Rafaella Rayane Macedo de Lucena

Maturação de sementes de abobrinha menina brasileira

The objective of this study was to determine the physiological maturity of buttennut squash seeds, cv. Menina Brasileira, in relation to fruit age. Seeds from fruits collected at 20, 30, 40, 50 and 60 days after anthesis (DAA) were used. The squash plants were grown on the central campus of the Universidade Federal Rural do Semiarido, Mossoro, RN - Brazil, from December 2007 to March 2008. The harvested fruits were rested prior to seed extraction and determination of the water content and dry weight. The physiological quality of the seeds was evaluated from tests of germination, germination first count, emergence speed index and accelerated aging. The seed water content decreased from 76% to 49% during the study period. The seed physiological quality increased with fruit age, reaching physiological maturity at about 60 DAA. The fruits may be harvested between 50 and 60 DAA.

Crescimento e produtividade do coentro e rabanete em função da época de estabelecimento do consórcio

Objetivou-se com este trabalho avaliar o rendimento de coentro (Coriandrum sativum L.) e rabanete (Raphanus sativus L.) em funcao da epoca de estabelecimento do consorcio. O delineamento experimental utilizado foi o de blocos casualizados completos, com sete tratamentos e quatro repeticoes. Os tratamentos analisados corresponderam a monocultura do coentro e as consorciacoes deste com o rabanete aos 0, 7 e 14 dias apos a semeadura do coentro e as monoculturas do rabanete nas mesmas epocas de estabelecimento dos cultivos consorciados. As cultivares de coentro e rabanete foram respectivamente, Verdao e Crimson Gigante. Avaliaram-se a altura de plantas, massa fresca e seca da parte aerea e produtividade do coentro, e, altura de planta, massa seca da parte aerea, massa fresca e produtividade de raiz comercial e nao comercial, massa seca de raiz comercial de rabanete e o indice de uso eficiente da area. Com base na produtividade e no indice de uso eficiente da area, pode-se concluir que o cultivo consorciado do coentro com rabanete e viavel, sendo que as melhores respostas foram obtidas nos consorcios estabelecido aos 7 e 14 DAS do coentro.

Crescimento do tomateiro cultivado em solo coberto com polipropileno preto

Realizou-se um experimento para avaliar o crescimento e particao de assimilados de plantas de tomate cultivadas sob cobertura ou nao do solo com polipropileno preto. O delineamento experimental foi em blocos casualizados completos, com parcelas subdivididas e quatro repeticoes. Nas parcelas, os tratamentos se constituiram de dois sistemas de cultivo (com e sem cobertura do solo polipropileno preto, TNT) e nas subparcelas, as epocas de amostragem das plantas: 14; 28; 42; 56; 70; 84; 98 e 112 dias apos o transplantio, DAT. Foram avaliados: acumulo de massa seca nas folhas (MSF), ramos (MSR), inflorescencias (MSI), frutos (MSFR) e total (MST), area foliar (AF), razao de area foliar (RAF), taxa assimilatoria liquida (TAL), taxa de crescimento absoluto (TCA) e taxa de crescimento relativo (TCR). A cobertura de solo nao influenciou o MSF, MSR, MSI, MSFR e MST como tambem a AF, RAF, TAL, TCA e TCR. Os frutos se comportaram como dreno preferencial da planta, chegando ao final do ciclo com 47,77% do total da massa seca acumulada. A AF, RAF e TCA atingiram valores maximos aos 83; 27 e 73 DAT, com medias de 75.835 cm2 planta-1, 201,5 cm2 g-1 e 14,87 g planta-1 dia-1, respectivamente, enquanto a TCR e a TAL decresceram durante todo o periodo de avaliacao.

ANÁLISE QUALITATIVA DE CULTIVARES DE ALHO SEMI-NOBRE VERNALIZADO NA MESORREGIÃO OESTE POTIGUAR

Garlic is a vegetable that has economic and social relevance in Brazil. Rio Grande do Norte is among the consumer states, however, despite having regions with favorable conditions for growing garlic, it depends on imports of this product to meet its demand. The introduction of cultivars that have high yield and quality, and the adjustments in vernalization technology, which is a key issue for adaptation of new cultivars, are mechanisms that can contribute to garlic revitalization in areas previously producing this vegetable. Therefore, the objective of this work was to assess the quality characteristics of semi-noble garlic cultivars subjected to different bulb-seed pre-planting vernalization periods in two counties of the Western Mesoregion of Rio Grande do Norte State (RN), Brazil. Two experiments were simultaneously conducted in Barauna RN and Governador Dix-sept Rosado RN, from April to November, 2012. A complete randomized block experimental design was used with four replications. The treatments were arranged in split-plot design, with the plots consisted of cultivars (Gigante-do-Nucleo and BRS-Hozan) and subplots consisted of bulb-seed preplanting vernalization (4±1°C) periods (0, 10, 20 and 30 days). The evaluations consisted of bulb diameter, pH, titratable acidity, soluble solids, total soluble sugars, reducing sugars, pungency, total solids and industrial index. The use of 10-day bulb-seed pre-planting vernalization increased the semi-noble garlic quality produced in Barauna and Governador Dix-sept Rosado. The cultivars Gigante-do-Nucleo and BRS-Hozan presented good prospects for industrialization, with good characteristics of flavor and aroma.