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Junior J.A.S.,Instituto Nacional do Semiarido INSA MCTI | Gheyi H.R.,Federal University of Reconcavo da Bahia | Dias N.S.,Federal Rural University of the Semiarid Region | Araujo D.L.,Federal University of Campina Grande | Filho D.H.G.,Federal University of Campina Grande
Revista Ciencia Agronomica | Year: 2014

The use of wastewater in the preparation of the nutrient solution in semi-hydroponic cultivation both increases the supply of water in regions where it is scarce and recycles the nutrients it contains, making them available to plants. Taking these aspects into consideration, the aim of this study was to analyse the growth and development of sunflower plants for ornamental purposes, when grown under a semi-hydroponic system, using wastewater in the preparation of nutrient solutions based on NPK at increasing nutrient concentrations (55, 70, 85 and 100%), and in different growth substrates (coconut fibre, washed sand and sugarcane bagasse). The treatments were arranged in a completely randomised design and analysed in a 4 × 3 factorial scheme with three replications, giving a total of 36 experimental units. It was found that even with the concentration of NPK in the nutrient solution reduced to 55%, the growth of sunflower plants for ornamental purposes remains within commercial standards, provided that wastewater is used in the preparation of the nutrient solution, and coconut fibre or washed sand as the growth substrate. Source


Pereira T.N.S.,State University of Norte Fluminense | Neto M.F.,State University of Norte Fluminense | Damasceno P.C.,Federal Rural University of Rio de Janeiro | Da Costa Rabelo F.,Instituto Nacional do Semiarido INSA MCTI | Pereira M.G.,State University of Norte Fluminense
Cytologia | Year: 2014

The objective of this study was to evaluate the genetic relationship between five Vasconcellea species (V. cauliflora, V. goudotiana, V. quercifolia, V. monoica, and V. cundinamarcensis) and Carica papaya based on their chromosome features. To do that, five metaphase plates showing well spread and condensed chromosomes were used for the chromosome measurements: the absolute chromosome length (CL) and the lengths of the long (LA) and short (SA) arms. Further, we estimated the ratio between the arms (r), the centromeric index (CI), and the total length of haploid set (TLH). The Total Form index (TF%), the Rec, and the SYi were estimated for symmetry/ asymmetry of the karyotype. Most species show karyotype formulae of nine pairs of metacentric chromosomes (9m) except for V. goudotiana, which has five pairs of metacentric chromosomes and four pairs of sub-metacentric chromosomes (5m+4sm). V. goudotiana had the longest total length of haploid set, whereas V. quercifolia showed the shortest one. Based on the estimates of symmetry/ asymmetry indexes, four species have symmetric karyotype; moreover, V. goudotiana has asymmetric karyotype because it showed the lowest values of Syi and TF% index. The similarity matrix of five parameters for the six species was employed and based on the dendogram four clusters were formed; the first included C. papaya and V. cundinamarcensis, the second cluster was formed by V. monoica and V. cauliflora, the third by V. quercifolia and fourth by V. goudotiana. So, based on chromosome features V. cundinamarcensis, V. cauliflora, and V. monoica are closer to papaya than V. goudotiana. Source


Azevedo W.S.L.,Federal University of Paraiba | Santos Junior J.A.,University of Pernambuco | de Araujo A.E.,Federal University of Paraiba | Perez-Marin A.M.,Instituto Nacional do Semiarido INSA MCTI | Medeiros S.S.,Instituto Nacional do Semiarido INSA MCTI
Revista Ciencia Agronomica | Year: 2015

The reduction on crop production observed in semiarid conditions is closely linked to soils degradation in their physical, microbiological and fertility aspects. Based on this premise, the effects of different types of organic fertilizers associated to the use of mulching in the production of cowpea grown in Paraíba state, Brazil, under semiarid conditions, was studied. The research was conducted under field conditions in the municipality of Casserengue, PB, from April to July 2010. The statistical design in randomized block design with five treatments and five replicates was used, totaling 25 experimental units. Treatments consisted on application of cattle manure or biofertilizer on presence or absence of mulch, plus a control treatment, without fertilization or mulching. It was found that cowpea plants grown under the interaction between manure and mulch had higher phytomass and grain production. Source


Borburema J.B.,Instituto Nacional do Semiarido INSA MCTI | Borburema J.B.,Federal University of Campina Grande | Medeiros G.R.,Instituto Nacional do Semiarido INSA MCTI | Medeiros G.R.,Federal University of Campina Grande | And 10 more authors.
Journal of Food, Agriculture and Environment | Year: 2013

This study was conducted with the purpose of evaluating the effect of food supplementation on the production and physical and chemical composition of milk from cows of the breed Curraleiro Pé duro in a grazing system in the semiarid area of Paraíba. Ten cows of the breed Curraleiro Pé duro, at the second lactation month, arranged in a double 5 x 5 Latin square design, were used in the experiment. Besides food supplementation, protein and mineral supplement and water were fed ad libitum to the cows. Cubic profile was observed (P<0.05) for acidity, density and non-fat solids in relation to food supplement concentrate. As for cryoscopy, quadratic effect (P<0.05) was observed. The supplement concentrate affected the physical and chemical composition, but did not change the amount of milk produced by Curraleiro Pé duro cows in the semiarid area of Paraíba. Source

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