Humic and fulvic acid influence the morphophysiological and biochemical properties of cowpea (Vigna unguiculata) under water deficit

Author:

de Jesus Angela Lucena NascimentoORCID,Pierre de Andrada Lucas Vinícius,dos Santos Silva Luiz Filipe,Alves Santos Natália,Barbosa Cruz Fabiana,Amosse Cumbana Nerissa Carolina,Anchieta de Oliveira RafaelORCID,Souza Evaristo Jorge Oliveira deORCID

Abstract

Context Water deficit is a limiting factor in cowpea (Vigna unguiculata) performance. Humic and fulvic acids are organic fertilisers that increase plant productivity and appear as a viable alternative to improve cowpea productivity under water deficit. Aim We evaluated the efficiency of humic and fulvic acid on the morphophysiological and biochemical properties of cowpea subjected to water deficit. Methods The experiment was conducted in a greenhouse. A completely randomised design was adopted in a 5 × 2 factorial scheme with four replications, with five doses of humic and fulvic acid, 0, 4, 8, 12 and 16 mL/L applied to plants irrigated at 100% and 25% of field capacity. Stomatal conductance (gs), water potential (Pw), plant height (H), stem diameter (SD), number of leaves (NL), number of root nodules (NR), fresh and dry weight of the aerial (FMA and DMA) and root (FMR and DMR), total soluble proteins (SP) and total phenolic compounds (PC). Key results Doses of 8 and 12 mL/L increased gs (100–200 mmol m2 s−1), reduced Pw (−0.9 MPa) and NR, increased FMR and DMR (20 and 10 g), SP (8–9 g) in stressed and non-stressed individuals. Conclusions Intermediate doses of humic and fulvic acid (12 mL/L) are recommended for cowpea production in dry regions. Implications Humic and fulvic acid together are viable alternatives for optimising agricultural production and decision making in semi-arid regions.

Funder

Coordination for the Improvement of Higher Education Personnel

Foundation for the Support of Science and Technology of the State of Pernambuco

National Council for Scientific and Technological Development

Publisher

CSIRO Publishing

Subject

Plant Science,Agronomy and Crop Science

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