Jackson Silva Nóbrega

Produção, aspectos nutricionais e fisiológicos de alface sob adubação foliar com Spirulina platensis

Objetivou-se avaliar a influencia de concentracoes do fertilizante orgânico a base de Spirulina platensis sobre a producao, crescimento, teores de N, P, K e sodio e sobre as trocas gasosas de alface cv. Elba em condicoes de campo. Utilizou-se o delineamento de blocos ao acaso, com seis tratamentos, constituidos das concentracoes do fertilizante (0; 1,5; 3,0; 4,5; 6,0 e 7,5%) com seis repeticoes. No ponto de colheita da cultura foram avaliadas variaveis de producao e crescimento, os teores de nitrogenio, fosforo, potassio e sodio, bem como, as trocas gasosas das plantas com o medidor de gas infravermelho (IRGA). Os resultados obtidos mostraram que as concentracoes do fertilizante, nao afetaram a producao, o crescimento, os teores de nutrientes avaliados, assim como nao influenciaram as trocas gasosas das plantas. Production, mineral nutrition and physiological aspects of lettuce under foliar fertilization with Spirulina platensis Abstract : The objective of this study was to evaluate the influence of concentrations of organic fertilizer based on Spirulina platensis on yield, growth, in N, P, K and sodium contents and on gaseous changes of lettuce cv. Elba in field conditions. Use the design of randomized blocks, with six treatments consisting of different concentrations of fertilizer (0; 1.5; 3.0; 4.5; 6.0 and 7.5%) with six replications. At the harvest point were evaluated the growth and production, nitrogen, phosphorus, potassium and sodium, as well as gas exchange plant with infrared gas meter (IRGA). The results showed that the fertilizer concentrations did not affect production, growth, levels of nutrients evaluated, and did not influence the gas exchange of plants.

Biométria de frutos e sementes de Luetzelburgia auriculata (Allemão) Ducke

A Caatinga apresenta uma grande diversidade de especies vegetais , dentre elas Luetzelburgia auriculata e uma das especies predominantes no bioma, desempenhando papel fundamental para o ecossistema local. Este trabalho objetivou descrever as caracteristicas biometricas de frutos e sementes de Luetzelburgia auriculata. Para a descricao das caracteristicas da semente foram coletados 200 frutos e 200 sementes de plantas nativas do municipio de Santa Helena, Paraiba. As amostras foram encaminhadas ao Laboratorio de Nutricao Mineral de Plantas do Centro de Saude e Tecnologia Rural de Universidade Federal de Campina Grande para a realizacao das devidas afericoes biometricas. Os frutos foram analisado pelo comprimento, espessura superior, mediana e inferior; largura superior, mediana e inferior. Para as sementes, foram analisados comprimento, espessura e a largura. Verificou-se que o comprimento dos frutos variou de 50,7 a 98,2 cm, a espessura de 6,00 a 17 mm e largura variando de 12,4 a 21,8 mm. Em relacao as sementes, 46% se enquadraram na classe de comprimento com intervalo de 19,9 a 20,8 mm. A especie Luetzelburgia auriculata apresentam variabilidade nas caracteristicas biometricas de frutos e sementes Biometrics of fruit and seeds of Luetzelburgia auriculata (Allemao) Ducke Abstract: The Caatinga presents a great diversity of plant species, among them the woodpecker ( Luetzelburgia auriculata (Allemao) Ducke.) is one of the predominant species in the biome, playing a fundament al role for the local ecosystem. This work aimed to describe the biometric characteristics of fruits and seeds of Pau de Pedra. For the description of the characteristics of the Luetzelburgia auriculata (Allemao) Ducke seed, 200 fruits and 200 seeds of native plants of the municipality of Santa Helena, Paraiba state were collected for biometry and seed mass. Afterwards they were packed in plastic bags and properly identified and taken to Laboratorio de Nutricao Mineral de Plantas do Centro de Saude e Tecnologia Rural Universidade Federal de Campina Grande, where the biometric measurements were continued. The fruit was analyzed for its length, the upper, median and inferior thickness; Upper, median and lower width. The seed was analyzed for length, thickness and width. It was verified that the length of the fruits varied from 50.7 to 98.2 cm, the thickness with 6.00 to 17 mm and width ranging from 12.4 to 21.8 mm. Regarding the seeds, 46% were in the length class with a range of 19.9 to 20.8 mm. From the evaluations we conclude that the species Luetzelburgia auriculata present variability in the biometric characteristics of fruits and seeds, and the morphological description of the fruit and the seed constitutes the importance of the species recognition.