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The objective of this study was to investigate the plant re!>istance to water Oow (Rp) in alfaHa (Medicago sativa L.) under field conditions. Plant resisb\nce was computed using Ohm's law analog from leaf water potential (•h), transpiration rate (T), soil resistance (R.), and soil water potential (!f.). A pressure chamber was used to measure

An observed decrease in forest ET in July and August was clearly associated with low rainfall and increased soil water deficit. The OPEC system required only modest technical supervision. and generated a data yield of 99.5% over the period DOY 144-288. The documented verification and precision of this energy budget appears to be unmatched by any other long-term forest study reported to date.

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