Abstract
ABSTRACT This study aims to determine the most suitable model to estimate the leaf area of dwarf pigeon pea in function of the leaf central leaflet dimension. Six samplings of 200 leaves were performed in the first experiment, at 36, 42, 50, 56, 64, and 72 days after emergence (DAE). In the second experiment, seven samplings of 200 leaves were performed at 29, 36, 43, 49, 57, 65, and 70 DAE, totaling 2600 leaves. The length (L) and width (W) of the central leaflet were measured in all leaves composed by left, central, and right leaflets, the product of length times width (LW) was calculated, and the leaf area (Y – sum of left, central, and right leaflet areas) was determined by digital images. Linear, power, quadratic, and cubic models of Y as function of L, W, and LW were built using data from the second experiment. Leaves from the first experiment were used to validate the models. In dwarf pigeon pea, the linear (Ŷ = – 0.4088 + 1.6669x, R2 = 0.9790) is preferable, but power (Ŷ = 1.6097x1.0065, R2 = 0.9766), quadratic (Ŷ = – 0.3625 + 1.663x + 0.00007x2, R2 = 0.9790), and cubic (Ŷ = 0.7216 + 1.522x + 0.005x2 – 5E–05x3, R2 = 0.9791) models in function of LW are also suitable to estimate the leaf area obtained by digital images. The power model (Ŷ = 5.2508x1.7868, R2 = 0.95) based on the central leaflet width is less laborious because requires only one variable, but it presents accuracy reduction.
Highlights
The dwarf pigeon pea (Cajanus cajan (L.) Millsp) is a native species from the African continent, belonging to the Fabaceae family
In a research performed by Cavalcante et al (2012), seeking to study the accumulation of nutrients in the dry matter and the nutrient extraction of soil cover crops, the dwarf pigeon pea presented nitrogen accumulation in the dry matter of the aerial part of 26.5 g.kg–1 and extraction of 107.2 kg.ha–1, demonstrating the potential of biological nitrogen fixation when used as a cover crop for green manure
Crop traits such as leaf area are important in plant growth studies (Moraes et al 2013), since it presents a positive correlation with the solar radiation interception rate, the photosynthetic rate, and the dry matter produced by the plant (Porras et al 1997)
Summary
The dwarf pigeon pea (Cajanus cajan (L.) Millsp) is a native species from the African continent, belonging to the Fabaceae family. In a research performed by Cavalcante et al (2012), seeking to study the accumulation of nutrients in the dry matter and the nutrient extraction of soil cover crops, the dwarf pigeon pea presented nitrogen accumulation in the dry matter of the aerial part of 26.5 g.kg–1 and extraction of 107.2 kg.ha–1, demonstrating the potential of biological nitrogen fixation when used as a cover crop for green manure. Crop traits such as leaf area are important in plant growth studies (Moraes et al 2013), since it presents a positive correlation with the solar radiation interception rate, the photosynthetic rate, and the dry matter produced by the plant (Porras et al 1997). The implementation of appropriate crop management practices, such as the selection of plant density at sowing time, fertilization times, pesticides application, and performing cuts are related to the crop leaf area at certain times of its cycle (Silva et al 2011)
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