Abstract
Considering the hypothesis that soybean cultivars present different yield potential, even under ideal water conditions, this study aimed to identify highly productive soybean cultivars under optimal conditions of soil moisture management. Two experiments were conducted in the 2015/16 and 2016/17 crop seasons in Chapadão do Sul-MS, in a complete In a split-plot arrangement design with four replications. In the first experiment, the plots was composed of six water application frequencies (0, 1, 2, 3, 4, and 5 days); in the second experiment, the primary factor was constituted by six supplementary irrigation levels (0, 25, 50, 75, 100, and 125% of the Crop Evapotranspiration - ETc). In each experiment, subplots was composed of five soybean cultivars. The following variables were evaluated: plant height, insertion of the first pod, hundred grain weight, and grain yield. Regardless of the irrigation management used, soybean cultivars presented different agronomic performance.
Highlights
Since soybean’s domestication (Glycine max, (L.) Merrill.), its yield potential has been increasing each year
Considering the hypothesis that soybean cultivars present different yield potential, even under ideal water conditions, this study aimed to identify highly productive soybean cultivars under optimal conditions of soil moisture management
Subplots was composed of five soybean cultivars
Summary
Since soybean’s domestication (Glycine max, (L.) Merrill.), its yield potential has been increasing each year. With the need to double global food production by 2050 to meet the demand of the world population, soybean yields must increase at a rate of 2.4% per year (Zhou et al, 2015). The soybean crop increases at a rate of approximately 1.3% per year (FAO, 2018), confirming the need for new technologies to supply the world demand for this oilseed. The subtropical region of South America, which includes Brazil, Argentina, and Paraguay, has the world's largest soybean cultivation area, with more than 50 million hectares (FAO, 2018). In 40 years, the Brazilian soybean yield increased by approximately 170%. This value used to be 1250 kg ha-1 in 1977 but it reached 3364 kg ha-1 in 2017 (CONAB, 2018)
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