Correction: Commercial crop yields reveal strengths and weaknesses for organic agriculture in the United States (PLoS ONE (2016) 11:8 (e0161673) DOI: 10.1371/journal.pone.0161673)

Abstract

There is an error in the seventh sentence of the Abstract. The correct sentence is: Averaged across all crops, organic yield averaged 67% of conventional yield. There is an error in the third sentence of the first paragraph of the Results and Discussion. The correct sentence is: Across all crops and all states, organic yield averaged 67% of conventional yield. There is an error in the first sentence of the second paragraph of the Results and Discussion. The correct sentence is: Organic crop yields were significantly less than conventional yields for 10 of 13 field and forage crops (Fig 1). There is an error in the first sentence of the fourth paragraph of the Results and Discussion. The correct sentence is: As a group, organic hay crops yielded similarly or significantly greater than conventional hay crops (Fig 1), though this was not true for the annual crop maize harvested for silage or haylage. There are errors in the third sentence of the fifth paragraph of the Comparison with Previous Analyses section in the Results and Discussion. The correct sentence is: For example, grapes and alfalfa are both perennial crops, but the organic yield ratios for these crops varied dramatically (50% and 100% of conventional yields, respectively). There are errors in the fourth sentence of the seventh paragraph of the Comparison with Previous Analyses section in the Results and Discussion. The correct sentence is: If the statistical significance is ignored and only the direction of the slope (increasing or decreasing) is considered, 16 out of 25 crops had negative slopes compared to 9 with positive slopes (Table 2). Fig 1 is incorrect. The authors have provided a corrected version here. Circles represent weighted ratio mean estimates, error bars represent 95% confidence limits for the weighted ratio; triangles represent the median crop yield ratio for all states included in the analysis. (Figure Presented). There is an error in Table 2. The values listed in the row 9 Haylage are incorrect. Please see the corrected Table 2 here. (Table Persented).