Evaluation of soil moisture changes with the neutron method agreed closely with that obtained from the weighing lysimeters. Evapotranspiration can be determined with either method by the equation ET = P ‐ G ‐ Q ± Δ M where ET = evapotranspiration, P = precipitation, G = percolation, Q = surface runoff and ΔM = change in soil moisture. Differences were shown in the soil moisture extraction pattern under deep‐rooted and shallow‐rooted meadow crops. The hydrologic implications of this difference are discussed.
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McGuinness et al. (1961) studied this question.