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美国农场主们正处于一个历史上最严俊的时期。伴随着低水平的农田产出和日益增加的生产费用,少耕和免耕在玉米生产已得到交替使用。通过一个时期的观察,Purdue大学的农业经济学家 Steve Lovejoy 和 Jerald Fletcher 估计种植在伊利诺(Illinois)、印第安那(Indiana)和爱阿华(Iowa)三个州的玉米到1988年将近80％的面积处于少耕和免耕制度之中。他们的观察表明,从1978年到1983年免耕的面积由2％增加到6％。Steve Lovejoy 和 Jerald Fletcher 推测1988年18％的玉米面积将采用免耕技术。免耕有助于平衡增长的费用吗?在农场主们能回答这一问题之前,对这一问题已有了许
American farmers are in the strongest juncture in history. With the low level of farmland output and increasing production costs, less and no tillage has been used alternately in maize production. Through a period of observation, agricultural economists Steve Lovejoy and Jerald Fletcher of Purdue University estimated that corn grown in three states, Illinois, Indiana and Iowa, was nearly 80% by 1988 Of the area is in the system of less tillage and no-tillage. Their observations show that the area of no-till from 1978 to 1983 increased from 2% to 6%. Steve Lovejoy and Jerald Fletcher speculate that 18% of the maize area in 1988 would use no-till technology. Has no tillage helped to balance the cost of growth? Before farmers could answer this question, there was already a problem