| Autor: |
Hood, J. T., Ensminger, L. E. |
| Zdroj: |
Soil Science Society of America Journal; March 1964, Vol. 28 Issue: 2 p251-253, 3p |
| Abstrakt: |
Field and greenhouse studies with cotton and wheat showed that fertilizers containing ammonium phosphates were especially detrimental to germination and could result in very poor stands. In order to study the cause of this harmful effect, seeds were soaked in salt solutions (including ammonium phosphates) and acids for various time intervals. The seed surfaces were then washed free of the solutions and allowed to germinate. The (NH4)2HPO4solutions reduced germination more than any other salt solution including NH4H2PO4. In studies with cotton seed, a solution of (NH4)2SO4adjusted with NH4OH to pH 8.2 did not reduce germination as much as did (NH4)2HPO4. Germination was lowered more by H2SO4than by H3PO4at the same pH. Soaking the seed in salt solutions such as CaSO4before soaking in (NH4)2HPO4did not improve germination. When the seeds were soaked in MgSO4or MgCl2after being soaked in (NH4)2HPO4, there was an improvement in germination as compared with (NH4)2HPO4alone. Soaking in MgSO4and MgCl2did not increase the germination of seed that had been soaked in H3PO4. It appears that the detrimental effect of ammonium phosphate is not due to the ammonium or phosphate ion per se. |
| Databáze: |
Supplemental Index |
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