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Response of Phaseolus Vulgaris to Zine as Influenced by Phosphorus Level and Source¹

ABSTRACT

The percentage of fertilizer Zn which remained water soluble increased with increasing Zn additions until a Zn/P ratio of 1:29 was reached and then decreased with increasing quantities of ZnO incorporated in ammonium polyphosphate (APP). ZnO incorporated with ammonium orthophosphate (AOP) was less water soluble, in all cases, than the same quantity of ZnO incorporated into APP. Zn content of 3-week-old Phaseolus vulgaris L. (pea beans) was positively related to the water-soluble Zn present in the fertilizer. Yield and Zn uptake from field experiments with pea beans grown on calcareous soils indicated that APP is a more effective carrier than AOP in supplying Zn to the plant. With APP, a Zn/P ratio of 1:15 was inferior to ratios of 1:21 or 1:3 as measured by water-soluble Zn present, yield, and Zn uptake by pea beans.

¹ Michigan Agr. Exp. Sta., Journal Article no. 5302.

² Graduate Assistant, and Professor, Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing 48823. Senior author is now Assistant Professor, Dep. of Agronomy, Univ. of Tenn., Knoxville.

Received for publication March 15, 1971. Accepted for publication June 4, 1971.