Table 4.

Evaluation of counting accuracy of wheat spike grain

Wheat varieties	Nitrogen fertilizer treatment	Counting accuracy of method I				Counting accuracy of method II
		Mean absolute error	Mean relative error/%	RMSE	R2	Mean absolute error	Mean relative error/%	RMSE	R2
Bainong 307	N15	1.42	2.52	1.66	0.85	0.80	1.35	1.18	0.95
	N19	1.25	2.36	1.48	0.88	1.15	1.70	1.23	0.94
Xinmai 26	N15	1.75	3.25	2.16	0.84	1.20	2.17	1.26	0.92
	N19	1.20	2.29	1.55	0.87	1.10	2.16	1.32	0.93
Jimai 336	N15	1.80	3.59	2.19	0.81	1.40	2.88	1.73	0.89
	N19	1.75	3.47	2.31	0.82	1.23	2.26	1.74	0.91

The counting accuracy of Method II is higher than Method