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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Seed Phosphorus Effects on Rice Seedling Vigour in Soils Differing in Phosphorus Status
Agronomy, Vol.10(12), pp.1-10
07/12/2020
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Abstract
A key driver of the current unsustainable global phosphorus (P) cycle is the removal of P from fields in harvested grains. Minimising the concentration of P in grains of staple cereal crops would contribute towards addressing the issue, but it is possible that reducing grain P concentration may impact the vigour of subsequent seedlings. We used a hydroponic method to obtain low- and high-P rice (Oryza sativa L.) seeds from plants grown under near-identical conditions, so that any differences in subsequent seedling growth were likely due to differences in seed P concentrations rather than other seed quality differences that may arise from growing mother plants under different conditions. Seedling biomass production and P uptake were then investigated using high- and low-P seed of four rice genotypes in a P-rich soil and a P-deficient soil in a pot study in a glasshouse. In the P-rich soil, with a history of P fertilisation, with P fertiliser banded below seeds at sowing at 20 kg P ha−1 on a pot surface area basis, seedling biomass and P uptake were significantly affected by genotype (p < 0.05) but not by seed P concentration. In the P-deficient Ferralsol, main effects of seed P concentration, genotype and P fertiliser treatment (nil P, banded P fertiliser, broadcast and incorporated P fertiliser) on seedling biomass were all significant (p < 0.01) with, a significant genotype × P fertiliser treatment interaction. Overall, low-P seed produced less biomass than high-P seed (0.059 vs. 0.067 g plant−1) and nil P fertiliser (0.057 g plant−1) resulted in less biomass than banded P fertiliser and broadcast P fertiliser (0.064 and 0.068 g plant−1, respectively). When two genotypes were re-grown in the P-deficient Ferralsol with P fertiliser banded under the seed at 20 kg P ha−1 there was a significant effect of genotype on shoot biomass (p < 0.001) but only a trend towards lower seedling biomass with low P seed compared to high P seed (p = 0.128). Overall, the results suggest that seed P concentration does not affect seedling vigour when external soil P fertility is sufficiently high, but in P-deficient soils seedling biomass production and P uptake can be reduced by 10–20%. Further research is required to determine whether agronomic interventions including seed P priming or biological seed dressings can mitigate any impacts of lower seed P concentration on seedling vigour in P-deficient soils.
Details
- Title
- Seed Phosphorus Effects on Rice Seedling Vigour in Soils Differing in Phosphorus Status
- Creators
- Terry J. Rose - Southern Cross University, Southern Cross Plant ScienceCarolyn A. Raymond - Southern Cross University, Southern Cross Plant Science
- Publication Details
- Agronomy, Vol.10(12), pp.1-10
- Publisher
- MDPI AG
- Identifiers
- 991012963373502368
- Copyright
- ©2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
- Academic Unit
- Southern Cross Plant Science; Faculty of Science and Engineering; Science; Centre for Organics Research
- Language
- English
- Resource Type
- Journal article