Estação chuvosa e de cultivo para a região de Rio Largo, Alagoas baseada em métodos diretos e sua relação com o El Niño - Oscilação Sul

Souza, José Leonaldo de; Lyra, Guilherme Bastos; Silva, Eduardo Cabral da

doi:10.1590/s0102-77862013000200008

Cited by 17 publications

(16 citation statements)

References 8 publications

(4 reference statements)

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“…No estado de Alagoas, a produtividade é fortemente prejudicada pela ocorrência de veranicos durante a época chuvosa, que se inicia em abril e termina em outubro, na região de Rio Largo (CARVALHO et al, 2013). Conforme Brito et al (2013), a ocorrência de déficit hídrico durante o pendoamento e o enchimento dos grãos causam perdas na produtividade agrícola, pois nessa fase ocorre a síntese de componentes do rendimento.…”

Section: Introductionunclassified

Épocas de plantio e dose econômica de nitrogênio para o milho cultivado nos Tabuleiros Costeiros Alagoanos

Silva

Costa²,

Nascimento³

et al. 2016

AGRO@MBIENTE ON-LINE

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Objetivou-se, com este trabalho, determinar a dose econômica de adubação nitrogenada para o milho em quatro épocas de cultivo. O experimento foi conduzido em delineamento em blocos casualizados, em esquema de parcelas subdividas, com quatro repetições. As parcelas foram constituídas por quatro épocas de plantio (E1: 28/05, E2: 11/06, E3: 25/06 e E4: 22/07) e nas subparcelas foram aleatorizadas quatro doses de N (0, 75, 150 e 225 kg ha-1). A cultivar de milho foi a AG7088, sendo a produtividade medida na fase de grão farináceo. A produtividade agrícola foi de 8,0; 7,5; 5,9 e 6,3 t ha-1 em E1, E2, E3 e E4, respectivamente. A resposta do milho ao N foi significativa, em que a dose de 225 kg ha-1 de N proporcionou média de 4,0 t ha-1 a mais quando comparada ao cultivo sem adubação nitrogenada. Para o valor médio da saca de milho igual a R$ 30,00, a dose máxima econômica é 174, 163, 215 e 52 kg ha-1 de N para o plantio em 28/05, 11/06, 25/06 e 11/07 de 2014, respectivamente, e a dose econômica média é 151 kg ha-1.

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Section: Introductionunclassified

Épocas de plantio e dose econômica de nitrogênio para o milho cultivado nos Tabuleiros Costeiros Alagoanos

Silva

Costa²,

Nascimento³

et al. 2016

AGRO@MBIENTE ON-LINE

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“…In this sense, local agriculture is commonly practiced in the rainy season. However, one way to cultivate in the dry season is to use irrigation, and there is a need to study the water depth appropriate to the crop (Carvalho et al, 2013). It is believed that in the first experiment with emphasis on rainfall, the combination of environmental factors have provided optimal growth environment, overcoming the effect of the treatments.…”

Section: Discussionmentioning

confidence: 99%

Production components and water use efficiency of corn under irrigation depths

Anjos¹,

Azevedo²,

Ferraz³

et al. 2017

Aust J Crop Sci

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This study aims to analyze the production components and the water-use efficiency of corn cultivated with irrigation depths, and also to verify the utilization of multivariate analysis is suitable to highlight the relevant information. Hybrid corn AG 7088 was used as plant material. Two experiments were conducted under field conditions at two different experimental periods between the months of April and December 2015 in a randomized block design with six irrigation depths [50, 75, 100 (control), 125, 150, and 175% replacement of evapotranspiration -ET 0 ] and four replications. At 120 days after sowing, the following variables were evaluated: mass of one thousand grains, number of spikes per plot, yield of dry grains, ear length, ear diameter, number of lines per ear, number of grains per line, number of ears grain per spike, grain mass per spike, cob mass, spaghetti mass, and mass of straws. The results showed that production components and water use efficiency of hybrid corn AG 7088 were not affected by the varying water depths in the first experimental period. In the second period, the increase in water depth supported a gain in the mass of a thousand grains, dry grain yield, grain number per row, grain number per ear, corn cob mass and mass of dehusked ear, reducing the efficiency of water use. The use of multivariate analysis was able to reduce the multi-dimensional space of the set of variables in the three Principal Components with relevant information to highlight differences between irrigation depths and experimental periods.

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“…The maize crop in this region predominates in the rainy season, which occurs from April to August, but in some years occurs periods without rain in the rainy season and the crop is subject to water deficit (Carvalho et al, 2013). Because it is the vehicle of conduction of the nutrients to the root-soil interface and in the xylem, water may interfere with plant physiology, absorption dynamics and nutrient utilization (Ferreira et al, 2008).…”

Section: Uso Econômico Da áGua No Cultivo Do Milho Irrigado Pormentioning

confidence: 99%