Abstract
ABSTRACT The goal of this study was to define an empirical model to calculate the leaf area in rice from linear leaf measure in genotypes used by farmers in Brazil. Through the leaf dimensions it is possible to identify the final crop yield from the LAI. Therefore, the leaves shape is closely related to the production of photoassimilates that will be converted into grain yield. Field experiments were carried out in four counties of Rio Grande do Sul with twelve-three varieties of rice in four growing seasons. We measured the length and width of leaves to construct the model. The relationship between leaf area and linear dimensions was shaped using a linear model for each genotype, and general model grouping all genotypes. The model accuracy was measure following statistics: Root Mean Square Error, BIAS, modified index of agreement and coefficient r. The non-destructive method for individual leaves was appropriate for estimating the leaf area in rice. Moreover, the general equation was estimated and can be used for all modern genotypes of rice in Brazil.
Highlights
Rice (Oryza sativa L.) is a staple crop, feeding three billion people worldwide (Espe et al, 2016)
The major rice production system in Brazil is under flood irrigation, which means that the water is a nonlimiting factor and the temperature and solar radiation are the main meteorologics elements that determine the flooded rice yield potential
The goal of this study was to define an empirical model to calculate the leaf area in rice from linear leaf measure in genotypes used by farmers in Brazil
Summary
Rice (Oryza sativa L.) is a staple crop, feeding three billion people worldwide (Espe et al, 2016). Due to the increase of the world population, it is necessary to invest in research and technology transference aiming to reduce the yield gap in food crops observed between yield obtained at research stations and by farmers yield (Espe et al, 2016, Ribas et al, 2017). In this context, basic studies on crop growth and development for actual rice cultivars in Brazil, the greatest rice producer outside Asian continent, are necessary (Ribas et al, 2017). Leaf area index (green leaf area per unit of soil area) may be calculated throught leaf blade size (Tanaka & Kawano, 1965 and Richter et al, 2014)
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