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The Effect of Oxygen Diffusion Rate and Applied Fertilizer on the Growth, Yield, and Chemical Composition of Peas¹

ABSTRACT

The growth and nutrient uptake of pea plants were studied over a range of rates of oxygen supply and fertilizer levels. Oxygen diffusion rates, which varied from very low to those adequate for plant growth, as determined by platinum electrode techniques, were obtained by varying the depth of water table.

Three fertilizer rates were used to determine the extent to which fertilization might alleviate low oxygen supply. Nutrient uptake was measured by chemical analysis of roots and tops of the plants.

At very low oxygen diffusion rates, fertilizer had little effect on growth. Increasing the rate of O₂ diffusion from 15 x 10^-8 g. cm.^-2 min.^-1 to 72 x 10^-8 g. cm.^-2 min.^-1 increased growth and nutrient uptake. High and medium fertilizer rates partially but not completely reduced the effects of low oxygen supply.

¹ Authorized for publication by the Director as Journal Article No. 2344 of the Michigan Agr. Exp. Sta., East Lansing, in cooperation with Regional Technical Committee NC-17 "Soil Structure and Organic Matter." Submitted by the senior author to the College of Agriculture, Michigan State Univ., as partial fulfillment of the M.S. degree July, 1957. Presented before Div. I, Soil Sci. Soc. Amer., Lafayette, Ind., Aug. 4, 1958.

² Formerly Research Assistant, Michigan State University, now Assistant in Horticulture, Purdue University; Associate Professor of Soils, Michigan State University, respectively.

Received for publication October 23, 1958. Accepted for publication June 11, 1959.