A umbu-cajazeira é uma das frutíferas nativas mais exploradas na região semiárida brasileira, já que seus frutos são bastante procurados. Neste sentido, objetivou-se avaliar o tratamento de planta matriz com zinco e enraizamento de estacas de umbu-cajazeira. O experimento foi conduzido sob delineamento inteiramente casualizado, com nove tratamentos, com níveis pré-determinados pela matriz "Composto Central de Box" referente às doses de zinco (0; 5,8; 30; 34,2 e 40 mg L-1) e combinações com as doses de AIB (0; 872,35; 3000; 5127,65 e 6000 mg L-1), e quatro repetições. O tratamento de plantas matrizes com zinco não afetou o percentual de estacas brotadas, número, comprimento e diâmetro de brotações, o enraizamento e a produção de massa seca de estacas de umbu-cajazeira; O ácido indolbutírico promove o enraizamento de estacas de umbu-cajazeira, sendo que, a concentração máxima de 6000 mg L-1 de AIB proporciona os maiores percentuais de enraizamento adventício, com 43,75% de estacas enraizadas.

The cotton plant is a species cultivated in many parts of the world, with enormous economic importance. The objective of this study was to evaluate the effect of salinity levels in earthworm humus quantities function on the growth and production of cotton. The experiment was conducted in a greenhouse at the Campus IV in the State University of Paraiba, municipality of Catolé do Rocha-PB, Brazil. A completely randomized design with four replications, in a factorial 4 x 4 was used. The first factor consisted of salinity levels in irrigation water (0.8, 3, 4.5 and 6 dS m-1) and the second factor of earthworm humus amounted to: 0, 1, 2 and 3 kg/plant. At the end of the experiment, the growth characteristics: plant height, stem diameter, leaf number, unit leaf area and leaf area of the plant were evaluated. The production: number of flower buds, number of bolls per plant, seed weight per boll, number of seeds per boll, 100 seed weight, total production, fiber production and seed production were also estimated. The interaction between salinity levels and quantities of earthworm humus did not affect the growth and production of cotton. The increase in salinity levels adversely affected the cotton crop. Largest earthworm humus quantities gave an increase in cotton production.

The use of rootstocks in fruit production is extremely important, as well as reducing juvenility also enables faster production. In this context, the objective was to evaluate the effect of different rates of manure and application of organic fertilizer on the growth of guava rootstocks. The experiment was conducted in the greenhouse of the State University of Paraíba (UEPB) in municipality of Catolé do Rocha-PB, Brazil. The experimental design was completely randomized (CRD), with in factorial 5 × 2, with 6 repetitions. The treatments consisted of the combination of manure proportions: (0, 20, 40, 60 and 80% v/v) mixture to the ground (2: 1 v v -1 ) and the second factor consisted of organic fertilizer application (with and without). 30, 60, 90 and 120 days after sowing (DAS) evaluated the following variables: plant height, leaf number, stem diameter, leaf area, root length, absolute growth rate and relative plant height , stem diameter and leaf area, dry matter of root mass, shoot dry matter mass, the total dry matter and Dickson quality index. The use of cattle manure at the rate of 80% positively influenced the growth of guava rootstocks with the application of organic fertilizer.

To produce seedlings with quality is one of the factors that mostly contribute to increase the production chain of a fruit crop. The use of organic substrates in the production of seedlings becomes a way to reduce costs by using raw material available regionally. Then, the aim of this study was to evaluate the influence of rooting inducers and the contribution of organic substrates to improve the rooting of herbaceous cuttings of 'Paluma' guava. The experiment was completely randomized arranged in a 5×2 factorial design with 4 replications and 10 cuttings per plot. The factors comprised five substrates (S1-100% OC; S2-25% CRH + 75% OC; S3-50% CRH + 50% OC; S4-75% CRH + 25% OC; S5-100% CRH), where CRH: carbonized rice husk and OC: organic compost, and 2 rooting inducers (Radimaxi 20 ® and Indolbutyric Acid -IBA), with the concentration of 2000 mg L -1 . With regard to the analyzed variables, rooting, mortality, length of roots, and dry weight of shoots and roots did not fit with any regression model. However, the live rootless cuttings, callus, sprouting, leaf retention, and number of roots showed interaction between the inducers and the used substrates. The maximum rooting percentage obtained was 20%, independently of the type of inducer or used substrate; the use of Radimaxi 20 ® provides greater percentage of cuttings with callus and live rootless cuttings; the carbonized rice husk in composition S2 (25% CRH + 75% OC) is indicated to compose the rooting substrate of 'Paluma' guava cuttings; despite the satisfactory results obtained in this work, more studies are needed to clarify the rhizogenic process of guava in diversified conditions.