Phosphorus Uptake from Soils by Corn Hybrids selected for High and Low Phosphorus Accumulation
1970
Baker, Dale E. | Jarrell, Ann E. | Marshall, Leon E. | Thomas, Walter I.
Field, greenhouse, and laboratory experiments were conducted over a period of 4 years to relate P accumulations in ear leaves of different corn hybrids and other plant responses to addition of P to soils and root morphology, including the length of the radicle, diameter of the radicle, and the number of seminal roots produced after 4 days in an incubator of high relative humidity at 28 C. In addition, experiments were conducted to determine the relationship of P accumulation in ear leaves and grain yields to P concentrations in seedling plants, seedling growth rate and P uptake from a zone 25 an (10 inches) below the soil surface. It was concluded that the concentration of P in seedling plants can be used to predict the availability of P in the soil. The concentrations of P accumulated in ear leaves by the different hybrids could not be explained on the basis of the P-absorption characteristics of their roots, but inherent differences among hybrids with respect to depth of rooting was suggested.
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