Validação do zoneamento agrícola de risco climático para soja no munícipio de Sebastião Leal, PI

Abstract

Soybean is an annual plant, cultivated throughout Brazil. Currently, a group of four states (Maranhão, Tocantins, Piauí and Bahia) called MATOPIBA has been highlighted in the expansion of this culture in the country mainly due to good productivity rates. Agricultural climate risk zoning (ZARC) seeks to identify the best sowing periods, as factors such as temperature, solar radiation and water availability directly affect productivity and vary during a year. The present work aimed to relate the planting date with the soybean crop productivity and verify the reliability of the recommendations (Zarc) in relation to the best sowing times in the municipality of Sebastião Leal-PI. It was also verified if the Zarc recommendations convey reliability regarding the best sowing times. The dates were divided into ten decends and analyzed in terms of productivity between the 2012/13 and 2020/21 harverts, The design was completely randomized, with nine treatments in nine agricultural years with different numbers of repetitions in the treatments, the descriptive statistics was performed,Assistant software 7.0. Ten-day period 04 had the best relative productivity and has one of the best yields in (kg.ha- ¹), decendes periods 03, 04, 05, 06 and 07 have their yields (kg.ha- ¹ and relative) at high and stable levels, and sowing is recommended at these times, despite showing good results in general, the “Zarc Plantation rigth” application does not show information with a high degree of reliability, since the information related to the month of January, where the application informs security levels high this study demonstrated low levels of productivity for the city of Sebastião Leal-PI