Rami: análise de cinco anos de irrigação e adubação em Campinas

Pires, Regina Célia de Matos; Arruda, Flávio Bussmeyer; Júnior, Romeu Benatti; Tosello, Rino N.; Medina, Júlio César

doi:10.1590/s0006-87051988000200018

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The T1 has fewer emitters per plant, and therefore with less wetted area provided by the drip, it showed the highest number of roots in the wet bulb region. This fact possibly justifies the good performance of irrigated orchards in São Paulo with only one dripper per line, as reported by Pires et al (2005), and it agrees with the results reported by SHALHEVET & LEVY (1990). It should be noted that this must also be associated with the daily frequency of irrigation.…”

Section: Methodssupporting

confidence: 90%

“…To monitor and make necessary adjustments during the irrigation management, tensiometers were installed at depths of 0.30, 0.60 and 0.90 m to ensure that the soil water potential was always kept within desirable limits to maintain adequate water consumption of the plants in the potential condition, considering after irrigation, the water in the soil was within the upper limit of soil water retention (PIRES et al, 2005) with the completion of daily irrigations to a depth of 0.60 m. Irrigation control was performed in accordance with tensiometer measurements. To monitor soil moisture, a model DIVINER2000 was used to probe high-frequency capacitance (FARES et al, 2004).…”

Section: Methodsmentioning

confidence: 99%

“…It was performed calibration of the probe capacitance in the soil of the experimental area. In trickle irrigated treatments, access tubes were installed in the direction of the rows, 0.15 m from the dripper and located between 1/3 to 2/3 radiuses of the tree crown (PIRES et al, 2005). In the treatment irrigated by microsprinkler, pipes were installed in the same position in relation to the plant and about 0.80 to 1.0 m from the emitter.…”

Section: Methodsmentioning

confidence: 99%

“…In large areas of commercial citrus cultivation in Brazil, percentage values of wet area between 10 and 20% have been adopted. In this context, increases in average production of about 20 to 55% have been achieved (PIRES et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effect of trickle irrigation on root development of the wet bulb and 'pera' orange tree yield in the state of São Paulo, Brazil

et al. 2011

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The aim of this study was to evaluate the effect of different microirrigation designs on root system distribution in wet bulb region, orange orchard yield and quality of orange fruits. The experiment was installed as random blocks with five treatments and four replicates in an orchard of 'Pêra' orange trees grafted on 'Cleopatra' mandarin rootstock. The treatments consisted of: one drip line (T1), two drip lines (T2), four drip lines (T3) per planting row, microsprinkler irrigation (T4) and without irrigation (T5). Irrigation treatments favored yield and ºBrix. The treatment with a single drip line (T1) showed the greatest quantity of roots in relation to the treatments T2 and T3.

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Section: Methodssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of trickle irrigation on root development of the wet bulb and 'pera' orange tree yield in the state of São Paulo, Brazil

et al. 2011

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“…Considerando-se a profundidade efetiva de 60 cm do sistema radicular da laranja (Pires et al, 2005), não foram observadas perdas de nutrientes por lixiviação na solução do solo na média das variáveis analisadas durante os 11 meses de amostragem, no presente ensaio (Tabela 1). Segundo Raij (1991) Os valores de produção observados em ambas as cultivares podem ser considerados baixos, para pomares irrigados e com fertirrigação.…”

Section: Resultsunclassified

Dinâmica de nutrientes na solução do solo em pomar fertirrigado de citros

Souza

Bôas

Quaggio

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a dinâmica de nutrientes na solução do solo após a aplicação, via fertirrigação, de nitrogênio, fósforo e potássio a laranjeiras. O experimento foi realizado entre setembro de 2007 e outubro de 2009, em pomares de laranjeiras 'Valência' e 'Hamlin', enxertadas sobre citrumeleiro 'Swingle'. Foram avaliadas cinco doses de N, P 2 O 5 e K 2 O (0, 25, 50, 100 e 200% da dose recomendada). A solução do solo foi extraída a 30 e 60 cm de profundidade, com o auxílio de extratores com cápsulas porosas. Foram realizadas 11 avaliações durante o período experimental, com as extrações iniciadas após 12 horas das fertirrigações. O aumento das doses reduziu o pH (pH~3,5, na maior dose), e aumentou a condutividade elétrica (CE~1,5 dS m -1 , na maior dose) e os teores de NH 4 , NO 3 , P, K, Mn e Zn na solução do solo, nas duas profundidades amostradas. Nos meses com maior precipitação pluvial, houve perda potencial de nutrientes por lixiviação, pois maiores concentrações de NO 3 , K e B foram observadas à profundidade de 60 cm. A análise da solução do solo, obtida por extratores com cápsula de cerâmica porosa, pode ser considerada ferramenta auxiliar para monitorar e avaliar a disponibilidade de nutrientes às plantas.Termos para indexação: Citrus sinensis, acidificação, cápsula porosa, extrator de solução, fertirrigação, lixiviação. Nutrient dynamics in soil solution in a fertigated citrus orchardAbstract -The objective of this work was to evaluate nutrient dynamics in soil solution after fertigated application of nitrogen, phosphorus, and potassium to orange trees. The experiment was carried out from September 2007 to October 2009, in 'Valência' and 'Hamlin' orange orchards grafted onto citrumelo 'Swingle' rootstock. Five doses of N, P 2 O 5 and K 2 O (0, 25, 50, 100 and 200% of the recommended dose) were evaluated. Soil solution was extracted from 30 and 60 cm soil depths using extractors with porous cups. Eleven evaluations were done during the experimental period, with extractions beginning 12 hours after fertigation. Increasing nutrient doses decreased pH (pH~3.5, at the highest dose), and increased electrical conductivity (CE~1.5 dS m -1 , at the highest dose) and the amounts of NH 4 , NO 3 , P, K, Mn, and Zn in the soil solution, in both sampled depths. In the months with heavier rainfall, there was nutrient potential losses by leaching, since higher concentrations of NO 3 , K, and B were observed at the 60 cm soil depth. Soil solution analysis, obtained by extractors with porous ceramic cups, can be considered an auxiliary tool for monitoring and assessing nutrient availability to plants.

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Deep rooting of rainfed and irrigated orange trees in Brazil

Adriano

Laclau

Rodrigues

2016

Trees

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Although the crucial role of deep rooting on the hydraulic functioning of tropical trees has been pointed out, studies dealing with root development below 2 m are still scarce. Our study aimed to gain insight into the fine root traits of rainfed and irrigated orange trees down to the root front in deep tropical soils. Irrigation was applied during dry periods, only 3–15% more than the annual amounts of water supplied by rain. Fine roots were sampled down to a depth of 8 m on four dates in a randomized block design. The effects of soil depth and irrigation on major fine root traits, total fine root length and the relationship between leaf area index (LAI) and root area index (RAI) were studied. The total fine root mass was 728 g m−2 in rainfed plots and 536 g m−2 in irrigated plots during the driest period (Sept/Oct 2012). Across the four sampling dates, the mean depth of the root front was 6.1 m in rainfed plots and 5.5 m in irrigated plots close to the trees, and approximately 4.5 m in the inter-row covered by Brachiaria decumbens plants. LAI was little influenced by irrigation (about 4.5 m2 m−2), but mean RAI was 19.1 m2 m−2 in rainfed plots and 13.7 m2 m−2 in irrigated plots. Small irrigation rates reduced root development in very deep soil layers, and increased fruit production by 9% during the dry year. Deep rooting provides access to water stored in deep soil layers during the rainy season, and thus might have an important functional role during dry periods in tropical orange orchards. (Résumé d'auteur

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Rami: análise de cinco anos de irrigação e adubação em Campinas

Cited by 4 publications

References 2 publications

Effect of trickle irrigation on root development of the wet bulb and 'pera' orange tree yield in the state of São Paulo, Brazil

Effect of trickle irrigation on root development of the wet bulb and 'pera' orange tree yield in the state of São Paulo, Brazil

Dinâmica de nutrientes na solução do solo em pomar fertirrigado de citros

Deep rooting of rainfed and irrigated orange trees in Brazil

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