Estimativa de área foliar em cultivares de videira

Abstract

Brazil stands out as one of the world's largest fruit producers. Among the fruit crops, there is a special focus on grapes, which have been gaining ground on several fronts. National production has grown, driven by increased domestic consumption as well as the expansion of exports. One of the parameters used to estimate crop production is the leaf area index (LAI), which is of great importance for evaluating plant growth. Its correct determination during the crop cycle makes it possible to model plant growth and development, and consequently the productivity and total production of the crop. Leaf area is considered an indicative criterion of productivity. The objective of this work was to obtain mathematical models to estimate the leaf area of three grape cultivars available in the northwest region of Rio Grande do Sul using the non-destructive method, based on the linear dimensions of the leaves. Through the collected data, 3 models were obtained to estimate the leaf area of grapevine cultivars, which presented a high coefficient of determination. The models that were generated to estimate leaf area from the product of the leaf blade width were the most accurate for the three cultivars. Likewise, the leaf blade width estimation models were the ones that achieved the greatest accuracy. The linear model generated from the width of the leaf blade was the most precise, accurate and reliable for estimating the leaf area of the grapevine, regardless of the cultivar analyzed. Comparing the observed leaf area with the estimated leaf area, it can be seen that the models showed good precision, and can therefore all be used to estimate the leaf area with good correlations between the estimated and observed areas. When the leaves to be analyzed are larger, the equations tend to overestimate the value of the leaf area.