Patent ID: 11944048
Assignee: CHINA INSTITUTE OF WATER RESOURCES AND HYDROPOWER RESEARCH
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 7:
8. The decision-making method according to claim 7, wherein
in step S6, if the crop has entered the jointing stage, a method for performing the variable rate irrigation by using the ground-fixed canopy temperature sensors, the optimized airborne canopy temperature sensor network and the monitoring data obtained from the automatic weather station under the semi-arid climate conditions comprises:
A61: when the soil moisture content in one of the low-AWC management zone, the medium-AWC management zone and the high-AWC management zone reaches the set irrigation water lower limit, operating the irrigation sprinkler for a rotation at a 100% speed to obtain scattered point values of a canopy temperature of a field;
A62: determining a sampling time interval of the canopy temperature according to a requirement of a number of the scattered point values of the canopy temperature;
A63: based on the sampling time interval of the canopy temperature, taking the canopy temperature of a fixed point as a reference, and converting, by using a time scale conversion method, the scattered point values of the canopy temperature into canopy temperatures at a time when a daily maximum canopy temperature occurs;
A64: calculating a normalized relative canopy temperature NRCT based on the canopy temperatures obtained at the time when the daily maximum canopy temperature occurs after a time scale conversion;
A65: according to the normalized relative canopy temperature NRCT, generating an NRCT spatial distribution map by using an ordinary Kriging interpolation;
A66: dividing the field into a low-water deficit dynamic management zone, a medium-water deficit dynamic management zone and a high-water deficit dynamic management zone according to different ranges of the NRCT spatial distribution map; and
A67: calculating an irrigation water quota I1 in in each of the low-water deficit dynamic management zone, the medium-water deficit dynamic management zone and the high-water deficit dynamic management zone based on the normalized relative canopy temperature NRCT and a water requirement ETc of the crop in an interval between two irrigation times, and creating a prescription map for the variable rate irrigation; wherein
in step S6, if the crop has entered the jointing stage, a method for performing the variable rate irrigation by using the optimized soil moisture sensor network, the optimized airborne canopy temperature sensor network and the ground-fixed canopy temperature sensors under the semi-humid climate conditions comprises:
B61: when the soil moisture content in one of the low-AWC management zone, the medium-AWC management zone and the high-AWC management zone reaches the set irrigation water lower limit, operating the irrigation sprinkler for the rotation at the 100% speed to obtain the scattered point values of the canopy temperature of the field;
B62: determining the sampling time interval of the canopy temperature according to the requirement of the number of the scattered point values of the canopy temperature;
B63: based on the sampling time interval of the canopy temperature, taking the canopy temperature of the fixed point as the reference, and converting, by using the time scale conversion method, the scattered point values of the canopy temperature into the canopy temperatures at the time when the daily maximum canopy temperature occurs;
B64: calculating the normalized relative canopy temperature NRCT based on the canopy temperatures obtained after the time scale conversion;
B65: according to the normalized relative canopy temperature NRCT, generating the NRCT spatial distribution map by using the ordinary Kriging interpolation;
B66: dividing the field into the low-water deficit dynamic management zone, the medium-water deficit dynamic management zone and the high-water deficit dynamic management zone according to the different ranges of the NRCT spatial distribution map;
B67: setting a preliminary irrigation water quota I′;
B68: calculating a corrected irrigation water amount Im based on the preliminary irrigation water quota I′ and rainfall forecast information;
B69: calculating an irrigation water quota I2 in each of the low-water deficit dynamic management zone, the medium-water deficit dynamic management zone and the high-water deficit dynamic management zone based on the normalized relative canopy temperature NRCT and the corrected irrigation water amount Im, and creating the prescription map for the variable rate irrigation.