US 12,210,005 B2
Diagnostic method and system for drip irrigation cotton with nitrogen nutrient deficit
Ze Zhang, Shihezi (CN); Xiangyu Chen, Shihezi (CN); Xin Lv, Shihezi (CN); Qiang Zhang, Shihezi (CN); Lulu Ma, Shihezi (CN); and Yiru Ma, Shihezi (CN)
Appl. No. 17/782,134
Filed by Shihezi University, Shihezi (CN)
PCT Filed Dec. 21, 2021, PCT No. PCT/CN2021/140107
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2022/222522, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 202110425638.X (CN), filed on Apr. 20, 2021.
Prior Publication US 2024/0159725 A1, May 16, 2024
Int. Cl. G01N 21/55 (2014.01); G01N 33/00 (2006.01)
CPC G01N 33/0098 (2013.01) [G01N 21/55 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A diagnostic method for drip irrigation cotton with nitrogen nutrient deficit, wherein the diagnostic method comprises the following steps: determining sensitive leaf layer of cotton according to the growth stage of cotton; collecting spectral reflectance and biomass of each functional leaf in the sensitive leaf layer, calculating average spectral reflectance of the sensitive leaf layer and maximum leaf biomass; calculating optimized spectral index value according to the average spectral reflectance, calculating nitrogen concentration according to the optimized spectral index value; calculating critical nitrogen concentration according to the maximum leaf biomass; calculating nitrogen nutrition index of the cotton according to the nitrogen concentration and the critical nitrogen concentration, using the nitrogen nutrition index to characterize the abundance and deficiency of nitrogen nutrition in the cotton.