Abstract
ABSTRACT The need for crop rotation and profitability in lowland areas are the two main reasons for the introduction of soybean cultivation in the state of Rio Grande do Sul, Brazil. These areas have poor natural drainage, which impedes proper soybean growth. In this sense, this study aimed to assess the efficiency of using broad base ridges in comparison to the surface drainage for soybean cultivation in lowlands. The study was conducted during the 2014/2015 and 2015/2016 growing seasons in Sao Joao do Polesine, RS, Brazil. The assessed drainage methods were the use of broad base ridges with different width dimensions (22.5, 15.0, and 7.5 m) and surface drainage. The results showed that the shoot dry matter and leaf area index have similar behavior. The broad base ridge was better than the surface drainage method for these variables. The 7.5-m broad base ridge stood out among the treatments when compared to the others, as it had the best results for the leaf area index (8.66), plant height (102.5 cm), and shoot dry matter (33.06 g).
Highlights
Lowland areas in the state of Rio Grande do Sul, Brazil, which are traditionally used for irrigated rice cultivation
Thomas & Lange (2014) stated that soybean cultivation has presented a high growth in lowland areas due to two factors: the use of rice and soybean rotation as a tool for weed control and high remuneration that farmers have received for this oilseed
This optimism is perceived when observing the data from the Instituto Riograndense do Arroz (2019), which show that soybean cultivation in rotation with rice in lowland areas has been showing strong growth in the last growing seasons, with an area of 11,150 hectares in the 2009/10 season and 312,105 hectares in the 2018/19 season
Summary
Lowland areas in the state of Rio Grande do Sul, Brazil, which are traditionally used for irrigated rice cultivation. Thomas & Lange (2014) stated that soybean cultivation has presented a high growth in lowland areas due to two factors: the use of rice and soybean rotation as a tool for weed control and high remuneration that farmers have received for this oilseed. This optimism is perceived when observing the data from the Instituto Riograndense do Arroz (2019), which show that soybean cultivation in rotation with rice in lowland areas has been showing strong growth in the last growing seasons, with an area of 11,150 hectares in the 2009/10 season and 312,105 hectares in the 2018/19 season. According to Bamberg et al (2009), the main predominant soil class in lowland areas in the state of Rio Grande do Sul is the Planosol. Silva & Parfitt (2004) stated that only by improving surface drainage, it is possible to provide favorable conditions for the agricultural cultivations usual in highlands
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