O preparo do solo favorece o desenvolvimento do sistema radicular e cria condições adequadas para o desenvolvimento das plantas. Todavia, o intenso uso de máquinas e implementos pode afetar a resistência do solo à penetração (RP) e a manutenção da cobertura vegetal morta na superfície do solo. O objetivo deste trabalho foi avaliar a influência dos sistemas de preparo convencional e reduzido sobre a RP e a cobertura vegetal morta em um Latossolo vermelho de textura muito argilosa, em condições de baixa umidade, além de comparar três métodos na estimativa da palhada. A RP foi avaliada por meio do uso de um penetrômetro de impacto modelo IAA/Planalsucar – Stolf na profundidade de 0,0-0,6m e a cobertura vegetal morta por meio da captura e análise de imagens. Houve diferença significativa entre os tratamentos nas profundidades de 0,15-0,20 m, 0,45-0,50 m e 0,50-0,55 m do solo. Ambos os sistemas de preparo fizeram com que o solo apresentasse de baixa a muito alta RP nas profundidades avaliadas. Verificou-se que os métodos para estimar a cobertura morta do solo não diferiram significativamente entre si e que, no momento anterior ao preparo, havia mais de 91% do solo coberto com palhada. Após as operações mecanizadas, houve maior redução de palha quando foi empregado o sistema de preparo convencional.
<p>O objetivo do trabalho foi disponibilizar informações sobre os aspectos tecnológicos e nutricionais dos frutos do quipá buscando aplicações para o mesmo na alimentação humana. O quipá é uma planta nativa da região Nordeste, seus frutos, ao contrário do figo-da-índia não é valorizado. Os frutos foram colhidos, acondicionados e conduzidos ao laboratório de Análise de Alimentos, CCTA/UFCG, Pombal-PB. Em seguida foram divididos em quatro lotes e submetidos à extração da polpa. Foram avaliadas as características físicas, físico-químicas e químicas dos frutos do quipá. Os frutos são pequenos, a casca representa mais da metade do peso do fruto e com as sementes dificultam a aceitabilidade dos frutos pelo consumidor. A polpa compõe pouco mais de 20% do peso do fruto, possui pH ácido, com baixa concentração de ácido cítrico e sólidos solúveis inferiores aos frutos de figo-da-índia e do mandacaru, comuns ao semiárido; as concentrações de vitamina C e compostos fenólicos na polpa foram consideradas significativas, o que não ocorreu com os flavonoides e antocianinas, que estavam presentes em baixas concentrações.</p><p align="center"><strong><em>Physical and chemical aspects of fruit Quipá (Tacinga inamoena)</em></strong></p><p><strong>Abstract</strong><strong>: </strong>The objective was to provide information on the technological and nutritional aspects of the fruits of Quipá in order to seek applications for the same in human nutrition. The Quipá is a plant native to the Northeast, its fruit, unlike the fig-of-India is not valued. The fruits were harvested, packaged and taken to the Food Analysis Laboratory, CCTA / UFCG, Pombal-PB. They were then divided into four batches and subjected to extraction of the pulp. the physical, physico-chemical and chemical of the fruits of Quipá were evaluated. The fruits are small, the shell is more than half the weight of the fruit and seeds hinder the acceptability of fruit by the consumer. The pulp makes up just over 20% of the fruit weight, has an acidic pH, with low concentration of citric acid soluble solids and lower the fruit of fig-of-India and mandacaru common to semiarid; concentrations of vitamin C and phenolic compounds were considered significant, which did not occur with the flavonoids and anthocyanins, which were present in low concentrations.</p>
Water stress, caused by excess or lower of water, can negatively affect leaf metabolism and seedling growth and prevent it from developing its maximum genetic potential. In this sense, it is necessary to use as that can mitigate these deleterious effects on plants at their initial phase of growth. The aim of this work was to evaluate the effect of hydrogel in the mitigation of water stress (deficit and flooding) on photosynthetic metabolism and growth characteristics of C. odorata seedlings, and also evaluate their recovery potential after the resumption of irrigation. The characteristics of photosynthetic metabolism, growth and quality of C. odorata seedlings showed a reduction caused by water fluctuations, indicating sensitivity to these conditions, although photosynthesis photochemistry was affected to a lower extent. The addition of the hydro-retainer polymer contributed little to the biochemical and photochemical indicators of photosynthesis and seedling quality, a fact that directs us to reject our hypothesis that its use promotes mitigation of damage to the photosynthetic apparatus and to the growth. Cedrela odorata is sensitive to water variations in the soil, but recovers the photosynthetic metabolism and quality of the seedlings once the stressful water condition is suspended. The application of the hydro-retainer polymer mitigated, but the seedlings recovered regardless of their presence. © 2021 Friends Science Publishers
Objective: The objective was to evaluate the physical and chemical quality of young palm cladodes produced with different sources and concentrations of organic fertilisation. Experimental Design: The experiment was conducted in a randomized block design, corresponding to five doses and three sources of organic fertilisation.
The salinity in irrigation water is one of the most important causes to decline cultivated plants yield. The H2O2 application has shown efficiency as a stimulator and activator for antioxidative defense system in plants submitted to biotic and abiotic stresses. The objective of this study was to evaluate methods for hydrogen peroxide application as a strategy to minimize the effects of saline stress on melon plants. The experiment was designed in complete randomized blocks and set in 2 × 4 factorial scheme, consisting two levels for irrigation water salinity (S1 = 0.3 and S2 = 2.0 dS m-1) and four methods for hydrogen peroxide application (15 mM), (T1 = no peroxide application, T2= imbibition of seeds, T3 = at sowing, T4 = Foliar spraying), with five repetitions. It was evaluated the following variables at 58 days after transplanting: plant height, stem diameter, number of leaves, number of flowers, shoot dry mass, root dry mass and total dry mass. The results showed that salinity affected the growth, biomass accumulation and plant quality severely, with the highest losses promoted by the electrical conductivity of 2.0 dS m-1.
O fruto de palma pode ser considerado uma fonte potencial importante de consumo e exploração no mercado da Região Nordeste do Brasil. Objetivou-se com o presente trabalho avaliar as características físico-químicas dos frutos de palma em dois estádios de maturação. Os frutos de palma foram colhidos, acondicionados em caixa de papelão e transportados do município de Ourolândia-BA cerca de 794 km para o Centro de Ciências e Tecnologia Agroalimentar, da Universidade Federal de Campina Grande, Campus Pombal, Pombal PB até o laboratório de Análise de Alimentos. Os frutos foram divididos em dois estádios de maturação: verde e verde amarelado, utilizando-se quatro repetições, com três frutos (300 g, cada). Em seguida, os frutos foram submetidos às análises físico-químicas e químicas. Os frutos verde-amarelo obtiveram os maiores teores de sólidos solúveis, acidez, vitamina C, açúcares redutores, compostos fenólicos e flavonoides. Os teores de açúcares solúveis nos frutos verde-amarelado foram menores.
Objective: In order to evaluate the quality of Tahiti acid lime fruits grafted on rootstocks under saline waters. Experimental Design: The experiment was set up using a randomized block design, corresponding to ten citrus combinations, relative to Tahiti acid lime grafted on ten genotypes, and two levels of saline water used in irrigation.
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