Relationship of Soil Phosphorus Pools with Bray 1 Phosphorus in Some Acid Soils of Central Southern Cameroon

Autor: T. Tchienkoua, Wolfgang Zech
Rok vydání: 2010
Předmět:
Zdroj: Communications in Soil Science and Plant Analysis. 41:1327-1337
ISSN: 1532-2416
0010-3624
DOI: 10.1080/00103621003759338
Popis: We measured phosphorus (P) chemical pools of genetic horizons of five representative pedons from central southern Cameroon. Our objectives were to assess the relative abundance of P pools and to empirically model their interrelations and contributions to a P availability index. The fractionation scheme followed a modified Hedley sequential procedure with anion exchange resin, 0.5 M sodium bicarbonate (NaHCO3; Pi and Po), 0.1 M sodium hydroxide (NaOH; Pi and Po), 0.5 M hydrochloric acid (HCl; Pi), and 2 M sulfuric acid (H2SO4) after soil ignition at 550 oC. Resin P, sodium bicarbonate (NaHCO3-P; Pi and Po), and HCl-Pi–extractable pools accounted for 1.0, 5.7 and 0.7 % of total P (TP) respectively. The NaOH-P and residual P pools measured through 2 M H2SO4 emerged as the largest and most variable pools, accounting for 86.2% of TP. The relative abundance of extracted P pools decreased in the order resin P < NaHCO3-P ≤ HCl-P < NaOH-P < H2SO4-P. Bray 1 P was significantly correlated with all P pools except NaH...
Databáze: OpenAIRE