Optimum Seeding Rate for Spring Wheat in Northwest Minnesota

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Table 4. Means of the first versus the second planting date for grain yield by seeding rate for each year (1996-1998) and averages across years.

	1996		1997		1998		Average
Seeding Rate	pd1*	pd2*	pd1	pd2	pd1	pd2	pd1	pd2
seeds/ft²	bu per A
5.7	48.7	43.7	48.0	38.0	36.2	22.1	44.3	34.6
17.2	66.5	55.8	62.6	55.2	44.5	38.4	58.0	49.8
28.7	70.9	57.1	66.9	63.3	46.9	41.2	61.7	53.9
40.1	71.8	60.2	68.7	66.5	48.4	44.8	63.1	57.2
51.6	73.3	58.4	66.0	65.3	46.3	45.9	62.0	56.6
63.1	72.1	58.9	65.0	66.9	48.4	48.4	61.9	58.1

Constant†	43.8	40.6	43.1	31.6	33.9	18.5	40.2	30.2
b (linear)†	1.34	0.87	1.23	1.51	0.63	1.10	1.07	1.16
b (quad- ratic)†	-1.4x10^-2	-9.5x10^-2	-1.4x10^-3	-1.5x10^-3	6.7x10^-2	-1.0x10^-2	-1.2x10^-2	-1.2x10^-2
r	0.46	0.41	0.31	0.47	0.12	0.33	0.17	0.27

Optimum Seeding Rate (seeds/ft²)	46.4	45.9	42.9	48.7	47.0	53.8	45.0	49.1
Initial Plant Population (plants/ft²)	40.4	35.5	31.2	30.9	33.2	42.4	34.5	35.9

* pd1= first planting date; pd2 = second planting date.

† Only statistically significant results (P = 0.05) are reported.

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