Name of experiment; Secondary evaluation of preemergence herbicides in
 sugarcane on sand soil (692-47-64)

 Location: H. Clayton McDonald Farms, Immokalee

 Soil: Sand

 Design: Randomized complete block with 3 replications. Plots
 were 4 rows wide (20 ft) by 43.5 ft long.

 Description of crop: The variety C.P. 50-28 was beginning to emerge at time
 of installation. The entire experimental area, sugar-
 cane and weed vegetation was sprayed topically with paraquat at the rate of
 1/2 lb. cation per acre to kill emerged weed vegetation. All emerged cane
 shoots were killed.

 Description of weed population: Major grass weeds were: bermudagrass, crab-
 grass and goosegrass. The principal broadleaf weeds
were: dog fennel, Commelina, purslane, cudweed, ground cherry and Dichondra.
These weed species were present as small seedlings prior to the paraquat
treatment. The same species continued to germinate after paraquat treatment.
Volunteer Sesbania became an important late-spring and summer infestant.

Description of herbicidal treatments: The herbicides are listed according to
 accepted common name or code designation in the data
tables. Application rates are given as active ingredient or acid equivalent
per sprayed acre. Chemicals were applied with an experimental small-plot
tractor herbicide unit in 60 gpa water carrier. Encap petroleum mulch was
applied in a 2- ft band, centered on the cane drill, after herbicide appli-
cation using hand-carried, CO2 powered spray equipment. The Encap rate was
250 gpa.

Application data: Date- 4 March 1964, 0620-0730 PM
 Sky- sundown
 Wind- SSE 4 mph
 Spray water- PH 7, hardness 300 ppm

 Date- 5 March 1964, 0610-1005 AM (0100-0300 PM for Encap)
 Sky- bright sun
 Wind- S 0-8 mph
 Spray water- pH 7, hardness 300 ppm

 Surface soil moisture 6 March 1964
 Drill; shallow (0-3/8 inch) = 0.6%
 deep (3/8-1 inch) 1.8
 Middles; shallow(0-3/8 inch)= 0.3
 deep (3/8-1 inch) = 1.1