Variabilidade Espacial dos Caracteres da Pluma de Algodão

Abstract

Final cotton quality is of crucial importance and is influenced by fiber characteristics. The objective of this study is to map and evaluate the correlation between cotton lint productivity and lint quality analyses based on results from the High-Volume Instruments (HVI) using geostatistics. The x and y directions of the Cartesian coordinate system were defined, and a geostatistical experimental grid was staked out. Sample points were spaced 9.9 meters apart, equally squared among all 100 constituent points. The following were analyzed: Cotton lint productivity (PA), Spinning Consistency Index (SCI), Micronaire (Mic), Upper Half Mean Length (UHML), Short Fiber Index (SF), Strength (Str), and Leaf Grade (TrId). Results were presented through semivariograms and kriging maps of the studied attributes, showing zones with the values found. Results also indicate that cotton cultivated in Mato Grosso do Sul has fiber test results very similar to those found in cotton varieties in different parts of the world such as Africa, Europe, and Asia. PA, SCI, Mic, UHML, SF exhibited spatial variability. The attributes (SCI) and (UHML) showed a negative correlation with cotton lint productivity, while the SF showed a positive correlation with cotton lint productivity.