Doses de gesso agrícola no solo e sua correlação com a produtividade de soja em área inoculada ou não com Azospirillum brasilense

• Autor(a) principal: Moraes, Eduardo Leandro
• Data de Publicação: 2022
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/217526
• topic: Diazotrophic bacteria; Residual effect; Soil conditioner; Gypsum; Glycine max; Bactéria diazotróficas; Efeito residual; Condicionador do solo; Gessagem

The use of gypsum has become increasingly frequent in agricultural production systems, as it adds improvements in soil fertility, in the short term in more superficial layers and in the long term in deeper layers. Another technology that has gained space in agricultural systems is the use of growth-promoting bacteria, such as Azospirillum brasilense, in order to increase productivity and reduce costs. Therefore, the study aimed to evaluate the residual of gypsum doses (applied in November 2017), according to the methodology of Caires and Guimarães (2016), with 0;0,5;1,0; 1.5 and 2 times the recommended dosage, in areas inoculated or not by A. brasiliense, in the predecessor culture (black oat) on soybean yield in succession. The experiment was carried out in a Oxisol, in the municipality of Selvíria-MS, Brazil, with an experimental design of randomized blocks in a 5x2 factorial scheme, in the 2020/2021 harvest (40 months after plastering), in areas inoculated or not by A. brasiliense in grasses used in crop rotation since the installation of the long-term experiment. Macronutrient contents were analyzed in soybean leaves at the R1 stage, and at harvest the components of soybean production and productivity, and soil fertility in layers from 0 to 0.10 were evaluated; 0.10 to 0.20; 0.20 to 0.40 and 0.40 to 0.60 m. The inoculation of grasses that preceded soybean cultivation provided an increase of 16 bags of soybeans per hectare in relation to the non-inoculated areas. There was an improvement in soil fertility indicators, even after 40 months of plastering, with a positive effect on S contents from 0.10 m depth, Ca from 0.20 m depth, and SB and V% in the deepest layer of 0.40-0.60 m, demonstrating the conditioning effect of gypsum on the soil 40 months after its application.