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The Mechanism of Ammonium Phosphate Injury to Seeds¹

ABSTRACT

Cotton and wheat seeds were soaked in various salt solutions (including ammonium phosphates). The seeds were then allowed to germinate. With increasing salt concentration, the germination of cotton did not decrease, whereas the germination of wheat decreased in most cases. Soaking cotton seeds in 0.25M (NH₄)₂SO₄ solutions adjusted to pH levels between 7.2 and 9.0 showed germination injury above pH 7.8. The harmful effect of diammonium phosphate treatment was largely alleviated by subsequent soaking of seeds in dilute solutions of MgSO₄. Germination injury from (NH₄)₂HPO₄ appeared to be largely due to the inactivation of Mg in seeds.

¹ Contribution from Department of Agronomy and Soils, Agr. Exp. Sta., Auburn University, Auburn, Alabama, in cooperation with the Div. of Agr. Relations, TVA. Presented before Div. S-4, Soil Science Society of America, Nov. 21, 1963, Denver, Colo.

² Professors and NDEA Fellow, respectively.

Received for publication September 14, 1964. Accepted for publication December 28, 1964.