Evaluating the Impact of Starter Fertilizer on Winter Canola Grown in Oklahoma

Table 1

Preplant composite soil sample results in Perkins and Lahoma, OK, in 2011 and 2012. Samples were collected in the summer, a month prior to planting.

Location	Year	pH	Buffer index	NO3-N		STP		STK		SO4-S	Ca	Mg
				0–15 cm	15–30 cm	0–15 cm	15–30 cm	0–15 cm	15–30 cm	0–15 cm	0–15 cm	0–15 cm
				ppm
Perkins	2011	4.5	6.6	27	—	76	—	406	—	31	717	175
Perkins	2012	4.5	6.3	4.5	—	122	—	436	—	—	—	—
Lahoma	2011	6.1	7.0	11	7	32	—	474	—	—	—	—
Lahoma	2012	6.0	7.0	21	—	40	—	470	—	38	3326	1140

pH: 1 : 1 soil : water.
NO₃-N: nitrate-nitrogen; 1 M KCl solution.
STP: soil test phosphorus; Mehlich III.
STK: soil test potassium; Mehlich III.
SO4-S: available sulfur; Mehlich III.
Ca: calcium; Mehlich III.
Mg: magnesium; Mehlich III.
— (dash): no data available.