variable

denotation

Δyield

rice yield in early season or late season, unit: kg/mu, 1 mu = 1/15 ha or 0.06667 ha

T

T is technological variable for rice yield caused by seed, management and ect. Progress, 1991 is the based year

Δrain_i

Difference between current precipitation and average precipitation in the ith month, for example, there are 5 rainy days in January 1991, but there are 4 rainy days averagely in January from 1991 to 2012, then the Δrain_1 in 1991 is 1 (=5 - 4), unit: 0.1 mm

Δraintimes_i

Difference between current rainy days and average rainy days in the ith month

Δsunshine_i

Difference between current and average solar radiation duration in the ith month, unit: 0.1 hours/day

Δtemp_i

Difference between current and average temperature per day in the ith month, unit: 0.1 centigrade

Δlowtemp_i

Difference between current and average low temperature per day in the ith month, unit: 0.1 centigrade

Δwind_i

Difference between current and average wind speed per day in the ith month, unit: 0.1 m/s

Δwindtimes_i

Difference between current and average days when wind speed is over 20m/s in the ith month, unit: 0.1 m/s

i

January to December orderly with number 1, 2, …, 12 respectively; among the early season, i = 1 to 6; in late season for rice, the I is from 6 to 11

_Istation_1

Station = Danzhou

_Istation_2

Station = lingshui

_Istation_3

Station = qiongshan

_Istation_4

Station = qiongzhong