Phosphate soil tests and their suitability to assess the phosphate status of soil
โ Scribed by Erik Sibbesen
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 469 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0022-5142
No coin nor oath required. For personal study only.
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## Abstract The chemical tissue test for phosphate using the Morgan reagent was examined. The time of extraction was very critical, the phosphate extracted being in linear relationship to time up to four hours. The first extraction (15 minutes) removed phosphate varying from 3 to 21% of the total
## Abstract A method was developed to test separately on crops the compounds formed when a granule of concentrated superphosphate hydrolyses in soil. An amount of monocalcium phosphate (MCP) equal to that in a granule of superphosphate was placed in a small glass tube with glass fibre filter paper
wns as follows : 1 ml. sniounta of the phosphnte standnrds were run into 13 mm. tubes, held firmly in n rnck on the reciprocating slinker ; 1 ml. of the molybdntc rengent, diluted to 5 ml. with wnter, \vns run into each tube nnd mixed by slinking for 15 sccs. 0.1 or 0.2 ml. stonnous oxnlnte wns then