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Lagoa Seca, Brazil

Fernandes J.D.,CCAA UEPB | Chaves L.H.G.,Federal University of Campina Grande | Dantas J.P.,CCT UEPB | Da Silva J.R.P.,CCAA UEPB
Revista Caatinga | Year: 2015

Castor produces racemes primary, secondary, tertiary, among others, whose contributions to the overall productivity differ. In this context, the aim was to evaluate the agronomic characteristics and to deter-mine the influence of the order of racemes and nutrient sources on yield of castor bean. Thus, under field con-ditions, in the municipality of Remigio, Paraíba State, an experiment with BRS Nordestina cultivar was carried out in randomized blocks design arranged in 5 (different sources of organic manure: without organic manure, compost, compost enriched with rock powders and manure and mineral complete) x 4 (orders of racemes pri-mary, secondary, tertiary and quaternary) factorial experiment, with four replications. During the experiment, plant height and insertion of racemes were evaluated, length and number of racemes, early blooming and matu-ration of racemes. After harvesting, the following variables were determined: mass of racemes, number of grains per plant, yield, weight of hundred grains, length and width of the grains and the contribution of differ-ent orders of racemes in total yield. The growth of castor bean increased with the fertilizing, especially for or-ganic compounds. The first inflorescences were emitted in castor bean plants fertilized organically. The mass of racemes, the number of grains per plant and productivity were higher in racemes of secondary and tertiary orders. The length and width of the grains was higher in primary racemes. The highest yields were obtained with the use of organic sources. © 2015, Universidade Federal Rural do Semi-Arid. All rights reserved. Source

Fernandes J.D.,CCAA UEPB | Chaves L.H.G.,Federal University of Campina Grande | Dantas J.P.,CCT UEPB | Silva J.R.P.,CCAA UEPB
Revista Ciencia Agronomica | Year: 2013

The objective of this work was to describe the periods of new-leaf formation, leaf abscission, the flowering and fuit-maturity of jatropha, Jatropha curcas L., as well as to determine some production variables of this species, in two crop cycles, fertilized with different sources of nutrient, in the municipality of Remígio, in the state of Paraíba. A randomized block design with five treatments and four replications was used. The treatments consisted of different sources of fertilization. During the months of May, 2007 to November, 2009 monthly evaluations of phenological events and the production of jatropha were made. Regardless of the treatment used, formation of new leaves was observed during the rainy season, and leaf abscission during both the colder and dryer months. Flowering in the first crop cycle began with the end of the rainy season, when using the organic compound II (F3), whereas in the second cycle, the first instances of inflorescence were observed at the start of the rainy season in those plants fertilized with the organic compound I (F2) and manure (F5). In all treatments the time verified between the instances of inflorescence and the physiological maturity of the fruit was approximately 120 days. For the first harvest, the sources of fertilizer did not produce any differences for any of the production variables, however, for the second harvest, besides there being an increase in production, the organic compound I (F2) and manure (F5) were those which gave the best results. Source

Monteiro Filho A.F.,Federal University of Campina Grande | Pereira G.L.,CCAA UEPB | Azevedo M.R.Q.A.,CCAA UEPB | Fernandes J.D.,CCAA UEPB | de Azevedo C.A.V.,Federal University of Campina Grande
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The study aimed to evaluate the cultivation of lettuce varieties in floating type hydroponic system with nutrient solutions optimized by the SOLVER tool of the Microsoft Office Excel. The experiment was conducted at the Center of Environmental and Agricultural Sciences Center of the Paraíba State University, adopting an entirely randomized experimental design arranged in factorial scheme 4 x 3, with three repetitions. The factors were 4 nutritient solutions (S1 = 100% mineral solution; S2 = 90% mineral solution + 10% organic solution; S3 = 84% mineral solution + 16% organic solution and S4 = 78% mineral solution + 22% organic solution) and 3 lettuce varieties (C1 -Crespa; C2-Monteiga and C3-Ruby). The plant height, stem diameter, number of leaves, the length of the root, fresh matter weight and the dry matter weight of the lettuce were evaluated. The organominerals solutions promoted a greater resistance to variation of the pH and replaced partially the mineral solution. The best biometric and production means were observed for the Crespa and Monteiga varieties and for the mineral solution, mineral solution + 10% of organic solution and mineral solution + 22% of organic solution. Source

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