Estimação da área foliar de triticale por dimensões foliares

Abstract

The leaf area is an important indicator of the growth of agricultural crops. In this sense, the objective of this work was to estimate the leaf area of triticale as a function of linear dimensions of non-flags and flags leaves. The experiment with the triticale cultivar IPR111 was carried out in the 2016 harvest. At 93 days after sowing, 200 non-flags and 200 flags leaves were collected for the generation of mathematical models to estimate the leaf area as a function of the leaf linear dimensions. At 106 days after sowing, 100 non-flags and 100 flags leaves were collected for the validation of these models. In each of the 600 leaves, the length (C) and width (L) of the leaf limbus were measured with millimeter ruler and then the product length times width (C × L) and length width ratio (C / L) were estimated. The leaves were then scanned and the real leaf area determined using digital images with Digimizer v.4.5.2® Software. For non-flags and flags leaves were generated and validated linear (Y = a + bx), quadratic (Y = a + bx + cx²) and potency (Y = ax^b) models for the estimation of the real leaf area (Y), where x represented the linear dimension of the leaf (C, L or C × L). The morphology of non-flags and flags leaves is different. Regardless of the type of leaf (non-flag or flag) and type of model (linear, quadratic or potency), the best triticale leaf area estimation models are those that use C × L as the explanatory variable. To estimate the leaf area of nonflags leaves the linear (Ŷ = 1,1000 + 0,7633x; R² = 0,9743), quadratic (Ŷ = - 0,1144 + 0,8310x - 0,0009x², R² = 0.9746) and potency (Ŷ = 0.8945x⁰·⁹⁶⁶⁸; R² = 0.9757) models where x represents C × L, can be used. To estimate leaf area of flags leaves the linear (Ŷ = - 0.4088 + 0.7435x; R² = 0.9893), quadratic (Ŷ = 0.7992 + 0.6602x + 0.0012x² ; R² = 0.9899) and potency (Ŷ = 0.7212x¹·⁰⁰²⁹; R² = 0.9886) models where x represents C × L, can be used.