Evaluation of Sensor-Based Nitrogen Rates and Sources in Wheat

Table 3

Preplant N rate, topdress N rate, topdress N source, total N rate applied, and spring wheat grain yield, Conrad and Corvallis, MT, 2011.

Trt	Conrad			Corvallis
	Topdress N rate,; kg ha^−1	Total N rate applied,; kg ha^−1	Grain yield,; kg ha^−1	Topdress N rate,; kg ha^−1	Total N rate applied,; kg ha^−1	Grain yield,; kg ha^−1
1	-	-	942 f	-	-	2018 f
2	22	242	2690 a	24	244	3699 abc
3	22	44	1547 e	32	54	2757 d
4	22	66	1547 e	8	52	3430 bc
5	22	89	1883 cd	17	84	3833 abc
6	11	101	2152 b	24	114	3968 a
7	33	55	1480 e	32	54	3228 cd
8	22	66	1614 de	8	52	3497 abc
9	11	78	1950 bc	8	75	3363 bc
10	11	101	2152 b	17	107	3564 abc

fertilizer N will be applied as urea. fertilizer N rates were determined based on the NDVI values obtained using GreenSeeker, as prescribed by USA, Canada, Mexico Algorithm. Means within each column followed by the same letter are not significantly different at , as determined by Duncan’s multiple range test.