Improved soil fertility, plant nutrition and grain yield of soybean and millet following maize intercropped with forage grasses and crotalaria in the Brazilian savanna
Lucélia de Cássia Rodrigues de Brito
A * , Henrique Antunes de Souza B , Raimundo Bezerra de Araújo Neto B , Diógenes Manoel Pedroza de Azevedo B , Edvaldo Sagrilo B , Renato Falconeres Vogado C , Suzane Pereira Carvalho D , Ane Caroline de Melo Ferreira E and Michel André Cavigelli F
+ Author Affiliations
- Author Affiliations
A Universidade Federal do Piauí, Teresina, PI, Brazil.
B Embrapa Meio-Norte, Teresina, PI, Brazil.
C Universidade Federal da Paraíba, Areia, PB, Brazil.
D Instituto Federal de Educação, Ciência e Tecnologia do Piauí, Teresina, PI, Brazil.
E Universidade Federal de Lavras, Lavras, MG, Brazil.
F USDA-ARS, Beltsville, MD, USA.
Crop & Pasture Science 74(5) 438-448 https://doi.org/10.1071/CP22251
Submitted: 19 July 2022 Accepted: 7 January 2023 Published: 3 February 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Intercropping maize with tropical forages is known to provide multiple benefits for the agricultural sustainability in the Brazilian savanna. Despite that, more studies are needed to define strategies to improve soil quality and increase crop yield of subsequent crops.
Aims: This study aimed to evaluate the impacts of cultivating maize in monoculture or in double- and triple-intercropping with brachiaria and crotalaria on the chemical and microbiological attributes of soil, nutritional status of soybean, and the productivity of soybean and millet in succession in the cerrado of eastern Maranhão.
Methods: The intercropping systems implemented in 2017 were as follows: maize (Zea mays) + Urochloa ruzizienses (brachiaria); maize + Crotalaria juncea (crotalaria); maize + brachiaria + crotalaria; and monoculture maize as a control. In 2018 and 2019, soybean and millet were cultivated on the same plots.
Key results: The triple-intercropping promoted immediate improvement in the biological and chemical attributes of the soil, especially when compared with monoculture maize. Intercropping maize with brachiaria, with or without crotalaria, increased soybean productivity by 21% and millet by 44% in the subsequent year, compared with monoculture maize system. Intercropping maize with brachiaria, with or without crotalaria, increased the leaf concentrations of nitrogen, potassium, magnesium, and sulfur of the subsequent soybean crop, suggesting improved nutrient cycling with intercropped forages.
Conclusions: Intercropping maize + forage, especially brachiaria, can be recommended for crop rotation and succession systems in the Brazilian savanna.
Implications: These results quantified the benefits of crop rotation following intercropping with maize and forage, which can be an alternative for farmers in the Brazilian savanna.
Keywords: Crotalaria juncea, Glycine max, Pennisetum glaucum, soil biology, soil fertility, tropical agriculture, Urochloa ruzizienses, Zea mays.
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