Title

Does reducing seed-P concentrations affect seedling vigor and grain yield of rice?

Document Type

Article

Publication details

Pariasca-Tanaka, J, Vandamme, E, Mori, A, Segda, Z, Saito, K, Rose, TJ & Wissuwa, M 2015, 'Does reducing seed-P concentrations affect seedling vigor and grain yield of rice?', Plant and Soil.

Published version available from:

http://dx.doi.org/10.1007/s11104-015-2460-2

Peer Reviewed

Peer-Reviewed

Abstract

Aims

Phosphorus (P) removed in grains causes losses of P from fields each year. Reducing grain P may therefore improve the P efficiency of cropping systems. This study quantified impacts of reduced seed-P concentrations on rice seedling vigor and final yields and investigated whether this was influenced by soil P supply or genotype.

Methods

Seed batches with P concentrations ranging from 0.9 to 3.5 mg g−1 were produced by growing rice in field plots ranging from severely P-deficient to fully fertilized and used in glasshouse and field experiments to investigate effects on seedling vigor and final grain/straw yield.

Results

‘Genotype by seed-P concentration’ interactions were significant for seedling vigor but grain yield was generally not affected. This suggested some genotypes were sensitive to reduced seed-P concentration during the seedling stage while others with seed-P concentrations as low as 0.9 mg g−1 maintained rapid early vigor and high grain yield.

Conclusions

Results indicate it may be possible to reduce seed-P concentrations without having negative effects on seedling vigor or yield. The development of cultivars with reduced seed-P concentration, particularly if combined with rapid seedling root growth, could be a valid option to improve the sustainability of phosphate fertilizer use.