Development and evaluation of the Pi soil test for plant‐available phosphorus
作者:
R. G. Menon,
S. H. Chien,
L. L. Hammond,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1990)
卷期:
Volume 21,
issue 13-16
页码: 1131-1150
ISSN:0010-3624
年代: 1990
DOI:10.1080/00103629009368295
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The Pi test is a new soil test for phosphorus (P), which uses a strip of iron oxide‐impregnated paper as a sink to adsorb P mobilized in a soil‐solution suspension. The paper strips are prepared by immersing hardened filter paper circles in a 10% solution of ferric chloride; then they are dried and exposed to ammonia vapor. The paper is then cut into strips 10 cm long and 2 cm wide. To extract P, 1 g of soil is shaken for 16 h with 40 mL 0.01MCaCl2and a Pi strip, which is enclosed in a nylon mesh bag. Phosphorus retained on the strip is dissolved in 0.1MH2SO4and measured. The amount of P extracted by the paper strips has been found to correlate well with yield and P uptake by maize(Zea MaysL., Var. Funk 5757) grown on acidic, alkaline, and calcareous soils and in soils fertilized with soluble fertilizers and phosphate rock.
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