergence percentage and emergence speed rate (IVE) were evaluated. Once the plants have reached blossoming, the were harvested and the fresh matter weight was obtained. After that the plants were dried at 75oC for 72 hours, for dry matter obtention. Were also messuered shoots length and number of leaves per plant. The relative chlorophyll index was obtained after 13, 20, 26 and 40 days after sowing, in three leaves per plant, with a portable chlorophyllmeter Minolta. The leaves of all plants were fotocopied and identified for leaf area (cm2) evaluation. The salt stress induced by the 6,10 dS.m-1 condictivity brought up the information that AF682 cultivar, is less tolerant to soil salinity than Gaúcho and Sancho cultivars.

Yellow passion fruit crop (Passiflora edulis f. flavicarpa Deg.) and natural insume use on agriculture are increasing in Remígio county Paraíba State, Brazil. In this direction was carried out an experiment, during July 2005 to December 2006 in randomized blocks in order to evaluate the effects of absence and presence of biofertilizers comum (bovine manure fertilizer fresh and water) and supermagro (bovine manure, water, macronutrients and micronutrients), applied to soil on liquid form, in level of 2.4 L plant-1, 30 days before and two months after transplanting, in the absence and presence of mineral fertilizer with NPK, with three repetition and six plantas per set using a factorial designs 3x2. The biofertilizers show more reliable to growth than fruit production of yellow passion fruit. Biggest production corresponded to treatments with the use of mineral fertilizer, specially in the first production. Comum and supermagro biofertilizer gave significative effects on vegetative growth of plants of yellow passion fruit plant but had no influence on fruits production.

This work aimed to estimate the phenotypic correlation coefficients and to evaluate the direct and indirect effects of these correlations (path analysis). It was studied the effect of the explanatory independent variables tiller number, stem diameter, and stem length on the main dependent variable leaf number of "Capparis flexuosa" plants during two evaluation periods in the Cariri region of Paraiba State, Brazil. There were significant differences between the evaluated periods for the studied variables. Tiller number during the dry season and stem length during the rainy season explained best the leaf number, acting respectively in a direct and inversely proportional way on the main variable, changing according to the environmental conditions during the growth period. The results allowed the conclusion that tiller number exerts great influence on leaf number in both evaluation periods.

Silk flower [Calotropis procera (Aiton) R. Br.] is a very common plant in the north-eastern Brazil, used in the animal ration in the period of food scarcity, beyond presenting phytotherapic properties and effect presented against nematoid when incorporated to the ground. The work was considered to evaluate the influence of the substrate and the temperature on the germination of seeds and the development of the seedlings. The knowledge on the germination and the more adjusted substrate can propitiate an increment in the production of seedling of silk flower. The temperature can cause changes in the germination percentage, in the speed and relative frequency of germination. In laboratory experiment using the entirely randomized delineation in array factorial 3 x 3, with 4 repetitions, whose plots had been constituted by 25 seeds. The treatments had been to the combinations of three substrate (paper towel, sand and vermiculite) with three temperatures, 25 ºC (bookshelf coated with plastic canvas), 27 ºC (laboratory environment), 30º C (chamber of controlled temperature). The analyzed variable had been the percentage of germination, VIG, SDM and height dry of the seedlings. Paper towel, under temperatures 27 and 30 °C, showed it more appropriate for the germination five days after the sowing. Sand and vermiculite under temperatures 25 and 27 ºC, showed it more appropriate for the germination and the index of speed of germination twelve days after the sowing. The dry matter of the seedlings, on sand and vermiculite was superior under temperature 30 ºC.

The purpose of this work was to verify soil respiration kinetics in two sites in the semi-arid region of Paraíba, Northeast of Brazil. The first was a Mimosa hostilis Benth (jurema preta) colonized site, and the other was a degraded area without vegetation. Soil respiration was estimated every hour during a period of 12 hrs. Absorption of the liberated soil CO2 was obtained using a KOH 0.5 N solution. The amount of absorbed CO2 was determined through titration with a HCl 0.1 N solution. Temperature was measured at the surface and 10 cm deep in the soil in both areas. It was observed that the highest level of microbial activity, at the jurema preta site, occurred from 10:00 to 12:00 o¿clock AM. The lowest level of microbial activity was observed when temperature reached 50 oC. In the degraded area, microbial activity reached a maximum at 14:00 o¿clock PM due to the reduction of soil temperature.

Objetivou nesta pesquisa testar o efeito da poda de topo no rebaixamento da copa e poda da saia na recuperação da tangerineira 'Ponkan' com 12 anos de idade, altura de 4 metros, espaçadas de 6 x 4 m e enxertadas sobre limoeiro 'Cravo'. O experimento foi conduzido na Fazenda Vito Crincoli localizada no município de Perdões, MG. O delineamento experimental utilizado foi em blocos ao acaso, em esquema fatorial 4 x 2, sendo poda do topo (sem poda, poda a 3,0; 2,5 e 2,0m) e poda da saia (sem e com a poda) com quatro repetições. A parcelaútil foi constituída de três plantas. As podas drásticas de topo prejudicaram a primeira produção, contudo a partir do segundo ano da poda, as plantas apresentaram boa recuperação. Essa afirmativa foi confirmada na terceira colheita, quando os diferentes tipos de podas do topo não se diferenciaram na produtividade, sendo que o tratamento com poda da saia foi superior ao sem poda. Os diferentes tipos de poda não prejudicaram a qualidade de frutos de tangerineira 'Ponkan' nas três safras subsequente as podas. Após o terceiro ano as plantas que sofreram podas mais severas produziram frutos com peso superiores, demonstrando a viabilidade da poda na recuperação da qualidade dos frutos.