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RESEARCH ARTICLE

Effects of multi-growth stage water deficit and orthosilicic acid fertiliser on lodging resistance of rice cultivars

Solomon O. Olagunju https://orcid.org/0000-0001-7429-5030 A * , Muftau O. Atayese B , Olalekan S. Sakariyawo B and Enoch O. Dare C
+ Author Affiliations
- Author Affiliations

A Department of Crop Production, College of Agricultural Sciences, Olabisi Onabanjo University, P.M.B. 0012, Ayetoro Campus, Ayetoro, Ogun State, Nigeria.

B Department of Plant Physiology and Crop Production, Federal University of Agriculture, Abeokuta (FUNAAB), P.M.B. 2240, Alabata, Ogun State, Nigeria.

C Department of Chemistry, Federal University of Agriculture, Abeokuta (FUNAAB), P.M.B. 2240, Alabata, Ogun State, Nigeria.


Handling Editor: Caixian Tang

Crop & Pasture Science 73(4) 370-389 https://doi.org/10.1071/CP21563
Submitted: 12 April 2021  Accepted: 19 November 2021   Published: 28 February 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Lodging and water deficit (WD) are both yield limiting factors for rice production in Africa. A number of New Rice for Africa (NERICA) cultivars with drought adaptive and high yielding ability have been released but the extent of their lodging susceptibility due to water deficit is unclear. Application of orthosilicic acid (OSA) fertiliser can reduce lodging due to water deficit. An experiment was therefore conducted involving six cultivars (NERICAs 1, 4, 6, 7, 8 and Moroberekan), subjected to five multi-growth stage WD treatments: non-stressed (Nst), 10-day stress at each of any two stages of vegetative (Veg), reproductive (Rep) and grain filling (Grain) stages viz (Veg10 + Rep10), (Veg10 + Grain10), (Rep10 + Grain10), and 7-day stress at each stage (Veg7 + Rep7 + Grain7) and with/without 500 mL ha−1 of OSA fertiliser. Lodging traits (LTs) such as lumen diameter, bending moment, panicle weight (PW) and grain yield (GY) were increased by OSA fertiliser. Under Veg7 + Rep7 + Grain7 stress, OSA fertiliser increased rice vigour through increases in internode length, lumen diameters and cross-section modulus by 7%, 18% and 18%, respectively, while under Veg10 + Rep10 stress, culm wall thickness was increased by 20%. Veg10 + Rep10 stress caused the most significant reduction in all LTs but with lowest lodging index (LI, 0.32) attributed to reduced PW and GY. Among the cultivars, Moroberekan combined higher GY with average LI (0.40) across the stress conditions while NERICA 1 had the lowest LI (0.34) attributed mainly to its short height. Although water deficit caused a reduction in lodging resistant traits, resistance to lodging under Veg10 + Rep10 and Veg7 + Rep7 + Grain7 stresses can be enhanced with OSA fertiliser.

Keywords: bending stress, grain yield, growth stages, lodging, NERICAs, silicon fertiliser, stem thickness, vegetative biomass.


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