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Response of upland rice varieties to drought stress

III. Estimating root system configuration from soil moisture data

Summary

Root density profile of three varieties grown along a toposequence under three soil moisture regimes was estimated from soil moisture depletion patterns in the soil profile. Each of the three varieties, IB 6, IR 1529-680-3 and IET 1444, had a different rooting pattern. The three soil moisture regimes corresponded to water table depths of 100 (M1), 30 (M2) and 15 cm (M3) below the soil surface. Soil moisture potential was negatively correlated with root density, and the differences in rate of moisture depletion at various depths were due largely to differences in root activity. However, varietal differences in root activity were observable only within a narrow range of soil moisture potential, generally above −0.60 bar.

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Mambani, B., Lal, R. Response of upland rice varieties to drought stress. Plant Soil 73, 95–104 (1983). https://doi.org/10.1007/BF02197759

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Key words

  • Hydraulic conductivity
  • Moisture extraction
  • Toposequence
  • Soil moisture regime
  • Soil moisture stress
  • Water table