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Effect of Soil Temperature and Soil Moisture on Manganese Absorption by Soybean Plants¹

ABSTRACT

Periodic field observations of the development of manganese deficiency symptoms in soybeans indicate that soil temperature and soil moisture may influence manganese absorption by soybean plants. These observations were explored in detail in a greenhouse study.

Glazed pots were filled with a manganese deficient clay soil, placed in constant temperature water baths and planted to soybeans. One bath was maintained at 15° C., a second at 27° C., while the third was maintained at 15° C. for the first 7 weeks of plant growth and increased to 27° C. for the remaining 5 weeks of growth. Two soil moisture levels were provided at each soil temperature.

A low soil temperature combined with high soil moisture was conductive to the development of severe foliar sympoms of manganese deficiency. High soil temperature combined with low soil moisture produced plants which exhibited only a slight manganese chlorosis. The total manganese per plant and the manganese concentration within the plant were significantly greater at the high than low soil temperature. In a solution culture study, increasing the temperature of the solution increased the manganese concentration in the soybean leaves indicating a physiological response of the plant to a change in root temperature.

¹ Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., Wooster, Ohio.

² Assistant Professor of Agronomy; Instructor, Ohio Agr. Exp. Sta., Wooster, Ohio. Acknowledgment is gratefully made to R. Rang for his assistance with greenhouse operations.