Evaluation of Sensor-Based Nitrogen Rates and Sources in Wheat

Table 5

Preplant N rate, topdress N rate, topdress N source, total N rate applied, and spring wheat grain yield, Conrad and Corvallis, MT, 2013.

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	-	-	4304 ab	-	-	3430 a
2	91	311	4102 b	90	310	3968 a
3	54	76	4237 ab	90	112	3968 a
4	54	98	4304 ab	90	134	4035 a
5	54	121	4573 ab	137	204	3968 a
6	54	144	4708 ab	90	180	4035 a
7	54	76	4439 ab	137	159	3430 a
8	54	98	4506 ab	90	134	3430 a
9	54	121	4842 a	90	157	3430 a
10	104	194	4573 ab	137	227	3430 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.