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Canopy Resistance as Affected by Soil and Meteorological Factors in Potato

^a Agric. Eng. Dep., Menoufiya Univ., Menoufiya, Egypt
^b USDA-ARS Natl. Soil Tilth Lab., 2150 Pammel Drive, Ames, IA 50011

View larger version (25K): [in a new window]   Fig. 1. Potato leaf area index (LAI) and height changes during the winter and spring seasons.

View larger version (15K): [in a new window]   Fig. 2. Diurnal canopy resistance, rcp, for well-watered treatments for potato during full canopy cover in the winter and spring seasons. DOY, day of year.

View larger version (32K): [in a new window]   Fig. 3. Leaf–air temperature differences, Tl – Ta, at midday during the winter and spring seasons under well-watered conditions.

View larger version (17K): [in a new window]   Fig. 4. Ratio of actual leaf–air temperature under various soil water availability conditions relative to leaf–air temperature under well-watered conditions for potato in the winter and spring environments.

View larger version (25K): [in a new window]   Fig. 5. Potato canopy resistance, rc, during the winter and spring seasons at midday.

View larger version (14K): [in a new window]   Fig. 6. Potato canopy resistance, rcp, vs. net radiation, Rn, for the early growth stages for both winter and spring conditions. LAI, leaf area index.

View larger version (18K): [in a new window]   Fig. 7. Potato canopy resistance, rcp, vs. net radiation, Rn, for the complete ground cover phase of growth for both winter and spring conditions.

View larger version (16K): [in a new window]   Fig. 8. Potato canopy resistance, rcp, vs. net radiation, Rn, for the maturity phase of growth stages for both winter and spring conditions.

View larger version (18K): [in a new window]   Fig. 9. Changes in canopy resistance, rc, in relation to available soil water (ASW) during the winter and spring growing seasons. Rn, net radiation.

View larger version (14K): [in a new window]   Fig. 10. Canopy resistance normalized to the well-watered soil treatment during the winter and spring growing seasons. rc, actual canopy resistance; rcp, potential canopy resistance; ASW, available soil water.

View larger version (19K): [in a new window]   Fig. 11. Canopy resistance as affected by soil solution for full canopy cover conditions under winter and spring growing conditions. DOY, day of year; LAI, leaf area index; Rn = net radiation.

View larger version (16K): [in a new window]   Fig. 12. Normalized canopy resistance relative to well-watered treatments in relation to soil solution salinity (electrical conductivity, EC) for complete ground cover in winter and spring conditions. DOY, day of year; rc, actual canopy resistance; rcp, potential canopy resistance.