Manejo da água e nutrientes para o pepino em ambiente protegido sob fertirrigação

Blanco, Flávio Favaro; Folegatti, Marcos Vinícius

doi:10.1590/s1415-43662002000200012

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Ammonium sulphate, calcium nitrate, potassium nitrate, potassium chloride, phosphoric acid and magnesium sulphate fertilizers were applied through the irrigation system in all irrigations. Details about the fertigation management are presented elsewhere (Blanco & Folegatti, 2002). S1 water received only the fertilizers, while for S2 and S3, calcium chloride, magnesium sulphate and sodium chloride were added in order to obtain the desired salinity.…”

Section: Methodsmentioning

confidence: 99%

Evapotranspiration and crop coefficient of cucumber in greenhouse

Blanco

Folegatti

2003

Rev. bras. eng. agríc. ambient.

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The evapotranspiration (ETc) and crop coefficient (Kc) of cucumber in a greenhouse were determined during the winter-spring season in Piracicaba, SP, Brazil. Crop was irrigated with water of three different levels of salinity: S1 = 1.5, S2 = 3.1 and S3 = 5.2 dS m-1. Electrical conductivity of S1 was obtained only by addition of fertilizers, as fertigation was used, and the S2 and S3 levels in addition to fertilizers received magnesium sulphate, calcium chloride and sodium chloride. Cucumber seedlings, cv. Hokushin, were grafted on squash, transplanted on beds in double rows and directed vertically with a single stem. Irrigation was performed when soil matric potential reached -30 kPa, which was determined by the mean matric potential at 0.15 and 0.30 m depths, and the depth of irrigation was calculated from a reduced-evaporation pan. A randomized block design was adopted with three replications. The ETc and Kc were found to reduce linearly by the salinity of the irrigation water with reduction in ETc of 4.6% for unit increase of salinity. Due to the reduced evapotranspiration in saline treatments, deep percolation was increased by saline water and corresponded to 4, 7 and 17% of the total applied water in S1, S2 and S3, respectively. Measured Kc values for S1 were very close to the estimated values thus the combined use of tensiometers and evaporation pan was found to be adequate for irrigation management in greenhouse.

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Section: Methodsmentioning

confidence: 99%

Evapotranspiration and crop coefficient of cucumber in greenhouse

Blanco

Folegatti

2003

Rev. bras. eng. agríc. ambient.

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“…Water and nutrient availability should be close to the optimal for crop development and yield (Blanco & Folegatti, 2002). Excessive application of fertilizers causes physiological disorders, such as drops in fruit yield and quality, nutritional imbalance and increases in osmotic pressure (Epstein & Bloom, 2006).…”

Section: Researchmentioning

confidence: 99%

Improving sweet pepper yield and quality by means of fertigation management

et al. 2017

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Fertigation can be managed using fixed fertilizer doses or by assessing the ionic concentration of soil solution throughout the growing period. This work studied how different fertigation management systems affected sweet pepper yield and quality. The experiment was carried out in greenhouse, in pots. Fertigation was managed according to the crop uptake rate (M 1 ) or by monitoring either the electrical conductivity (M 2 ) or the N and K concentration (M 3 ) in the soil solution. Fertigation management was combined with six N and K doses (0, 50, 100, 150, 200 and 300% of the recommended dose for sweet pepper in the region), in complete blocks at random, with four replications, and treatments in 3x6 factorial. Dry matter accumulation, yield and fruit grading were evaluated. Fertigation managed by means of monitoring the soil solution improved the vegetative growth in up to 25% and increased yield in up to 20% when compared to management according to the uptake rate. Highest fruit yields in M 1 , M 2 and M 3 were achieved with N and K levels corresponding to 127.6% (1.33 kg/plant), 222.5% (1.60 kg/plant) and 215% (1.48 kg/plant), respectively. N and K can be supplied successfully to sweet peppers using electrical conductivity or concentration of ions in the soil solution to manage fertigation. These management systems resulted in high quality fruits and up to 47% increase in N and K use efficiency. N and K concentration equivalent to 200% of the recommended for growing sweet pepper in hydroponics should be taken as reference.Keywords: Capsicum annuum, ionic concentration, porous cup extractors, nitrogen, potassium, electrical conductivity. RESUMOAumento da produtividade e qualidade do pimentão pelo manejo da fertirrigação O manejo da fertirrigação pode ser realizado com doses fixas de fertilizantes ou por meio da avaliação da concentração iônica na solução do solo ao longo do período de cultivo. Objetivou-se avaliar diferentes formas de manejo de fertirrigação na cultura do pimentão, com ênfase para a produção e qualidade de frutos. O experimento foi conduzido em casa de vegetação e as plantas foram cultivadas em vasos. Testaram-se três formas de manejo de fertirrigação (M 1 ) realizado de acordo com a marcha de absorção da cultura, (M 2 ) por meio do monitoramento da condutividade elétrica da solução do solo e (M 3 ) por meio do monitoramento da concentração de N e K. Utilizaram-se seis doses de N e K (0, 50, 100, 150, 200 e 300% da dose recomendada para a cultura) em delineamento experimental de blocos casualizados, com esquema fatorial 3x6 e quatro repetições. Avaliou-se o acúmulo de matéria seca, produção e a classificação de frutos. As formas de manejo de fertirrigação com monitoramento da solução do solo (M 2 e M 3 ) proporcionam desenvolvimento vegetativo até 25% maior, e acréscimo de produtividade de até 20% quando comparados com o manejo que segue a marcha de absorção (M 1 ). Os maiores rendimentos de frutos nos manejos M 1 , M 2 e M 3 foram obtidos para os níveis de N e K correspondentes a 127,6...

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“…Esta concentração deve ser suficiente para proporcionar a absorção dos nutrientes nas quantidades requeridas pelas plantas, sem causar o acúmulo de fertilizantes no solo, o que poderia resultar em salinização e, consequentemente, na redução da produtividade. Assim, é necessário que se conheça a quantidade de água a ser aplicada em cada irrigação, a qual pode ser determinada pelo uso de tensiômetros ou estimada a partir da lâmina de água evaporada do tanque Classe A (BLANCO; FOLEGATTI, 2002).…”

Section: Introductionunclassified

Rendimento da cultura da cebola submetida a níveis de água e nitrogênio por gotejamento

et al. 2014

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ResumoO objetivo deste trabalho foi avaliar os efeitos de níveis de água e nitrogênio (N), fornecidos por gotejamento, no rendimento e na eficiência no uso da água da cultura da cebola (Allium cepa L.). O experimento foi realizado na área experimental do DEG/UFLA no delineamento em blocos casualizados, em esquema fatorial 4 x 4, com três repetições. Os tratamentos constituíram de quatro lâminas de irrigação, baseadas na evaporação do tanque Classe A (50, 100, 150 e 200% da ECA), e quatro doses de N (0, 60, 120 e 180 kg ha -1 ) fornecidas via água de irrigação (fertirrigação). Concluiu-se que maiores produtividades (total de bulbos e de bulbos comerciais) e maior massa média de bulbos comerciais foram obtidas com a aplicação da lâmina de irrigação de 512,7 mm (100% da ECA) e com a dose de 180 kg ha -1 de N. A eficiência no uso da água reduziu, linearmente, em virtude do acréscimo das lâminas de irrigação e do decréscimo das doses de N. Palavras-chave: Allium cepa L., irrigação localizada, adubação nitrogenada, nutrição mineral AbstractThe aim this work was evaluate the effects of water and nitrogen (N) levels, supplied by drip system, on yield and water use efficiency of onion crop (Allium cepa L.). The experiment was carried at the experimental area of DEG/UFLA, in a randomized block statistical design was used, in a factorial scheme 4 x 4, with three replicates. Four irrigation depths based on Class A evaporation tanks (50, 100, 150 and 200%) and four N doses (0, 60, 120 and 180 kg ha -1 ) were supplied through irrigation water (fertigation). It can be concluded that higher yields (total bulbs and of marketable bulbs) and higher average marketable bulbs mass were obtained with the irrigation depth of 512.7 mm (100% Class A) and 180 kg ha -1 of N. Water use efficiency decreased linearly as irrigation depths increased and N rate decreased.

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Manejo da água e nutrientes para o pepino em ambiente protegido sob fertirrigação

Cited by 7 publications

References 2 publications

Evapotranspiration and crop coefficient of cucumber in greenhouse

Evapotranspiration and crop coefficient of cucumber in greenhouse

Improving sweet pepper yield and quality by means of fertigation management

Rendimento da cultura da cebola submetida a níveis de água e nitrogênio por gotejamento

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