in relation to hybrid. Therefore a corn or sorghum crop in

rotation with a susceptible crop lowers the nematode numbers

available to feed upon the subsequent susceptible crops.

 Sorghum has shown varying potential in double-cropping

 (Sanford et al., 1986), but in Florida the use of sorghum as a

 double-crop in relation to a primary-crop has not been reported.

 The objective of this work was to compile information about

 specific yields of crops that could be used with wheat in a

 double-crop system or compared with other competitive single- or

 double-crop systems in North Florida.

 Materials and Methods

 The research was conducted at the North Florida Research and

 Education Center at Quincy, FL on a Norfolk sandy loam soil

 (fine-loamy, -siliceous, thermic, Typic Paleudult) and/or

 Marianna, FL on a Chipola loamy sand (loamy, siliceous, thermic

Arenic Paleudult).

 The experimental design for all crops was a randomized

 complete block with four replications.

 WHEAT: Florida 302 and 303 were planted from 25 Nov to 10 Dec

 from 1985 to 1988 at a planting rate of 1.5 to 2 bu/A. The

 initial fertilization occurred one day prior to planting when 500

 lb of 5-10-15 (N-P-K) was applied to the seedbed. Urea (46-0-0)

 was applied according to fertilizer test from 22 Jan to 7 Feb

 each year at approx. 50 lb N/A. All K was applied preplant.

 Weeds were controlled according to species and number present in

 relation to standard extension recommendations. Wheat yields

 were corrected to 12% moisture.