首页|Soybean crop incorporation in irrigated rice cultivation improves nitrogen availability, soil microbial diversity and activity, and growth of ryegrass
Soybean crop incorporation in irrigated rice cultivation improves nitrogen availability, soil microbial diversity and activity, and growth of ryegrass
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NSTL
Elsevier
Due to the genetic improvement of soybean cultivars more adapted to lowlands and to new drainage technologies, there has been a great insertion of soybean cultivation in rotation with irrigated rice in South America. Soybean has innumerable features beyond the fact that it is a legume, which can directly impact the microbial activity and diversity of the soil and the development of crops established in succession. Therefore, the objective was to evaluate nitrogen (N) dynamics, extracellular enzyme activity, soil microbial community, and the subsequent development of ryegrass in a Gleysol cultivated with irrigated rice and soybean in an area with a long history of irrigated rice cultivation. The experiment was conducted in the crop season 2015/16 at the Rice Research Station, Rio Grande do Sul, Southern Brazil, in an area that had been cultivated for 70 years with irrigated rice. The treatments used are irrigated rice cultivation and soybean in randomized blocks with 4 replicates. Hydrolysis of fluorescein diacetate, acid phosphatase, urease and beta-glucosidase were evaluated. Bacterial communities were estimated in soil by extracting DNA and sequencing the V3-V4 region of the 16S rRNA gene. Ryegrass dry biomass was quantified after irrigated rice and soybean. Greater mineral N availability (+ 49%), higher extracellular enzyme activity (+ 51%) and microbial diversity (+ 7%) were observed after soybean cultivation compared to irrigated rice. These changes, after soybean cultivation, had a direct impact on the development of ryegrass plants, which showed higher ryegrass dry biomass production. Thus, the adoption of soybean rotation in areas traditionally cultivated with irrigated rice is an important agronomic strategy to increase the sustainability of agriculture, since it allows the increase of soil quality and availability of nutrients in lowland crop production systems.
NSTL
Elsevier
