Evaluation of Sensor-Based Nitrogen Rates and Sources in Wheat

Table 4

Preplant N rate, topdress N rate, topdress N source, total N rate applied, and spring wheat grain yield, Conrad and Corvallis, MT, 2012.

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	-	-	5851 d	-	-	3901 f
2	78	298	6187 d	110	330	6456 d
3	16	38	6658 c	124	146	6725 cd
4	16	60	6994 abc	124	168	6927 bcd
5	16	83	7061 abc	124	191	7465 ab
6	30	120	7263 a	124	214	6860 bcd
7	25	47	6658 c	124	146	7196 abcd
8	16	60	6725 bc	110	154	7398 abcd
9	21	88	6927 abc	124	191	7599 a
10	21	111	7129 ab	110	200	7667 a

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.