**4. Abbreviation**

Tp:plant temperature. Tp10, Tp20, Tp30, Tp40 denotes rice stem temperature at plant heights of 10cm, 20cm, 30cm and 40cm, respectively.

ΔTp: plant temperature difference between water irrigated and non-irrigated.

Ta20, Ta40 and Ta: air temperature at heights of 20cm, 40cm and 150cm, respectively.

Tw: water temperature.

Tin: temperature of inflow water.

Tout: temperature of outflow water.

Tw-A: temperature difference between water temperature and air temperature at height of 150cm.

LAI: leaf area index.

DL: distance between the last upper two leaves of rice plant.

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