Path analysis and near-infrared spectroscopy in canola crop

Abstract

This study measured the effect of the association between agronomic traits related to the yield of canola grains grown at different sowing dates through path analysis. Another objective was to obtain a method to predict the oil content in the grains, fitting a multivariate model through near-infrared (NIR) spectroscopy analysis. The experiment was conducted in the field using a randomized block design in plots subdivided by time, with four plots (sowing dates), six subplots (canola hybrids), and four replicates. In each hybrid, phenological observations were performed, and the grain yield was determined. The data were subjected to analysis of variance in the R environment using the F test at 5% probability. The oil content in the grains was determined by the traditional chemical method, and based on the NIR spectral signature of the grain samples, partial least squares regression (PLS-R) was established to estimate the oil content in the canola grains. The sowing dates influenced the production components and oil content of the grains of all hybrids. The trait number of grains in five plants (0.6857) and their height (0.4943) had greater estimates of positive correlations with grain yield, as well as higher values of positive direct effects on yield (0.2494 and 0.1595, respectively). The NIR technique combined with PLS-R was able to predict the oil content in the grains, resulting in good predictive models (R2 of 0.86 and root mean square error (RMSE) of 1.56 in external validation).

Agronomic performance of canola hybrids in Campos das Vertentes - MG

“…This is a result of a smaller number of siliques per plant, combined with unfavorable weather conditions for flowering and development of the siliques (Figure 2 and Table 5). Other studies conducted in other regions of the country show that delays in sowing cause a reduction in grain yield (Rosa et al, 2020;Araújo et al, 2021;Santiago et al, 2022), as observed in this study.…”

“…Different researchers report that different canola hybrids respond to sowing dates, and in general, cultivation carried out between the first fortnight of February and the first fortnight of March in the Center-South region of Brazil obtained the best responses in crop yield (Rosa et al, 2020;Araújo et al, 2021;Santiago et al, 2022). In the Agricultural Zoning of Climate Risk (MAPA, 2021) for canola, it is reported that the months of February and March are the best growing seasons, depending on the cycle of the hybrid to be used.…”

Vigor de sementes de canola pelo teste de deterioração controlada

“…Some studies have reported its potential in warmer climates, particularly for grain production in the Brazilian Cerrado, given its protein and oil content of approximately 24 to 27 and 38%, respectively (Rigon et al, 2017). However, research aimed at developing crop management technologies remains scarce, with a need for investment in breeding programs to ensure significant yield gains and, consequently, expansion of the planted area (Santiago et al, 2022).…”