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© 2022. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The availability of water above compacted soil layer improves the performance of soybean (Glycine max (L.) Merr.) gas exchanges. However, studies do not address the responses of the photosynthetic process of soybean in compacted soil. The objective of this study was to evaluate the dynamics of gas exchange, growth and performance of soybean in compacted soil with poor irrigation. The experiment was conducted in a greenhouse with a completely randomized design in a 3 x 4 split plot for three soil densities (1.0 ± 0.013, 1.15 ± 0.022 and 1.30 ± 0.035 Mg m-3) and four daily water depths (4.0, 5.0, 6.0 and 7.0 mm d-1) with three replicates. Net photosynthesis rate (A), transpiration rate (E), stomatal conductance (gs), water use efficiency (WUE), instantaneous water use efficiency (iWUE), net assimilation rate, growth rate of shoot and root, relative growth rate of shoot and root, shoot biomass, root biomass at different layers (upper, compacted and lower), total root biomass and pod biomass were evaluated. The 4.0 and 5.0 mm d-1 water depths provided higher WUE and iWUE, but not soybean biomass accumulation; with these water depths and 1.15 Mg dm-3, gas exchange and accumulation of shoot biomass improved. From 45 to 65 d after emergence (DAE), shoot growth rate had a maximum peak at 7.0 mm d-1 in compacted soil. The growth rate and relative growth rate of soybean roots had smaller increases in biomass at 65 DAE. Daily water depths of 4.0 and 5.0 mm d-1 provided the best results in terms of WUE, however, it did not reflect an accumulation in soybean biomass. In these depths, soil compaction at 1.15 Mg m-3 provided an increase in gs, E, and A.

Details

Title
Gas exchanges and growth of soybean as affected by irrigation depths and soil compaction
Author
da Silva, Jodean Alves 1 ; de Carvalho, Luiz Gonsaga 1 ; Andrade, Fabrício Ribeiro 2 

 Universidade Federal de Lavras (UFLA), Departamento de Engenharia Agrícola, Lavras, Minas Gerais, Brasil 
 Instituto Federal de Educação, Ciencia e Tecnologia de Mato Grosso (IFMT), Juína, Mato Grosso, Brasil 
Pages
502-512
Section
RESEARCH
Publication year
2022
Publication date
Jul-Sep 2022
Publisher
Chilean Journal of Agricultural Research
ISSN
07185820
e-ISSN
07185839
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2705454598
Copyright
© 2022. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.