Date of Award
Master of Science
Corn (Zea mays L.) is the most valuable crop in the United States and is grown on more acres than any other harvested crop. Crop production in the United States centers in the north central states and has more than doubled in the last 30 years, rising from 2.1 to 5.5 billion bushels. In 1970, United States corn production accounted for 48% of the total world output (74).
Tillage is one of the oldest practices in the production of crops; it has been used by man since ancient times, Although rapid advances have been made during the last century, it is still far from an exact science, Farmers must still guess at the amount of tillage to employ for seedbed preparation and cultivation. The use of tillage tools has been and is still being governed largely by estimation based on past experiences (50).
Many of the principles of good tillage practice have been handed down from generation to generation and only over the past three decades have various sciences been applied to the practice of tillage. Thus, agronomists and agricultural engineers with the farmers have become more concerned about the complexity of the tillage process and knowledge of soil. They are seeking the needed physical manipulation of soil to increase production and decrease erosion.
Pablo O. Rangel
Rangel, Pablo O., "Effect of corn tillage system on physical properties of the soil and on bio-factors of plants" (1973). Graduate Theses and Dissertations. 16252.