@article{Bull:154900,
      recid = {154900},
      author = {Bull, Len and Sandretto, Carmen},
      title = {Crop Residue Management and Tillage System Trends. An  Econonomic Research Service Report},
      address = {1996-08},
      number = {1487-2016-122528},
      series = {SB 930},
      pages = {38},
      year = {1996},
      abstract = {Conservation tillage was used on more than 99 million  acres in 1994, about 35 percent of U.S. planted crop area.  Five years earlier, the total conservation-tilled acreage  was 72 million. Besides conserving soil, crop residue  management practices also cut production costs on many  farms. Advantages of crop residue management systems over  conventional systems include fuel and labor savings, lower  machinery investments, and long-term benefits to soil  structure and fertility.},
      url = {http://ageconsearch.umn.edu/record/154900},
      doi = {https://doi.org/10.22004/ag.econ.154900},
}