Lugo-Mercado, H. M., J. Badillo-Feliciano, and F. H. Ortiz-Alvarado. “Effects of No Tillage and Various Tillage Methods on Yields of Maize, Field Beans and Pepper Grown on a Mollisol in Southern Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 68, no. 4 (October 1, 1984): 349–354. Accessed April 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7303.