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Soil Fragment Size Distribution and Compactive Effort Effects on Maize Root Seedling Elongation in Moist Soil

^a CONICET and Dep. of Plant Production, Faculty of Agronomy, Univ. of Buenos Aires, (1417) Av. San Martín 4457, Buenos Aires, Argentina, and Nitragin Argentina S.A., Calle 10 y 11, Parque Industrial Pilar 1629, Pilar, Buenos Aires, Argentina
^b Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091
^c Dep. of Earth and Planetary Sciences, Univ. of Tennessee, Knoxville, TN 37996-1410

View larger version (34K): [in a new window]   Fig. 1. Interaction of compactive effort and (a) geometric mean diameter (GMD) or (b) log geometric standard deviation (LogGSD) on of a Maury silt loam. Bars are standard error of the least square mean.

View larger version (34K): [in a new window]   Fig. 2. Interaction of compactive effort and (a) geometric mean diameter (GMD) or (b) log geometric standard deviation (LogGSD) on relative bulk density of a Maury silt loam. Bars are standard error of the least square mean.

View larger version (33K): [in a new window]   Fig. 3. Interaction of compactive effort and (a) geometric mean diameter (GMD) or (b) log geometric standard deviation (LogGSD) on interfragment porosity of a Maury silt loam. Bars are standard error of the least square mean.

View larger version (30K): [in a new window]   Fig. 4. Interaction of compactive effort and (a) geometric mean diameter (GMD) or (b) log geometric standard deviation (LogGSD) on air-filled porosity of a Maury silt loam. Bars are standard error of the least square mean.

View larger version (28K): [in a new window]   Fig. 5. The effect of soil fragment geometric mean diameter on maize seedling root elongation parameters. Values are averaged over the four compactive efforts. Bars are standard error of the least square mean.

View larger version (27K): [in a new window]   Fig. 6. Compactive effort effect on maize seedling root elongation parameters. Values averaged over the four fragment geometric mean diameter treatments. Bars are standard error of the least square mean.

View larger version (28K): [in a new window]   Fig. 7. Compactive effort effect on maize seedling root elongation parameters. Values averaged over the three log geometric standard deviation treatments. Bars are standard error of the least square mean.

View larger version (22K): [in a new window]   Fig. 8. Bulk density, air-filled porosity, and relative bulk density effects on total root length density of maize seedlings growing in the 28 treatments (seven dry fragment size distribution treatments by four compactive effort treatments).