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Soil Fertility, Root and Aboveground Growth of Black Oat Under Gypsum and Urea Rates in No Till

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Abstract

The residual effects of gypsum rates and the interaction with N -fertilization on soil fertility, black oat root growth and aboveground biomass yield under no till lacks information. This study evaluated soil chemical attributes up to 0.8 m depth and aboveground biomass of black oat in a continuous no-till area as affected by gypsum rates (0, 3, 6, 9 and 12 Mg ha−1) and topdressing N -fertilization (0, 50 and 100 kg ha−1) to a Typic Hapludox in Southern Brazil. Black oat root growth was also evaluated for two gypsum rates (0 and 6 Mg ha−1) and all N treatments. Gypsum application increased Ca2+ and SO42−-S fraction and reduced Mg2+ levels in all soil layers, and N -fertilization increased NO3 and NH4+ levels in the soil. Gypsum increased root length, superficial area and volume up to 0.8 m depth, while N-fertilization reduced root growth attributes in soil layers between 0.4 and 0.8 m depth. Gypsum increased (quadratically) the aboveground biomass yield of black oats in the two growing seasons, as did N-fertilization, but no interaction between gypsum and N -fertilization was observed. Gypsum can be used to improve soil fertility attributes, black oat biomass and root growth under no till. The higher N -fertilization (100 kg ha−1) increased black oat yield and reduced root growth in depth. In the average of the growing seasons, the gypsum rate of 7.36 Mg ha−1 applied 54 months earlier, associated with a rate of at least 50 kg ha−1 of N (urea) applied at the beginning of black oat tillering achieved the higher aboveground biomass yield.

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Funding

We acknowledge funding from Paraná State Araucária Foundation (Fundação Araucária - Brazil), Coordination for the Improvement of Higher Education Personnel (CAPES- Brazil) and from National Counsel of Technological and Scientific Development (CNPq- Brazil)—Grant No. 312024/2018-5.

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Correspondence to Renan Caldas Umburanas or Marcelo Marques Lopes Müller.

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The authors declare that they have no conflict of interest.

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Vicensi, M., Lopes, C., Koszalka, V. et al. Soil Fertility, Root and Aboveground Growth of Black Oat Under Gypsum and Urea Rates in No Till. J Soil Sci Plant Nutr 20, 1271–1286 (2020). https://doi.org/10.1007/s42729-020-00211-3

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  • DOI: https://doi.org/10.1007/s42729-020-00211-3

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