Phosphorus acquisition by barley (Hordeum vulgare L.) at suboptimal soil temperature

Authors

• Kari Ylivainio MTT Agrifood Research Finland
• Tommi Peltovuori

DOI: https://doi.org/10.23986/afsci.6389

Keywords:

Phosphorus fractionation, L-value, root growth, 33P fertilization

Abstract

We studied the effects of soil temperature (8 ºC and 15 ºC) on barley growth, barley phosphorus (P) uptake and soil P solubility. Barley was grown in a pot experiment in two soils with different P fertilization histories for 22 years. The availability of P was estimated by using ³³P-labeled fertilizer and calculating L-values. After cultivation for 22 years at ambient soil temperature without P fertilization (-P), soil L-value had decreased compared to soil that received annual P fertilization (P+). Low soil temperature further reduced the L-values, more in the -P soil than in the +P soil. Our results demonstrated that P fertilization can only partially ameliorate poor growth at low soil temperatures. Thus, applying ample fertilization to compensate for poor growth at low soil temperatures would increase the P content and solubility in the soil, but plant uptake would remain inhibited by cold.