Rapid Identification of Potassium Nutrition Stress in Rice Based on Machine Vision and Object-Oriented Segmentation

Table 4

Selected feature subset of the different leaf positions under K deficiency.

Growth stage	Leaf position	Subset
Productive tillering stage	1^st leaf	2, 3, 4, 5, 6, 7, 8
	2^nd leaf	2, 3, 5, 6, 7, 8
	3^rd leaf	2, 5, 7, 8
Invalid tillering stage	1^st leaf	2, 3, 4, 5, 6, 7, 8
	2^nd leaf	2, 3, 5, 6, 7, 8
	3^rd leaf	2, 5, 7, 8
Jointing stage	1^st leaf	2, 3, 5, 6, 7, 8
	2^nd leaf	2, 5, 6, 7, 8
	3^rd leaf	2, 5, 7, 8
Booting stage	1^st leaf	2, 5, 6, 7, 8
	2^nd leaf	2, 5, 7, 8
	3^rd leaf	5, 7, 8
Universal characteristics		2, 5, 7, 8