Épocas de semeadura do milho em ambiente irrigado e sem irrigação

Abstract

Maize (Zea mays L.) is one of the main commodities in Brazil and new technologies need to be studied in order to improve the productivity of this crop. Thus, irrigation is an alternative that allows the guarantee of production when there are rainfall irregularities, especially in the second crop, which provides security against climatic adversities during the growing season. The objective was to evaluate sowing times of corn hybrids with and without irrigation. The experiment was set up in randomized block design in subdivided plots, with irrigation management in the plots (with and without irrigation), subdivided into 3 planting seasons (February 13, 18 and 27, 2021) and two hybrids (H1 - DKB 360 and H2 - NS80). The agronomic aspects evaluated were: plant height, ear insertion height, stem diameter, thousand-grain weight, moisture, ear length, ear diameter, grains per row, and grain yield. Irrigation contributed to the best values found and the growing seasons of corn are related to the influence of climatic conditions, however, this fact may be related to the genetic characteristics of the hybrids evaluated in this experiment. The hybrids did not differ in relation to productivity and under irrigated conditions the second season presented the best result for productivity. Irrigation had a positive influence on the yield components AES, APL DIM, GFI and PMG. Hybrid NS 80 showed the best results when subjected to irrigation and hybrid DKB obtained the highest results of PMG and GF.