Sub-topic 1
2023 · National Preliminary
Free
Water storage efficiency: root-zone water retained versus irrigation water delivered
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Sub-topic 2
2023 · National Preliminary
Premium
Application efficiency: the ratio of water stored in the root zone to water delivered by irrigation
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Sub-topic 3
2023 · National Preliminary
Premium
Conjunctive use of water: simultaneous use of surface and groundwater for irrigation
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