Florida Agricultural Experiment Station


 APPENDIX

 The following data has been gathered since Bulletin 134 was
written.
 OTHER MEANS OF CONTROLLING ROOT KNOT
 (See also page 128)

 SUMMER FALLOWING THE LAND
 Experiments show that a thoro fallow during one summer
will practically exterminate the worms in the soil.
 The land was deeply plowed and then cultivated at least
once each week and after each rain so as to prevent the growth
of absolutely any vegetation and to prevent the formation of a
crust which will keep the air out of the soil.
 In a small kitchen garden, chickens may be given the run of
the land while it is in fallow. They will add fertilizer to the
soil and help to maintain the dust mulch, but the cultivation of
the land must not be neglected.
 The fallowing should be started early, not later than July,
and kept up until the land is planted in the fall.
 SODIUM CYANIDE AND AMMONIUM SULPHATE
 Sodium cyanide at the rate of 600 pounds per acre is dis-
solved in water and sprinkled over the land. The soil is then
thoroly wet down with water to a depth of at least 18 inches.
Then ammonium sulphate at the rate of 900 pounds per acre is
applied in the same manner, and enough water again applied to
carry it down. This treatment is expensive and is justified only
on seed beds and high-priced trucking lands. The land may be
planted within a week after treatment. Sodium cyanide is very
poisonous and must be handled with great care.
 CARBON BISULPHIDE
 Valuable plants which have become infested with nematodes
 can be greatly benefited by a judicious application of carbon
 bisulphide. This is applied by punching holes to a depth of a
 foot or 18 inches about the bases of the plants. Into each hole
 an ounce of carbon bisulphide is poured, and the soil at once
 compacted over the hole so as to confine the gas. It is safer to
 treat only one side of the plant first, and the other side a week or
 two later.