Results of Correcting Subsoil Problems

Gordon R. Tupper and M. Wayne Ebelhar


Subsoil problems such as high acidity or low fertility can be solved by a long term commitment to correcting the deficiency with the deep banding dry materials applicator. In experiment 1, a combination of subsoiling at a 45 angle to the drill plus 120 or 160 lb K20/A deep banded increased yield above all other treatments. Subsoiling annually increased yield over the control. Ripping without subsoiling did not increase yield. Ripping after subsoiling did not increase yield above subsoiling. In experiment 2, all nine potassium treatments increased yield over the check (no potassium). Deep banding 160 lb K2O/A further increased yield above all surface broadcast treatments (80, 120, and 160 lb K2O/A). In experiment 3, increasing nitrogen rates from 90 to 150 lb/A did not increase yield at the 0 and 60 lb K2O/A treatments, however, yields were increased by increasing nitrogen when either 120 or 180 lb K2O/A was applied annually. A combination of increasing potassium and increasing nitrogen was needed to maximize yields in this 5-year study.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences (no page number recorded)
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998