Épocas de semeadura e produção do milho segunda safra em Sinop-MT

Abstract

Among the different factors that affect maize production, precipitation and average temperature, which reflect the sowing season and may directly interfere in the expression of the productive potential of the crop, stand out. The objective of this study was to identify the best sowing season for second crop corn in the northern region of Mato Grosso. The experiment had been conducted at Água Viva farm, located in the municipality of Sinop, Mato Grosso. A randomized block design (DBC) with three replications and five sowing dates was used (01/02/2017; 02/02/2017; 02/22/2017; 02/22/2017; 03/15/2017; 03/15/2017 ). The evaluated agronomic characteristics were: plant height, stalk diameter, number of rows, number of grains per row and grain yield. Corn sowing in the second season resulted in higher values of height and stem diameter of maize plants and decreased linearly thereafter. Maize cultivation after the second season reduced the number of rows and grains per rows in corn cobs. There was a reduction of 4% in the number of rows and 15.3% in the number of grains per row. Corn sowing in the second season resulted in higher grain yield and the planting delay caused a reduction of 1.34 sc. day until the last sowing season. The productivity obtained at sowing in the second half of February was 28.6% higher than the last season, which corresponded to a loss of 43 sc. ha-1. It is concluded that a) sowing time influences the development and production of second crop maize, b) sowing in the second fortnight of February allows for further development of second crop maize, c) sowing of maize by the second fortnight of February provides for higher yields of second crop maize, d) The late sowing of second crop maize may prevent the cultivation of genotypes with high productive potential and high acquisition cost.