CARACTERÍSTICAS MORFOAGRONÔMICAS DO MILHO EM FUNÇÃO DE DIFERENTES NÍVEIS DE DESFOLHA ARTIFICIAL

Abstract

The objective of this study is based on the evaluation of morphoagronomic characteristics of simple hybrids of maize P3862H, depending on the application of different intensities of artificial defoliation, carried out in R1, when the style-stigmata were fertilized. The experiment was installed and conducted in an experimental area of the Federal Institute Goiano of Education Science and Technology, Campus Morrinhos, state of Goiás, during the agricultural year 2015/2016. We applied the design of completely randomized block with eight treatments: removal of a sheet above and one below the ear, removing two leaves above and below the ear, removing three leaves above and below the ear, removal of all leaves of the plant, removal of all leaves above the ear, removal of all leaves below the ear, removing the sheet in the ear, control without defoliation, in four replications. The traits evaluated were stand of plants, number of plant lodging, prolificacy, density, length and diameter of the cob, length of a grain weight of 000 grains, grain mass cob-1 and productivity. The data obtained were subjected to analysis of variance by F test at 5 % probability, noting that all variables were influenced as to the effects of the treatments employed. The filling of grains is closely related to photosynthesis. Without the leaves this phase was fully committed, resulting in lower production of carbohydrates and lower volume of dry matter in grains.