Soil microbial biomass phosphorus as an indicator of phosphorus availability in a Gleyic Andosol(Soil Biology)

概要

論文の詳細を見る
The relationship between plant phosphorus (P) uptake and soil microbial biomass phosphorus (biomass P) or available phosphorus (Truog P) was estimated in a Gleyic Andosol in Sapporo, Hokkaido, in a 4-year field trial (2004-2007). Every year, the soil was treated in duplicate (each plot 36m^2) or triplicate (each plot 24m^2) with chemical fertilizer, cow manure compost or sewage sludge compost, and then kidney beans (Phaseolus vulgaris) were planted. Pooled data of the shoot content of P at harvest over the 4 years was significantly correlated with biomass P determined 1 month after the application of fertilizer (P<0.01). A multivariate analysis revealed that the grain yield was significantly positively correlated with the shoot content of P (P<0.01) and significantly negatively correlated with the shoot content of calcium (P<0.05), but not correlated with the shoot content of either nitrogen or potassium. These results suggest that P is the most limiting element to affect the productivity of kidney bean plants in this trial and that biomass P is an important P source that explains the differences in P availability among soil amendments. Biomass P is a better indicator of P availability for kidney beans grown in Gleyic Andosols compared with Truog P, which is widely used in Japan.
社団法人日本土壌肥料学会の論文