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Alfalfa Root and Shoot Mulching Effects on Soil Hydraulic Properties and Aggregation

Daniel P. Rasse, Alvin J.M. Smucker and Djail Santos

Crop and Soil Sciences Department, Plant and Soil Sciences Building, Michigan State University, East Lansing, MI 48824-1325 USA



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Fig. 1 Volumetric soil water contents in the Ap, Bt1, and Bt2 horizons of soils under bare fallow (open circle), bare fallow with alfalfa shoot mulch (open square), alfalfa with shoots removed and roots remaining (filled circle), and alfalfa with alfalfa shoot mulch (filled square), and daily rainfall measurements in 1995. Fisher's least significant differences (LSD0.05) represented

 


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Fig. 2 Volumetric soil water contents in the Ap, Bt1, and Bt2 horizons of soils under bare fallow (open circle), bare fallow with alfalfa shoot mulch (open square), alfalfa with shoots removed and roots remaining (filled circle), and alfalfa with alfalfa shoot mulch (filled square), and daily rainfall measurements in 1996. Fisher's least significant differences (LSD0.05) represented

 


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Fig. 3 Minirhizotron observations on 20 Sept. 1996 of fine root distribution patterns in soil profiles in alfalfa plots with shoots removed and roots remaining (filled circle) and with alfalfa shoot mulch applied (filled square) on 20 Sept. 1996. Standard errors given for

 


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Fig. 4 (A) Minirhizotron root counts and (B) root turnover rates in the upper 9.5 cm of alfalfa plots. Data from alfalfa with shoots removed and roots remaining and alfalfa with alfalfa shoot mulch were combined because no significant difference between treatments was observed. Standard errors given for

 


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Fig. 5 Regression of log Ksat vs. (A) macroporosity and (B) gravimetric porosity for the upper Ap horizon of plots under bare fallow (open circle), bare fallow with alfalfa shoot mulch (open square), alfalfa with shoots removed and roots remaining (closed circle), and alfalfa with alfalfa shoot mulch (closed square). *** Significant at P <= 0.001

 





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The Plant Genome
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