Soil strength properties as influenced by tillage under soybean

Abstract

The influence of commonly used tillage systems in Nigeria on soil strength, sealing and crusting is discussed. Soil penetrometer resistance data suggest that chiseling followed by disc harrowing offered a more conducive environment for root elongation and growth in the ecology under consideration. Field observation depicts the no-till system as having the highest potential for mechanical impedance, reduced root growth and limited proliferation and hence a high tendency for low crop yields. The results in general, demonstrated that sealing of soil surface due to raindrop impact can be minimized to some extent by tillage. A regression model for tillage treatments with indicator variables for crop development, soil compaction and time was also developed using field data. The models reveal the need to minimize soil compaction if positive crop performance is to be achieved. Using R2 values, the appropriateness of the model for predicting crop growth are in the order: Rotavation>Chiselling>Conventional>No-tillage. The findings have practical implications for soil and water conservation and crop performance.

Journal of Applied Science, Engineering and Technology Vol. 3(2) 2003: 17-22