Differential Genotypic and Root Type Responses to Aluminum Toxic and Compacted Subsoil Layers Using Neutron Radiography

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Cornell University, January, 1997 - Corn - 302 pages
Neutron radiographic images of maize and soybean roots revealed that the tap, basal, and lateral root lengths of maize cv. CMS-36 were not significantly affected by Al-toxic Porter subsoil, illustrating their tolerance to the toxicity of this soil. Root elongation in the Al-toxic Porter subsoil suggests that, in the soybean line PI 416937, tap and lateral roots are Al-tolerant, and basal roots are only moderately Al-tolerant. Although basal roots of the maize cv. SA-3 and soybean cv. Davis were found to be Al-tolerant, tap and lateral root lengths were severely reduced in the Al-toxic subsoil. The subsoil compaction experiment demonstrated that taproots of maize SA-3 and soybean PI 416937 penetrated the compacted subsoil layer, while only basal roots of maize cv. La Posta and soybean cv. Weber penetrated the compacted layer. On the other hand, soybean cv. Perry moderately penetrated the compacted subsoil layer with both tap and basal roots.

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6
CHAPTER II
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