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Effect of Endogone Mycorrhiza on Phosphorus Uptake by Soybeans from Inorganic Phosphates¹

ABSTRACT

Seed yields of soybean (Glycine max L. Merr) mycorrhizal with Endogone were compared to yields from nonmycorrhizal plants in a P-deficient soil fertilized with various phosphate sources. Mycorrhizal outyielded nonmycorrhizal plants by 79, 530, 0, and 56% when fertilized with Al, Fe, rock, or monocalcium phosphate, respectively. Yields from mycorrhizal plants fertilized with Fe phosphate were and those fertilized with monocalcium or Al phosphate, respectively.

In a selective phosphate depletion experiment, mycorrhizal and nonmycorrhizal soybeans were grown in soil from Ap horizon of a Norfolk sandy loam with dilute acid extractable P contents of 70 to 162 ppm. Aluminum, Fe, Ca, and reductant soluble phosphates were determined in soil samples taken at planting and 10 and 23 weeks later. Soil planted to mycorrhizal soybean contained 5 and 8 µg of Al P/g of soil less than soil from nonmycorrhizal plots at the last two sampling dates, respectively. Mycorrhizal soybean plot soil contained 2.4 µg Fe P/g of soil less than nonmycorrhizal soil 23 weeks after planting. No differences were detected in Ca or reductant soluble phosphate fractions.

The increased P absorption by mycorrhizal soybean plants grown under P stress is principally from those phosphate sources most available under nonmycorrhizal conditions.

¹ Cooperative investigations of Plant Science Research Division, ARS, USDA, and the North Carolina Agr. Exp. Sta., Raleigh. Published with approval of the Director of Research as Journal Series Paper No. 3828. US Regional Soybean Laboratory Journal Series No. 756.

² Plant Pathologist, Agr. Res. Ser., US Dep. of Agr., Box 5397, Raleigh, North Carolina 27607, and Associate Professor, Dep. of Soil Science, North Carolina State Univ., respectively.

Received for publication July 24, 1972. Accepted for publication October 17, 1972.