Interceptação da radiação luminosa pelo dossel de espécies florestais e sua relação com o manejo das plantas daninhas

Caron, Braulio Otomar; Lamego, Fabiane Pinto; Souza, Velci Queiróz de; Costa, Ervandil Corrêa; Eloy, Élder; Behling, Alexandre; Trevisan, Rômulo

doi:10.1590/s0103-84782012000100013

Cited by 21 publications

(15 citation statements)

References 7 publications

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“…The IPAR values are similar to those found by Caron et al (2012) in between planting lines of from 42.3% in black wattle, 83.2% in bracatinga and 89.1% in eucalypt trees with one year old. In the case of agroforestry systems, the amount of radiation intercepted by the tree component can be considered a determining factor of their deployment in the understory since the radiation transmitted inside the canopy of tree plants should be sufficient for growth and development.…”

Section: Resultssupporting

confidence: 86%

Productive, morphological and qualitative characteristics of sugarcane in the understory tree species in agroforestry systems

Elli¹,

Caron²,

Eloy³

et al. 2016

Afr. J. Agric. Res.

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This study aimed to evaluate productive, morphological and qualitative characteristics of sugarcane in the understory tree species in two agroforestry systems. The study was conducted in the city of Frederico Westphalen, RS, in a randomized complete block design, characterized by a factorial arrangement of 2x5x3, that is, two agroforestry systems (strip and line), five tree species (angico, bracatinga, canafístula, eucalypt and guapuruvu) and three years of sugarcane cultivation (2009, 2010 and 2011), with three replications. The weight, length and stem diameter, number of nodes, Brix degree, juice volume, amount of sucrose, and how these factors are related to the interception of photosynthetically active solar radiation by the tree components in each system were evaluated. The interception of photosynthetically active solar radiation by tree components is smaller in the strip system, but increased over the years of sugarcane cultivation. Among the tree species, eucalypt is responsible for the highest values of interception. When grown in the understory of angico, bracatinga and canafístula, sugarcane presents greater length, diameter and stem weight, juice volume and amount of sucrose, mainly from the second cultivation year than when under the other tree species. The cultivation of sugarcane in the strip system resulted in an increased stem weight and juice volume from the second year of cultivation.

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Section: Resultssupporting

confidence: 86%

Productive, morphological and qualitative characteristics of sugarcane in the understory tree species in agroforestry systems

Elli¹,

Caron²,

Eloy³

et al. 2016

Afr. J. Agric. Res.

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“…Changes in foliage and increased exposure of woody matter in tree canopy will always be determinant of transmittance ( Figure 2) and radiation balance, even with qualitative interference of incident radiant energy in the lower strata of canopies, influencing the establishment and production of both natural surfaces (Floyd et al, 1978) and agroforestry systems (Caron et al, 2012). For annual crops, the extinction coefficient of global solar radiation or photosynthetically active fraction (PAR) is the angular parameter (a) of linear function ln (1-ε int ) = -k.LAI Cardoso et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Área foliar e interceptação de radiação solar pela copa de uma laranjeira

Pilau

Angelocci

2015

Bragantia

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Leaf area changes affect solar radiation interception (K*), interception efficiency (ε int ) and extinction coefficient (k) of an orange tree top (cv. Pêra-Rio). In order to measure radiation transmitted through the crown a mobile sensor was horizontally installed below the crown and 0.65 m from the trunk, moving around it at 3 rpm. The model used for k determination (Monsi & Saeki theory) was assessed with independent data to estimate K*. With absence of leaves, it was detected an intense interference of trunk and branches on ε int , with a minimum value of 0.52. The results were also distinct in obtaining k, when the best fit was found with a quadratic rather than a linear equation, again influenced by woody structures. Simulation of K* using extinction coefficient (k) was statistically classified as good.

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“…The global incident radiation (w m Caron et al, (2012): % Interception = [100 -(R n x 100 / R t )], wherein R n = global incident radiation on the inside of the canopy; R t = global incident radiation on the top of the canopy. The plant leaf area was determined using a sample of 0.10 m 2 per plot with a leaf area integrator LI 3100, LI-COR, NE, USA.…”

Section: Methodsmentioning

confidence: 99%

Effects of growth reducer and nitrogen fertilization on morphological variables, SPAD index, interception of radiation and productivity of wheat

et al. 2015

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The objective of this study was to evaluate the effect of growth reducer and nitrogen fertilization on morphological variables, SPAD index, radiation interception, and grain yield of three cultivars of wheat. The experimental design was a randomized block in factorial scheme 3x5x2, with three cultivars (Mestre, Iguaçú and Itaipú), five nitrogen doses (0, 40, 80, 120, 160 Kg ha -1 ), and application or no application of a growth reducer, with three replications. The following characteristics were evaluated: plant height, SPAD index, leaf area index (LAI), Global Radiation Interception (GRI) and grain yield. The Tukey test (p < 0.05) was used for the comparison between the means of cultivar and growth reducer factors, and for a regression analysis to evaluate N levels. Increasing the dose of nitrogen promotes an increase in LAI of plants of wheat crops differently among cultivars, which leads to a greater degree of global radiation interception. At doses higher or equal to 120 Kg ha -1 of nitrogen, there are significant differences in grain yield between treatments with and without the application of the growth reducer. The significant interaction between growth reducer and nitrogen dose, showed that applications of growth reducer increase the GRI at doses above and below 80 Kg ha -1 of nitrogen. Nitrogen rates of 138 and 109 Kg ha -1 are responsible for maximum grain yields of wheat, which is 4235 and 3787 Kg ha -1 with and without the use of growth reducer, respectively.

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Interceptação da radiação luminosa pelo dossel de espécies florestais e sua relação com o manejo das plantas daninhas

Abstract: 75Interceptação da radiação luminosa pelo dossel de espécies florestais e sua relação com o manejo das plantas daninhas.Ciência Rural, v.42, n.1, jan, 2012. Ciência Rural, Santa Maria, v.42, n.1, p.75-82, jan, 2012

Cited by 21 publications

References 7 publications

Productive, morphological and qualitative characteristics of sugarcane in the understory tree species in agroforestry systems

Productive, morphological and qualitative characteristics of sugarcane in the understory tree species in agroforestry systems

Área foliar e interceptação de radiação solar pela copa de uma laranjeira

Effects of growth reducer and nitrogen fertilization on morphological variables, SPAD index, interception of radiation and productivity of wheat

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