Introduction

 North Florida has been traditional an area of agronomic crop

production. While there have been short cycles in acreage

devoted to other specific crops, the majority of the acreage has

remained agronomic.

 The low-energy-thrust program of the '70's speeded the

development of the no-till or minimum-till planting equipment and

technology that has been instrumental in reducing land prepara-

tion costs and increasing cash returns of both single- and

double-crop systems.

 The most successful agronomic double-crop system in the

 southeast has been fall planted wheat (primary-crop), harvested

 between 24 May and 1 June, followed by a soybean crop (double-

 crop) planted -around 12 June (Herzog et al., 1989, and Wright,

 1984). There are presently two major problems associated with

the production and sale of soybean. The first is the low world

price of soybean. Soybean .prices for the last six years have

been: 1984\$6.20, 1985\$5.20, 1986\$4.90, 1987\$5.55, 1988\$7.50,

and 1989\(estimated)$6.00 (based on USDA Fla. Agric. Statistics

Service, Field Crops, 1222 Woodward Street, Orlando, FL 32803).

The. second is that nematodes numbers build-up under a soybean

crop (Whitty, 1988), not only affecting the soybean yield, but

the yield of following crops that are susceptible to nematodes

(especially root knot).

 Nematode problems can be moderated using rotation crops with

 low host suitability. Two crops with low host suitability for

 nematodes are corn and sorghum, although host suitability varies
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