AVALIAÇÃO DA POPULAÇÃO DO NEMATOIDE DAS LESÕES RADICULARES EM DIFERENTES DOSES DE N NO MILHO

Abstract

Corn ranks second among the most produced crops in Brazil. For this crop, nitrogen is an extremely important macronutrient to form amino acids and proteins, guaranteeing plant growth. However, there are several factors that can reduce productivity, especially phytonematoids, which feed on the sap of the roots. One of the main recurring species is Pratylenchus brachyurus. The objective was to evaluate a population of this nematode, in relation to different doses of N, in cover, in corn. The experiment was conducted in the field at IF Goiano, in DBC, with five treatments (0, 75, 150, 225, 300 kg N.ha-1). The experiment was carried out in a naturally infested area. At 45 DAP and at stage R4 (silage), the population of the phytonematoid in soil and root, the FR, was determined and phytotechnical analyzes were performed on corn: Stem diameter, Height of plants, Height of ear insertion, Distance between node, Number of rows per ear, Number of grains per row, Chlorophyll A, Productivity and MF. Phytotechnical data increased according to the N dose and P. brachyurus increased its population in both analyzes due to the increase in N in the soil, as well as its RF with increasing doses.