Development of soybean genotypes as a function of water availability and sowing seasons in Rio Verde, state of Goias

Abstract

Soybean crop yield is affected in the absence of favorable conditions for its complete development, and one of the most limiting factors is the water availability throughout the crop cycle. Therefore, the objective of this study was to evaluate the behavior of three soybean genotypes, in two sowing dates, during two harvests, in the city of Rio Verde, Stat of Goiás. Four experiments were carried out in a randomized block design, with four replicates in the 2018/2019 and 2019/2020 harvests. The variables analyzed in the experiment were plant height at maturity, days to maturity, and grain yield. The water balance in the soil considered the water storage of 46.8 mm. It was observed periods with greater water deficiency (53.5 mm) in the 2018/2019 harvest for all genotypes. In short, for genotypes with 100 to 110 days of the cycle, the sowing time that showed to be the most promising to obtain higher yields, was between October 20 and November 20, for genotypes with a cycle of 120 days. This range of adaptation becomes broader, mainly because these genotypes have a longer vegetative period, being, therefore, the period of least water requirement for the crop.

Desempenho de plantas de soja em função da época de semeadura sob irrigação e sequeiro em Rio Verde, Goiás

“…Com a ausência de precipitação, a intensidade de radiação solar e a temperatura do ar são maiores, porém, os sistemas de irrigação amenizam ao menos a temperatura do solo, propiciando a melhores condições de desenvolvimento as culturas, questão essa muitas das vezes negligenciadas pelos agricultores. Na região em estudo, há uma incompatibilidade entre o término do vazio sanitário e início do período chuvoso, chegando há uma variação de até 40 dias, na média conforme Soares et al (2021). De acordo com os mesmos autores, o período seguro para cultivo de soja na região de Rio Verde em condições de sequeiro é de 20 de outubro a 20 de novembro para genótipos de ciclo de 120 dias, enquanto o vazio sanitário termina no dia 2 de setembro.…”

Climate changes and trends and impacts on grain production

“…occurring, on average, until november 20th Soares et al (2021),. evaluating several soybean genotypes and their performance depending on the availability of water stored in the soil, concluded that sowing the soybean crop (120 days) in a period with favorable water availability for the plant's performance during its cycle occurs in october 20th to november 20th in the Rio Verde region.…”