Evaluation of Sensor-Based Nitrogen Rates and Sources in Wheat

Table 6

Three cases illustrating topdress N rate recommendations prescribed by US-Canada-Mexico Algorithm and grain yield results obtained following the application of prescribed N rates.

Case	Site-year	Trt	Preplant N rate,; kg ha^−1	Topdress N rate,; kg ha^−1	Total N rate,; kg ha^−1	N rate difference,; kg ha^−1	yield,; kg ha^−1	Yield gain,; kg ha^−1
1	Conrad, 2012	2	220	78	298		6187 d	+1076
		6	90	30	120		7263 a
2	Conrad, 2011	6	90	11	101		2152 b	+672
		7	22	33	55		1480 e
3	Conrad, 2012	3	22	16	38	+98	6658 c	+605
		6	90	30	120		7263 a

followed by the same letter are not significantly different at , as determined by Duncan’s multiple range test.