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Review of Corn Yield Response under Winter Cover Cropping Systems Using Meta-Analytic Methods

Dep. of Crop Sciences, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801

View larger version (13K): [in a new window]   Fig. 1. Variance (vi) associated with each of the observations included in the meta-analysis against the natural logarithm of the response ratio [ln(yield of corn following winter cover crops/yield of corn following no cover)] (Li).

View larger version (15K): [in a new window]   Fig. 2. Natural logarithm of the response ratio [ln(yield of corn following winter cover crops/yield of corn following no cover)](Li) for biculture (10 observations), grass (68 observations) and legume (82 observations) winter cover crops. The horizontal bars are the variance.

View larger version (9K): [in a new window]   Fig. 3. Mean response ratio [yield of corn following winter cover crops/yield of corn following no cover (RR)] and 95% confidence interval (horizontal bars) for the three levels of winter cover crop (WCC).

View larger version (10K): [in a new window]   Fig. 4. Mean response ratio [yield of corn following winter cover crops/yield of corn following no cover (RR)] and 95% confidence interval (horizontal bars) for the three levels of nitrogen fertilizer rate (NFR) within legume.

View larger version (19K): [in a new window]   Fig. 5. Relationship between the response ratio [yield of corn following winter cover crops/yield of corn following no cover (RR)] and nitrogen fertilizer rate (NFR) for biculture, grass, and legume winter cover crops.

View larger version (12K): [in a new window]   Fig. 6. Response ratio [yield of corn following winter cover crops/yield of corn following no cover (RR)] and 95% confidence interval (horizontal bars) for the five levels of region. The regions are: eastern Canada (ECAN), North Central (NCE), Southeast (SE), Northeast (NE), and Northwest (NW).