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Published in Agron J 91:928-933 (1999)
© 1999 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Growth Analysis of Soybean under No-Tillage and Conventional Tillage Systems

Raji I. Yusufa, John C. Siemensa and Donald G. Bullocka

a Dep. of Agricultural Engineering, Univ. of Illinois, Urbana, IL 61801-4798 USA



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  		Fig. 1 Long-term (1961–1990) monthly total precipitation means and deviation from those means during 1993 and 1994 at Urbana, IL

 


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  		Fig. 2 Long-term (1961) monthly air temperature means and deviations from those means during 1993 and 1994 at Urbana, IL

 


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  		Fig. 3 Predicted function and observed 2-yr means of soybean total plant dry biomass (1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 4 Predicted function and observed 2-yr means of soybean leaf dry biomass (1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 5 Predicted function and observed 2-yr means of soybean stem dry biomass (1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 6 Predicted function and observed 2-yr means of soybean pod dry biomass (1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 7 Crop growth rate of soybean (mean over 2 yr, 1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 8 Predicted function and observed means of soybean leaf area index over 2 yr (1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 9 Predicted net assimilation rate (mean over 2 yr, 1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 10 Predicted specific leaf area (mean over 2 yr, 1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 


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  		Fig. 11 Predicted leaf weight ratio (mean over 2 yr, 1993 and 1994) with conventional tillage and no-tillage at Urbana, IL. Tests of significance conducted on predicted values. ***, **, *, and NS indicate significance at {alpha} = 0.01, 0.05, 0.10 and lack of significance at {alpha} = 0.10, respectively

 




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