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Phosphorus and potassium balance in a corn–soybean rotation under no-till and chiseling

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Abstract

Nutrient use efficiency has become an important issue in agriculture, and crop rotations with deep vigorous rooted cover crops under no till may be an important tool in increasing nutrient conservation in agricultural systems. Ruzigrass (Brachiaria ruziziensis) has a vigorous, deep root system and may be effective in cycling P and K. The balance of P and K in cropping systems with crop rotations using ruzigrass, pearl millet (Pennisetum glaucum) and ruzigrass + castor bean (Ricinus communis), chiseled or not, was calculated down to 0.60 m in the soil profile for 2 years. The cash crops were corn in the first year and soybean in the second year. Crop rotations under no-till increased available P amounts in the soil–plant system from 80 to 100 %, and reduced K losses between 4 and 23 %. The benefits in nutrient balance promoted by crop rotations were higher in the second year and under without chiseling. Plant residues deposited on the soil surface in no-till systems contain considerable nutrient reserve and increase fertilizer use efficiency. However, P release from ruzigrass grown as a sole crop is not synchronized with soybean uptake rate, which may result in decreased yields.

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Acknowledgments

This research was funded by FAPESP (The State of São Paulo Research Foundation) and CNPq (The National Council for Scientific and Technological Development).

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Authors and Affiliations

  1. Department of Crop Science, College of Agricultural Sciences, São Paulo State University, Botucatu, SP, Brazil

    J. C. Calonego & C. A. Rosolem

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  1. J. C. Calonego
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  2. C. A. Rosolem
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Correspondence to C. A. Rosolem.

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Calonego, J.C., Rosolem, C.A. Phosphorus and potassium balance in a corn–soybean rotation under no-till and chiseling. Nutr Cycl Agroecosyst 96, 123–131 (2013). https://doi.org/10.1007/s10705-013-9581-x

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  • DOI: https://doi.org/10.1007/s10705-013-9581-x

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