STRATIFIED SELECTION OF MACAÚBA GENOTYPES FOR PRODUCTIVITY AT THREE TECHNOLOGICAL LEVELS

Macaúba is a plant with a mixed reproductive system propagated by seeds. Each plant is a unique genotype. Therefore, conserved plants or plants established in experimental areas should be observed aiming at the maximum use of the germplasm and identification of promising genotypes. The objective of this study was to select macaúba genotypes established at three technological levels for productivity. The following were analyzed: number of bunches/plant, number of fruits/plant, average fruit mass (g) on a wet basis (40% moisture) and productivity (ton/ha) on a wet basis, observed for four cycles between 2014 and 2019, in accession plants in the region of Ituverava (SP) and Planaltina (DF). The observed plants were established in December 2008 in an experimental area at three technological levels: low (non-irrigated and unfertilized, 37 plants), medium (non-irrigated and fertilized, 71 plants) and high (irrigated and fertilized, 38 plants).  Statistical analysis was performed separately for each level using the Selegen-REML/BLUP software, using the Basic Model of Repeatability Without Design (Model n° 63). The estimated repeatability coefficients (r) showed values ranging from low magnitude (r ≤ 0.30) to moderate (0.30 < r < 0.60) for the observed characters considering the three technological levels. The value of selective accuracy was high (Acm > 0.70) for all traits at the levels employed, except for the number of fruits (Acm 0.56) and yield (Acm 0.47) at the high level