Irrigação e tipos de poda no cultivo de pinhão-manso em Piracicaba, SP

Santos, Otávio Neto Almeida

doi:10.11606/d.11.2016.tde-06042016-175801

Cited by 2 publications

(3 citation statements)

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“…A alteração do Kc proporcionou reduções das demandas (Figura 3) considerando os mesmos cálculos e dados climáticos. Mesmo com as reduções na demanda requerida pelas culturas, os valores aqui descritos são superiores aos relatados na literatura (SILVA et al, 2001;GONDIM;TEIXEIRA, 2007;SILVA et al, 2015b;OLIVEIRA et al, 2015;SANTOS et al, 2016). Isto se deve a vários fatores como metodologia de cálculo, utilização de diferentes valores de Kc e principalmente devido aos valores de evapotranspiração da série climática.…”

Section: Resultados E Discussõesunclassified

“…A escolha adequada da época para poda já é uma técnica muito utilizada na região de Petrolina -PE, para modificar o desenvolvimento da planta e induzir alguns princípios fisiológicos fundamentais, como reduzir o crescimento vegetativo em excesso e estabelecer um calendário de produção. Assim, este manejo aliado à época adequada de cultivo e o fornecimento adequado de água pode favorecer uma boa produtividade, em aspectos qualitativos e quantitativos (SANTOS, 2016).…”

Section: Resultados E Discussõesunclassified

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Estimativa Da Demanda Hídrica De Diferentes Culturas No Perímetro Irrigado Pontal Sul

Souza

Santos

Ramos

et al. 2021

R_I

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ESTIMATIVA DA DEMANDA HÍDRICA DE DIFERENTES CULTURAS NO PERÍMETRO IRRIGADO PONTAL SUL MARCELLO HENRYQUE COSTA DE SOUZA1; ROBERTA DANIELA DA SILVA SANTOS2; CLOVIS MANOEL CARVALHO RAMOS3 E LUÍS HENRIQUE BASSOI4 1 Setor de Operação do Sistema, Distrito de Irrigação Nilo Coelho – DINC, Vila CS-1, Perímetro Senador Nilo Coelho s/n. CEP: 56.300-990. Petrolina-PE, Brasil, marcello_henry@hotmail.com; 2 Instituto Federal de Educação, Ciência e Tecnologia de Roraima – IFRR, campus Novo Paraiso, BR-174, s/n - Vila Novo Paraíso, Caracaraí – RR. CEP:69365-000, Brasil, roberta.santos@ifrr.edu.br; 3 Colegiado de Engenharia Agrícola e Ambiental, UNIVASF, Avenida Antônio Carlos Magalhães, 510 - Santo Antônio. CEP: 48902-300 – Juazeiro – BA, clovis.ramos@univasf.edu.br; 4 Embrapa Instrumentação, R. 15 de Novembro, 1452 - Centro, São Carlos – SP. CEP:13560-970, Brasil. luis.bassoi@embrapa.br. 1 RESUMO O presente trabalho objetivou determinar a demanda hídrica para diferentes culturas no Perímetro Irrigado Pontal Sul e verificar se a lâmina fornecida é capaz de atender ou não as necessidades das culturas; identificar quando e qual cenário há maior necessidade de água; e definir quais cenários baseados em diferentes culturas e na disponibilidade de água poderão ser atendidos de acordo com a capacidade de bombeamento do perímetro irrigado. Para alcançar tais objetivos foram feitos levantamentos de dados, estudos bibliográficos, geração de cenários agrícolas (considerando diferentes culturas – Acerola, Caju, Goiaba, Banana, Coco, Uva e Manga) e estimativa das demandas do Perímetro Irrigado Pontal Sul. De acordo com os cenários gerados, o perímetro irrigado apresenta, em parte, dados que favorecem a superestimação de valores de água a serem fornecidos, porém também apresenta problemas no que diz respeito ao fornecimento de água para as culturas quando avaliados cenários e condições de exigência máxima das culturas. Assim, este estudo mostra a necessidade do estudo prévio e uma alternativa para um planejamento adequado para implantação das culturas e uso de sistemas de irrigação no Perímetro Irrigado Pontal Sul. Palavras-chave: irrigação, planejamento agrícola, uso de água. SOUZA, M. H. C.; SANTOS, R. D. S.; RAMOS, C. M. C.; BASSOI, L. H. ESTIMATION OF WATER DEMAND BY CROPS FOR WATER ALLOCATION IN PONTAL SUL IRRIGATION SCHEME 2 ABSTRACT This work aimed to determine the water demand for different crops in the Pontal Sul Irrigation Scheme and to verify if the water depth supplied is capable of attending crop water demands; to identify when and which scenario the water demand is maximum; and to define which scenarios based on different crops and on water availability can be met according to the pumping capacity of the irrigation scheme. To achieve these objectives, data surveys, bibliographic studies, generation of agricultural scenarios (considering different cultures - Barbados cherry, Cashew, Guava, Banana, Coconut, Grape and Mango) and estimation of the demands of the Pontal Sul Irrigated Perimeter were made. According to the scenarios generated, the Pontal Sul irrigated project presents, in part, data that favor the overestimation of water values to be provided, but it also presents problems related to water supply for crops in scenarios and conditions of maximum crop requirements. Thus, this study shows the need for a previous study and an alternative for planning for cropping and the use of irrigation systems in Pontal Sul Irrigation Scheme. Keywords: irrigation, agricultural planning, water use.

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Section: Resultados E Discussõesunclassified

Estimativa Da Demanda Hídrica De Diferentes Culturas No Perímetro Irrigado Pontal Sul

Souza

Santos

Ramos

et al. 2021

R_I

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“…According to , jatropha can reach up to 5,000 kg ha -1 depending on the crop management. Studies with seedling (MAES et al, 2009) and plant resistance to drought stress (LUÍS, 2009), as well as the seed yield improvement when cultivated with irrigation (EVANGELISTA et al, 2011;OLIVEIRA et al, 2012;SANTOS, 2015;ANDRADE, 2016) were essential to understand the plant characteristics. In addition, the literature shows several studies with the jatropha oil characteristics, especially for the oil usage on partial and total diesel replacement.…”

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confidence: 99%

Crop evapotranspiration and crop coefficient of jatropha from first to fourth year

Lena¹

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Water requirements from crops in an important information to manage irrigation. Jatropha (Jatropha curcas L.) actual crop evapotranspiration (ETc) and crop coefficient (Kc) is still unknown, which is necessary to understand the plant water demand dynamic, as well as to stablish strategies to improve irrigation efficiency. The objective of this study was to determine jatropha ETc and Kc from 1 st to 4 th growing year. The experiment was performed from March 2012 to August 2015 at "Luiz de Queiroz" College of Agriculture (ESALQ)/University of São Paulo (USP), Brazil. The experiment was divided into center pivot, drip, and rainfed treatments. Two large weighing lysimeters (12 m 2 surface area) were used per treatment to perform jatropha ETc determination (one plant per lysimeter). Reference evapotranspiration (ET0) was determined by grass based Penman-Monteith method using data from a weather station located close to the experiment. Kc was determined for the irrigated treatments by the ration between ETc and ET0 (Kc=ETc/ET0). For all years analyzed, ETc values ranged from 0.7 to 8 mm d-1 for center pivot treatment, from 0.6 to 7.4 mm d-1 for drip treatment, and from 0.4 to 5.4 mm d-1 for rainfed treatment. It was observed higher values for irrigated treatments in comparison to rainfed treatment, which was explained by the higher soil water availability provided by irrigation. In the 1 st year, Kc was 0.47 for both treatments, varying from 0.4 to 0.9. In the 2 nd , 3 rd , and 4 th year, Kc ranged from 0.15 to 1.38 for center pivot treatment and from 0.15 to 1.25 for drip treatment. Kc average for 2 nd , 3 rd , and 4 th during vegetative and productive growing stages together was 0.77, 0.93, and 0.82 for center pivot treatment, respectively, and 0.69, 0.79, and 0.74 for drip treatment, respectively. The reason Kc for center pivot treatment was slightly higher than drip treatment was due the high soil moisture after irrigation event, increasing soil evaporation rates. Annual ETc and Kc fluctuation in 2 nd , 3 rd , and 4 th years was very similar, which was explained by the growing stage and the leaf area index dynamic during the year, presenting values varying from 0 to 0.5 in the 1 st year, from 0 to 1.4 in the 3 rd year, and from 0 to 2 in the 3 rd year. The comparison between Kc and leaf area index showed, for center pivot treatment, a logarithmical equation with coefficient of determination (R 2) and root mean square error (RMSE) of 0.7877 and 0.3831, respectively, and 0.8655 and 0.1419 for drip treatment, respectively. For all three years analyzed, Kc related to cumulative thermal unit showed a 3 rd degree polynomial equation for both treatments, with R 2 ranging from 0.3373 to 0.6297 in the center pivot treatment and from 0.5445 to 0.6386 in the drip treatment.

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Irrigação e tipos de poda no cultivo de pinhão-manso em Piracicaba, SP

Cited by 2 publications

References 38 publications

Estimativa Da Demanda Hídrica De Diferentes Culturas No Perímetro Irrigado Pontal Sul

Estimativa Da Demanda Hídrica De Diferentes Culturas No Perímetro Irrigado Pontal Sul

Crop evapotranspiration and crop coefficient of jatropha from first to fourth year

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