Crescimento e produtividade do mamoeiro fertirrigado com fósforo por gotejamento superficial e subsuperficial

Souza, Elves de Almeida; Coelho, E. F.; Paz, Vital Pedro da Silva; Filho, M. A. Coelho

doi:10.1590/s0100-29452005000300037

Cited by 7 publications

(7 citation statements)

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“…A avaliação da condição iônica pode ser realizada através de amostragens da solução do solo por meio de extratores de solução (Souza et al, 2005) e do extrato de saturação que é coletado de amostras de solo.…”

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Concentração de nitrato no perfil do solo fertigado com diferentes concentrações de fontes nitrogenadas

Coelho

Costa²,

Silva

et al. 2014

Rev. bras. eng. agríc. ambient.

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R E S U M OObjetivou-se, neste trabalho, avaliar o efeito da concentração de nitrato de potássio e ureia da água de irrigação no teor de nitrato da solução do solo e do extrato de saturação, em duas profundidades do sistema radicular da bananeira tipo Plátano, cultivar Terra Maranhão fertigada. O experimento conduzido entre janeiro e dezembro de 2008 seguiu um delineamento em blocos casualizados com três repetições em esquema fatorial 2 x 4, em que os tratamentos consistiram no uso de duas fontes de nitrogênio (ureia e nitrato de potássio) sob quatro concentrações (2,7; 4,0; 6,5 e 7,2 g L -1), aplicadas via gotejamento, com três emissores de 4 L h -1 por planta. Amostras de solo e de solução do solo foram colhidas mensalmente em todos os tratamentos nas profundidades de 0,30 e 0,60 m, com determinação em laboratório da concentração de nitrato na solução do solo e no extrato de saturação. Os resultados permitiram concluir que o aumento da concentração do fertilizante nitrogenado da água na fertigação implicou em aumento da concentração do íon nitrato na solução do solo e no extrato de saturação para as duas fontes de nitrogênio aplicadas. Concentration of nitrate in the soil profile fertigated with different concentrations of nitrogen sources A B S T R A C TThe objective of this study was to evaluate the effects of concentration of urea and potassium nitrate in the irrigation water on the concentration of nitrate in the soil solution and in saturation extract of soil at two depths of root system of Plaintans banana cv Terra Maranhão under fertigation. The experiment was carried out during the period of January to December, 2008 and followed a randomized block design with three replications in a 2 x 4 factorial scheme where treatments consisted of the use of two nitrogen sources (urea and potassium nitrate) under four concentrations (2.7; 4.0; 6.5 and 7.2 g L -1 ), applied by drip irrigation with three 4 L h -1 emitter per plant. Soil and soil solution samples were collected monthly in all treatments at depths of 0.30 and 0.60 m and nitrate concentration was determined in the soil solution and saturation extract. Results allowed to conclude that the increase of nitrogen fertilizer concentration in fertigation water caused an increase of nitrate ion concentration in the soil solution and in saturation extract for the two applied sources.Concentração de nitrato no perfil do solo fertigado com diferentes concentrações de fontes nitrogenadas

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Concentração de nitrato no perfil do solo fertigado com diferentes concentrações de fontes nitrogenadas

Coelho

Costa²,

Silva

et al. 2014

Rev. bras. eng. agríc. ambient.

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“…The interaction between different doses of nitrogen fertilization showed quadratic behavior for plant height, with estimated maximum values of 192.76 and 167.21 cm for doses of 466.08 and 510.21 g per plant, for the nitrogen sources coated (Figure 2A) and conventional ( Figure 2B) urea, respectively. The maximum values found for the plants cultivated with coated urea (192.76 cm) are low compared to those found by Souza et al (2005) (240.0 cm), who studied the growth and yield of "Formosa" papaya fertirrigated with phosphorus by surface and subsurface drip in Cruz das Almas, BA, Brazil. This fact may be associated with the regional climatic conditions where the experiment was conducted, characterized by high temperature and low relative air humidity throughout the crop cycle (Figure 1), affecting papaya growth.…”

Section: Resultsmentioning

confidence: 55%

Growth, Physiology and Yield of Formosa 'Papaya' Cultivated Under Different Doses of Coated and Conventional Urea

et al. 2016

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Mineral fertilizer management is one of the most important agronomic techniques applied in papaya cultivation, which generally extracts large amounts of nutrients from soil, especially nitrogen. This study aimed to assess the phytotechnical and physiological attributes and yield of "Formosa‟ papaya hybrid Caliman 01 as a function of different doses of coated and conventional urea in the region of Bom Jesus - PI, Brazil. The treatments were arranged in a factorial scheme (2 × 4) and distributed in a randomized block design with four replications, corresponding to 2 nitrogen sources (coated urea, 43% of N; and conventional urea, 45% of N) and 4 doses nitrogen (350, 440, 530 and 620 g per plant). The N doses used corresponded to 80, 100, 120 and 140% of the nitrogen fertilization. It was used six plants per plot with two row borders, totaling 192 plants cultivated in the field. It was assessed the intercepted photosynthetically active radiation (int.PAR), radiation interception efficiency (PAREff.), leaf area index (LAI), plant height, stem diameter and yield. The coated urea promotes a higher growth and yield of "Formosa‟ papaya compared to the conventional urea. The application of 1.0 g of coated N promotes the production of 2.87 g of fruit per hectare while the application of 1.0 g of conventional N produces only 1.89 g of fruit per hectare, showing that the source of polymerized N increases the use efficiency of N applied to soil.

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“…Plant height and leaf area were evaluated at 320 DAP, in the last harvest. The height was measured with a flexible ruler, from the root collar of the plant to its apical bud, and the leaf area was by using the methodology described by Souza et al (2005).…”

Section: /8mentioning

confidence: 99%

Irrigation of papaya in a sandy loam soil in the semiarid of Bahia, Brazil

Melo

Coelho

Silva

et al. 2020

Agraria

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Irrigated farming enables producing papaya in Iaçu, located in the semiarid region of Bahia. However, water must be used efficiently, as the local availability of irrigation water resources is restricted. This study was conducted with the objective of defining the irrigation depth that provides the best agronomic performance of the Tainung No. 1 papaya cultivar, in a sandy loam soil of Iaçu, in the semiarid of Bahia, under the irrigation management conditions adopted by the producer. The experimental design used was of randomized blocks with four replicates. The experimental plot consisted of a row of plants, containing two border plants and twelve useful plants. Treatments corresponded to the total water depth of 1.103; 1.702; 2226; 2.751; 3.349 mm. Studied variables were height, leaf area, fruit number and yield, water use efficiency, fruit weight, fruit diameter and length, pulp width, pulp water content, pH, soluble solids and titratable acidity. Growth and production of the papaya tree responded positively to the applied water depths, but there was no interference in fruit quality. The yield showed linear adjustment, with a calculated maximum at 123.845 t ha-1 obtained for 3.349 mm. With the increasing water depth applied, there was a reduction in water use efficiency due to percolation water loss.

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Crescimento e produtividade do mamoeiro fertirrigado com fósforo por gotejamento superficial e subsuperficial

Cited by 7 publications

References 2 publications

Concentração de nitrato no perfil do solo fertigado com diferentes concentrações de fontes nitrogenadas

Concentração de nitrato no perfil do solo fertigado com diferentes concentrações de fontes nitrogenadas

Growth, Physiology and Yield of Formosa 'Papaya' Cultivated Under Different Doses of Coated and Conventional Urea

Irrigation of papaya in a sandy loam soil in the semiarid of Bahia, Brazil

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