Este trabalho teve como objetivo avaliar o efeito da aplicação de ácido giberélico (GA3) no pegamento, frutificação efetiva e qualidade de frutos de atemoieira 'Gefner', nas condições irrigadas do norte de Minas Gerais. O experimento foi conduzido em pomar comercial de atemoieira 'Gefner', em Matias Cardoso. O delineamento experimental foi o de blocos casualizados, com quatro repetições e cinco frutos por parcela. Os tratamentos utilizados foram diferentes doses do produto comercial Pro-Gibb®, composto por 10% de GA3, na forma de pó solúvel, sendo: 0 (testemunha), 250; 500; 750 e 1.000 mg.L-1. O produto foi aplicado diretamente nas flores de atemoieira, no momento da antese, e repetido nos frutos aos 7; 21 e 35 dias após a antese. Foram avaliados quinzenalmente pegamento, comprimento e diâmetro dos frutos. Após a colheita, as características físico-químicas avaliadas foram submetidas à análise de variância, e os efeitos das doses foram testados e ajustados em equações de regressão. A porcentagem de pegamento e frutificação efetiva dos frutos de atemoieira 'Gefner', a massa de polpa, casca e frutos, e o pH aumentaram com o incremento das doses de GA3. A aplicação de GA3 proporcionou a produção de frutos sem sementes e não influenciou no teor de sólidos solúveis dos frutos de atemoieira 'Gefner'.
Minimum limits of soil water storage should be established for the irrigation management of crops, in order to satisfactorily provide water to plants. This study aimed to define the soil water availability factor (f factor) that provides the maximum agronomic yield and maximum water-use efficiency for drip-irrigated common bean cultivars. The experiment was carried out in a randomized block design, with four replications. The treatments were arranged in split plots, with the plots consisting of f factors (0.20, 0.35, 0.50, 0.65 and 0.80) and subplots consisting of common bean cultivars (BRS Pérola and BRS Estilo). The use of f factors between 0.30 and 0.35 is recommended for common bean crops to obtain the maximum agronomic yield and maximum water-use efficiency. The BRS Estilo cultivar presents a water-use efficiency 16 % higher than the BRS Pérola.
The umbu (Spondias tuberosa Arruda) is a fruit tree adapted to the Brazilian semiarid region and constitutes an important source of income for many families in Brazil. Due to this, sustainable methods of fruit postharvest conservation should be studied. The objective of this study was to analyze the influence of cassava starch-based biofilm coatings for the postharvest conservation of umbu. The experimental design was completely randomized in a 2x5 factorial arrangement with six replicates. The two treatments, 1% cassava starch coating and no coating, were evaluated during five periods (0, 3, 6, 9, and 12 d of storage). Fresh weight loss (WL), fruit firmness (FIR), pH, total soluble solids (TSS), total titratable acidity (TA), TSS/TA ratio, external color: luminosity (L*), hue angle (H*), and chromaticity (C*) were measured. The coating of fruits with cassava starch-based biofilm improved WL, pH, and TSS. The variables TA, TSS/TA ratio, and L* were not influenced by the use or absence of the cassava starch biofilm coating. The use of 1% cassava starch to coat the fruits ensures better postharvest quality of the umbu and extends its posthavest life.
CARACTERIZAÇÃO FÍSICO-HÍDRICA DO SOLO APÓS CULTIVOS FERTIRRIGADOS COM ÁGUA RESIDUÁRIA TRATADA* FERNANDO LOPES GODINHO1; EDSON FAGNE DOS SANTOS2; SILVANIO RODRIGUES DOS SANTOS1, MARCOS KOITI KONDO1; MARFFÍSIA AMARAL RODRIGUES FERREIRA1 1Departamento de Ciências Agrárias, Universidade Estadual de Montes Claros, Rua Reinaldo Viana, 2630, Bico da Pedra, 39440-000, Janaúba, MG, Brasil, silvanio.santos@unimontes.br; marcoskondo@gmail.com; marffiziaferreira@gmail.com 2Departamento de Agronomia, Universidade Federal de Viçosa, Avenida P.H Rolfs, S/N. CEP: 36570-900, Viçosa – MG, Brasil, email: fagner-edson07@hotmail.com *Artigo proveniente da dissertação de mestrado do primeiro autor. 1 RESUMO Elevadas cargas de esgoto são destinadas aos corpos d'água no Brasil, podendo essa realidade ser mudada com o emprego de tecnologias para o uso agrícola desse resíduo. Assim, objetivou-se quantificar as mudanças no movimento e retenção de água em Latossolo Vermelho Eutrófico, após cultivo sequencial com a aplicação de água residuária sanitária tratada (ART). Para isso, foram utilizados cinco tratamentos (0= água limpa e adubação mineral; 50%; 100%; 150% e 200% da dose de ART limitada pelo elemento referência K+ nos 3 primeiros cultivos e; 0= água limpa e adubação mineral; 100%; 200%; 300% e 400% da dose de ART limitada pelo elemento referência Na+ no abacaxizeiro), no delineamento em blocos casualizados, com quatro repetições. Observou-se uma diminuição linear de 0,0972 mm h-1, 0,0997 mm h-1 e 0,0073 cm h-1 na taxa de infiltração básica, no tempo de 1,5 h e na condutividade hidráulica, respectivamente, para cada mm de efluente adicionado no solo, além de aumentar a porcentagem de sódio trocável nas profundidades avaliadas. No entanto, tais alterações não ultrapassam os limites considerados seguros pela literatura. Palavras-chave: infiltração; retenção de água; fertirrigação; esgoto sanitário. GODINHO, F. L.; SANTOS, E. F.; SANTOS, S. R.; KONDO, M. K.; FERREIRA, M. A. R. PHYSICAL-HYDRICAL CHARACTERIZATION OF THE SOIL AFTER FERTIRRIGATED CROPS WITH TREATED SANITARY WATER 2 ABSTRACT High sewage loads are still released into water sources in Brazil. This can be changed using technologies that contributes for the use of part of this wastewater in agriculture. This study aimed to evaluate possible changes in the movement and water retention in Eutrophic Red Latosol, after sequential cultivation with the application of treated sanitary wastewater (ART). Five treatments were used (0: clean water and mineral fertilization, 50%, 100%, 150% and 200% of the ART dose limited by the reference element K+ in the first 3 cultivation and 0: clean water and mineral fertilization, 100%, 200%, 300% and 400% of the ART dose, limited by the reference element Na+ in pineapple crops, in a randomized block design with four replications. A linear decrease of 0.0972 mm h-1, 0.0997 mm h-1 and 0.0073 cm h-1, respectively, was observed in the basic infiltration rate, in the time of 1.5 h, and hydraulic conductivity, for each mm effluent increased in the soil; in addition, in the percentage of exchangeable sodium at depths evaluated. However, such changes do not exceed the limits considered safe by the literature. Keywords: infiltration; water retention; fertigation; sanitary sewage; water reuse.
Reference evapotranspiration (ET0) explains the climatic effects on crop water demand. The Food and Agriculture Organization (FAO) recommends the Penman Monteith equation as a standard method for estimating ET0. However, because this equation requires a large amount of meteorological data, it has limited application. An alternative is the Hargreaves-Samani (HS) equation, which only requires air temperature data, and can be calibrated to specifc locations and periods. The present study aimed to calibrate the empirical parameters (coeffcients and exponent) of the HS equation for specifc periods of the year, as well as evaluate the behavior and calibration of this equation throughout the year in the municipality of Jaíba-MG, Brazil. The daily meteorological data from 1996 to 2011 were gathered from a weather station located in the municipality of Jaíba-MG. A general calibration was performed per semester, per season, per month, and during periods with similar climatic conditions. The calibration of the HS equation, in all of the forms studied, promoted better ET0estimations. The calibrations for specifc periods of the year only promoted slight increases in performance in relation to the general calibration, therefore they, in general, presented equal performance to each other.
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