Recent Research on Tillage Systems Concerning Soil and Water Conservation, and Environmental Protection. 1. Effects of Tillage System on Soil Physical Properties.
2) Baeumer, K. and W. A. Bakermans. (1973). Zero-tillage. Advances in Agronomy. 25: 77 -123.
3) Blevins, R. L., Doyle Cook, S. H. Phillips. and R. E. Phillips. (1971). Influence of no-tillage on soil moisture. Agronomy Journal. 63: 593-596.
4) Blevins, R. L., G. W. Thomas. and P. L. Cornelius. (1977). Influence of no-tillage and nitrogen fertilization on certain soil properties after 5 years of continuous corn. Agronomy Journal. 69: 383-386.