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Soil fertility and fine root distribution after gypsum application in Eucalyptus plantations with different tolerance to water deficit

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Abstract

Most Eucalyptus plantations in Brazil are located in regions with low fertility soils and seasonal droughts. The main objectives of the present study were to evaluate the fine root distribution of Eucalyptus along the soil profile and the vertical distribution of Ca, Mg, S, and K in the soil in response to dolomitic limestone and gypsum application under severe water deficit conditions. The experiment was designed in randomized blocks. Two clones of the hybrid Eucalyptus urograndis (one clone was tolerant to water deficit and one clone was susceptible to water deficit) were used under two crop conditions (with and without gypsum application). Fine root density (FRD) and root length density (RLD) decreased gradually along the soil profile. Gypsum application increased RLD in some soil layers in the tolerant clone. The Ca, Mg, and S-SO42− content of the soil increased in both clones. Both clones showed an increase in wood volume in response to gypsum application. The Ca, Mg, and S-SO42− content of the soil increased in both clones. Both clones showed an increase in wood volume in response to gypsum application. At 46 months after planting, the wood volume increased by 17% in the susceptible clone and by 24% in the tolerant clone. The use of soil conditioners, such as gypsum and limestone, is important to improve soil fertility and root distribution for both clones, especially in a prolonged drought season.

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Acknowledgements

The authors are grateful to Vallourec (forest unit) and Gustavo Castelo Branco and Helder Bolognani Andrade† for their assistance with site access and ongoing support. The authors also thank the CAPES for Ph.D. scholarship (No. 15226123). This research was funded by Vallourec (forest unit) and the Cooperative Program of Silviculture and Management of the Forestry Science and Research Institute (PTSM-IPEF).

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Correspondence to Yesid Alejandro Mariño Macana.

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Mariño Macana, Y.A., de Toledo, F.H.S.F., de Vicente Ferraz, A. et al. Soil fertility and fine root distribution after gypsum application in Eucalyptus plantations with different tolerance to water deficit. New Forests 51, 1039–1054 (2020). https://doi.org/10.1007/s11056-020-09773-7

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  • DOI: https://doi.org/10.1007/s11056-020-09773-7

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