Saline stress is a frequent phenomenon in the arid and semi-arid regions of the globe, affecting the agricultural production of these regions, and it is necessary to use strategies that minimize the impacts of saline stress under agriculture. This requires the incorporation of species, variety and genotypes tolerant to increase agricultural production in those regions. This study aimed to evaluate germination and initial growth of cowpea genotypes under salt stress. The experimental design was completely randomized in 19 x 3 factorial scheme, composed of nineteen cowpea cultivars and three osmotic potentials, with four replicates of 50 seeds each. The germination test lasted for eight days, when the seeds were evaluated for germination percentage, germination speed index, length of shoot and root, accumulation of dry mass of shoot and root. The increase in salinity affected germination and initial growth of the cowpea genotypes. The genotypes 6 -MNCO2-689F-2-8, 10 -MNCO2-675F-4-10, 12 -MNCO3-737F-5-9, 16 -MNCO2-677F-2, 18 -BRS-Pajeú and 19 -Paulistinha exhibited higher tolerance to salt stress in the stage of germination and initial growth. The genotypes 11 -MNCO2-675F-9-5, 13 -BRS-Tumucumaque, 15 -MNCO3-736F-7 and 17 -BR17-Gurgueia were more susceptible to the effects of salt stress in the stage of germination and initial growth.

O zoneamento agroclimático é uma ferramenta importante na determinação do potencial agrícola de uma região, podendo auxiliar no planejamento das atividades agrícolas. Assim, objetivou-se determinar o potencial agroclimático para o cultivo da mangueira (Mangifera indica L.) visando dar informações para a implantação da cultura no município de Barbalha-CE. Para isso, utilizou-se uma série histórica de 44 anos de dados meteorológicos, referente ao período de 1973 a 2016 de precipitação pluviométrica e temperatura média do ar para o cálculo do balanço hídrico climatológico e do índice de umidade. Na determinação do potencial agroclimático, utilizaram-se as faixas do índice de umidade anual (Iu) e da temperatura do mês mais quente (Tq). Os parâmetros climáticos médios foram: precipitação pluviométrica 1053,9 mm ano-1 , índice de umidade-10,8% e temperatura do ar referente ao mês mais quente 27,4 ºC. O município de Barbalha-CE possui potencial agroclimático pleno para o cultivo da mangueira desde que complementada com irrigação. O município de Barbalha-CE possui potencial agroclimático pleno para o cultivo da mangueira com a necessidade de irrigação complementar principalmente no segundo semestre do ano. Os resultados alcançados com este estudo proporcionam subsídios para a implantação da cultura pelos produtores do município. Palavras-chave: índices climáticos, aptidão hídrica e térmica, Mangifera indica L.

Currently there is a great need for reuse of water in agricultural activity, aiming at reducing environmental impacts and production costs. The objective of this study was to evaluate the fruit production of hybrid Satrapo bell pepper, under fertilization with yellow water and cassava wastewater. The experiment was conducted in a greenhouse located at Campina Grande city, PB. The experimental design was completely randomized, with eight treatments and five replications, totaling 40 experimental plots. The treatments were characterized by fertilization with cattle manure (EB); NPK; human urine (HU); cassava wastewater (M); cassava wastewater and human urine (UH+M); the double volume of human urine (2xUH); the double volume of cassava wastewater (2xM); and the double volume of human urine and cassava wastewater (2xUH+M). At 60 day after transplanting (DAT) were evaluated the diameter, thickness of mesocarp, fresh and dry phytomass and number of lobes of yellow bell pepper fruits.According to the results, there were significant differences in the variables analyzed due to the treatments applied. The treatment corresponding to 2xM provided the highest results for length, diameter, thickness of the mesocarp, fresh and dry phytomass of the bell pepper fruits. On the contrary, 2xUH was the treatment that provided the lowest values for these variables and provided the highest number of lobes.

The objective of the present study was to evaluate the effect of nitrogen doses applied via fertigation and associated with different types of crop establishment fertilization on growth and biomass of radish. The experiment was conducted in a greenhouse of the Academic Unit of Agricultural Engineering, Federal University of Campina Grande, from April to May 2014. Treatments consisted of five doses of nitrogen fertilizer applied by fertigation (0, 0.7, 1.4, 2.1 and 2.8g per pot) and three types of crop establishment fertilization (humus 2:2; NPK and control), arranged in a 5 x 3 factor design with four repetitions. The 15 treatments were arranged in 60 plots. The nitrogen source used in the study was urea, divided in three applications: the first application was carried out eight days after transplanting, the second, on day 15, and the third, on day 22. The crop establishment fertilization significantly influenced the growth variables and plant mass of the radish on day 35 after transplanting. The highest values of the variables (number of leaves, plant height, bulb diameter, leaf area, fresh mass of the aerial part, dry mass of the aerial part and root/aerial part were observed in the treatment with humus on day 35 after transplanting. The dose of 2.8g nitrogen per pot corresponding to 6.22g of urea per plant provided the highest yield for the variable number of leafs, leaf area and root length on day 35 after transplanting.

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