2000 Precision Concept Research

SuperCal SO₄, versus Cal-SUL Broadcast on Soybeans

The Bottom Line

With treatment cost approximately the same, SuperCal SO₄ gave an economic yield advantage over Cal-SUL at both the 300 lbs/A and 500 lbs/A application rates. SuperCal SO₄ gave a 4.8 bu/A at 300 lbs/A and 8.3 bu/A at 500 lbs/A advantage over the control.

Statistics

The Duncan's multiple range test (DMRT) as shown on page 8, is used to determine if significant differences have occurred between treatments. This test indicates statistical separation between SuperCal SO₄ at both the 500 Ibs/A and 300 lbs/A as compared to the control.

DUNCAN'S MULTIPLE RANGE TEST (DMRT) -------------------------------------------------------------------------------- A statistical evaluation of the studies was conducted using the Duncan's Multiple Range Test (DMRT). The DMRT allows you to evaluate statistical differences between treatments and the probability that those differences are real and not due to chance. The ninety-five percent level of confidence was used. If treatments are significantly different, they will be followed by different letters (a, b, c). This means that ninety-five percent of the time, under similar parameters, these differences among treatments should occur.

2000 SuperCal SO₄ Soil Analysis Report¹

Organic Matter	Phosphorous		Potassium	Magnesium	Calcium	Soil pH
	P1	P2
3.07	30.4	53.1	195.5	402.6	19.18	6.2

Buffer Index	CEC	%K	%Mg	%Ca	%H
6.6	15.95	3.09	21.1	60.67	14.96

¹The soil analysis report is an average of fifteen 2.5 acre grid samples.

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