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