Use of supervised and unsupervised approaches to make zonal application maps for variable-rate application of crop growth regulators in commercial cotton fields

Table 8 Main parameters of the PCA-based approach of the supervised framework (SUF) for fields-dates to create the zonal application maps

Farm (Field)	Date/(mm/dd/YY)	DAE	Correlation	Bartlett's test (P-value)	Cumulative variance /%	Communality
1(A)	03/10/2023	35	0.77; 0.06	0.14	92	0.88; 0.89; 0.99
1(A)	03/23/2023	48	0.73; 0.05	0.13	90	0.87; 0.86; 0.99
2(B)	04/18/2023	86	0.86; –0.08	0.17	94	0.93; 0.93; 0.99
2(B)	05/03/2023	108	0.80; 0.30	0.15	93	0.90; 0.91; 0.99
3(C)	03/22/2023	40	0.93; 0.58	0.20	97	0.97; 0.96; 0.99
3(C)	05/11/2023	88	0.79; 0.31	0.16	93	0.90; 0.89; 0.99

DAE refers to days after emergence of the corresponding field data collection. Correlation refers to the correlation of plant height with other variables (NDVI and sand:clay) from the correlation matrix used as the basis for the PCA. Bartlett's test was used to determine the P value and respective suitability for PCA use. The cumulative variance refers to the proportion of variability explained by the first two PCs. Communality refers to each variable's (Height, NDVI, sand:clay, respectively) proportion of variability explained by the first two PCs

ISSN: 2523-3254