Comparisons




	Figure 1. Relationship between Combustion and NIRS for Determining N Content of Bentgrass (Plank, unpublished data. 1990)


	Table 1. Relationship between NIRS & Conventional Lab Methodology on the Nutrient Content of Bentgrass (Plank, unpublished data. 1990)

		Nutrient Means
		Conventional*	NIRS
Element	r value	ppm
P	-0.22	0.55	0.51
K	0.21	2.94	0.77
Ca	0.21	0.35	0.58
Mg	0.60	0.21	0.31
S	-0.05	0.55	0.30


	*S determined by combustion and other elements by plasma emission spectroscopy


	Table 2. Relationship between NIRS & Conventional Lab Methodology on the Micronutrient Content of Bentgrass (Plank,unpublished data. 1990)

		Nutrient Means
		Conventional*	NIRS
Element	r value	ppm
Mn	0.52	197	233
Fe	0.32	165	616
B	0.01	7	20
Cu	0.17	18	28
Zn	0.48	48	63


	* Elements determined by plasma emission spectroscopy


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