Determinação do tempo de vácuo, momento de coleta e posicionamento de extratores de cápsulas porosas em solo arenoso
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Data
2009-06-19
Autores
Salomão, Leandro Caixeta [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho foi desenvolvido com o objetivo de monitorar a concentração dos nutrientes N, P e K, a partir de variações no posicionamento dos extratores de solução tanto na vertical como na horizontal ao longo do bulbo molhado, e o tempo de vácuo e coleta da solução do solo em relação à fertirrigação, para cultura da laranja. O experimento foi conduzido na fazenda Emu, pertencente à empresa Citrovita, localizada na cidade de Reginópolis, estado de São Paulo. Adotou-se o delineamento experimental em blocos. O arranjo dos tratamentos constitui um fatorial 4 x 4 com cinco repetições, compreendendo quatro distâncias do emissor 5, 15, 25 e 35 cm, e quatro profundidades 15, 30, 60 e 90 cm. Foram instalados 16 extratores de solução do solo por bloco, totalizando 80 extratores no projeto. O vácuo aplicado aos extratores de solução foi realizado sob diferentes momentos 0, 2, 4, 6 e 12 horas após a irrigação e dois momentos distintos de coleta após a aplicação do vácuo, 2 e 12 horas. O monitoramento da concentração dos íons no solo foi realizado por meio da retirada da solução do solo com extratores de cápsulas porosas. Durante o período de condução do experimento foi avaliado o pH, CE, nitrato, potássio e fósforo na solução do solo e umidade do solo com auxílio de tensiômetros de punção. Os resultados indicam que não há necessidade de maiores tempos para aplicação de vácuo aos extratores e coleta da solução, sendo o tempo de vácuo e coleta 4-2 suficiente para realização do procedimento de extração...
The aim of this study was to monitor the concentration of nutrients N, P and K on citrus orchard through extractors positioned vertically and horizontally along with the wet bulb in the soil. The vacuum applied to the solution extractors and the soil solution extracting time of fertigation were measured. This research was conducted at Emu farm, which belongs to Citrovita Company, located in Reginópolis city, at São Paulo state, Brazil. Was used in the experimental design blocks, the arrangement of the treatments is a 4 x 4 factorial with five replications, including four distances from the transmitter 5, 15, 25 and 35 cm, and four depths 15, 30, 60 and 90 cm. 16 extractors have been installed in the soil solution per block, totaling 80 extractors in the project. The vacuum was applied to the solution extractors at different times as 0, 2, 4, 6 and 12 hours after the irrigation occurrence. The soil solution was collected 2 and 12 hours later the vacuum had been applied. The soil ions concentration was determined extracting the soil solution through porous ceramic cup extractors.During the research period, pH, CE, soil moisture, nitrate, potassium and phosphorus content were measured in the soil solution by tensiometros de punção (tensiometric batteries). The results indicated that it is necessary to wait a long time after the irrigation to apply the vacuum and to collect the soil solution. Respectively, 4 and 2 hours to apply the vacuum and to obtain the soil solution are enough to the extraction soil solution procedure.Based on ions mobility in the soil profile to determine P and K nutrients in the soil solution is recommended to place the soil solution... (Complete abstract click electronic access below)
The aim of this study was to monitor the concentration of nutrients N, P and K on citrus orchard through extractors positioned vertically and horizontally along with the wet bulb in the soil. The vacuum applied to the solution extractors and the soil solution extracting time of fertigation were measured. This research was conducted at Emu farm, which belongs to Citrovita Company, located in Reginópolis city, at São Paulo state, Brazil. Was used in the experimental design blocks, the arrangement of the treatments is a 4 x 4 factorial with five replications, including four distances from the transmitter 5, 15, 25 and 35 cm, and four depths 15, 30, 60 and 90 cm. 16 extractors have been installed in the soil solution per block, totaling 80 extractors in the project. The vacuum was applied to the solution extractors at different times as 0, 2, 4, 6 and 12 hours after the irrigation occurrence. The soil solution was collected 2 and 12 hours later the vacuum had been applied. The soil ions concentration was determined extracting the soil solution through porous ceramic cup extractors.During the research period, pH, CE, soil moisture, nitrate, potassium and phosphorus content were measured in the soil solution by tensiometros de punção (tensiometric batteries). The results indicated that it is necessary to wait a long time after the irrigation to apply the vacuum and to collect the soil solution. Respectively, 4 and 2 hours to apply the vacuum and to obtain the soil solution are enough to the extraction soil solution procedure.Based on ions mobility in the soil profile to determine P and K nutrients in the soil solution is recommended to place the soil solution... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Solos arenosos, Fertirrigação, Extratores de solução, Solução de solos, Tempo de vácuo, Extractors solution, Soil solution, Positionig, Vacuming time collecting
Como citar
SALOMÃO, Leandro Caixeta. Determinação do tempo de vácuo, momento de coleta e posicionamento de extratores de cápsulas porosas em solo arenoso. 2009. xi, 79 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2009.