Welder de Araújo Rangel Lopes

Qualidade de cenouras em diferentes densidades populacionais

Foi objetivo avaliar os efeitos de diferentes espacamentos de plantio sobre a qualidade de raizes de tres cultivares de cenoura nas condicoes de Mossoro, Rio Grande do Norte. O delineamento experimental utilizado foi em blocos casualizados, em esquema fatorial 6 x 3, com tres repeticoes, sendo o primeiro fator constituido pelos espacamentos: 20 x 4, 20 x 6, 20 x 8, 15 x 4, 15 x 6 e 15 x 8 cm e o segundo, pelos cultivares: Brasilia, Alvorada e Esplanada. As caracteristicas avaliadas nas raizes de cenoura foram: comprimento da raiz, diâmetro da raiz, comprimento do xilema, diâmetro do xilema, solidos soluveis (SS), acucares totais, acidez total (AT), vitamina C, relacao SS/AT e pH. Nao houve interacao significativa entre cultivares e espacamentos de plantio em qualquer das caracteristicas avaliadas. Os espacamentos influenciaram o comprimento e diâmetro da raiz e o comprimento e diâmetro do xilema. O cultivar Alvorada sobressaiuse nos solidos soluveis, acucares soluveis totais e relacao SS/AT.

Spatial variation of physicochemical characteristics in Formosa papaya fruits

espanolLa papaya es una fruta muy apreciada en las Americas. Su calidad esta intrisecamente asociada a sus caracteristicas fisicoquimicas. En ese sentido se evaluo la calidad, despues de la colecta de papaya Formosa. De esa manera un experiment fue realizado en el Laboratorio de Tecnologia de los Alimentos de la Universidad Rural del Semiarido (UFERSA), Mossoro, RN com 20 frutos recogidos sirve el periodo de maduracion (hasta 25% de cascara amarilla), siendo seleccionados en tres porciones distintas (peducular, mediana y apical) a partir de las cuales fueron analizadas las seguientes caracteristicas: firmeza de la pulpa, acidez titulablae, pH, solidos solubles, vitamina C y indice de maduracion. El delineamento experimental utilizado fue totalmente casualizado, com 20 repeticiones de un fruto. La firmeza externa de la pulpa fue superior a la firmeza interna de los frutos. La region peduncular presento valores de acidez titulables y pH superiors a las regions pedical y medianas. Y los mayors indices de solidos solubles y indice de maturagao fueron detectados en las regions apical e mediana, demonstando que esas regiones presentan sabores mas prominentes que la region peduncular. EnglishIn order to evaluate the postharvest quality of different parts of the papaya fruit, an experiment was conducted in the Postharvest Laboratory, Department of Agrotechnology and Social Sciences, Universidade Federal Rural do Semiarido, Mossoro, RN, in September 2009. The fruits were harvested at maturity stage 2, when the fruit has 25% of the rind yellow. The experimental design was completely randomized with 20 repetitions, each repetition a fruit. The fruits were cut into three parts: stalk, median and apical, in which we analyzed the following characteristics: outer and inner pulp firmness, titratable acidity (TA), pH, soluble solids (SS), vitamin C and the SS/TA ratio. The stalk region presented higher acidity and pH than the median and apical areas. The firmness of the outer pulp iswas greater than that observed inside the fruit. The highest levels of soluble solids and SS/TA were found in the apical and median parts, demonstrating that these regions have milder flavor than the stalk region.

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.