Corn trail analysis with and without Phosphorus use

The present work was carried out to study, through track analysis, the characteristics that most influence grain yield in corn genotypes. The trials were conducted in 2017/18, in the municipality of Santa Maria of Barreiras – PA, a region located in the Cerrado-Amazon Ecótono. Two competition trials of maize cultivars were installed, one in low phosphorus conditions, with 50 kg ha-1from P2O5, and another under high phosphorus, with 100 kg ha-1from P2O5. The experimental design used in each assay was randomized blocks with three replicates and ten treatments (genotypes). The treatments consisted of cultivars found in the local market, which were AG8088PRO2, BRS3046, PR27D28, ANHEMBI, CATIVERDE, 2B655PW, BR206, AG1051, AL BANDEIRANTE, and ORION. The characteristics of plant height were evaluated (AP), height of the spike (AE), diameter of spike (DE), length of spike (CE), and number of grains in row (NGE), weight of the spike (PE) and productivity (PROD). The track analysis was done through the computer program Genes. The variable PE presented the greatest direct effect on yield in corn genotypes in the Cerrado-Amazon region, being the most indicated for indirect selection for grain yield.