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 |