IX. WEED CONTROL IN LAWNS AND OTHER TURF AREAS 



The most effective method of weed control in lawns results from good 

 management techniques supplemented by improved methods of weed control. 

 Proper management and maintenance techniques include: (1) Adequate 

 fertilization based on fertility needs as established by a soil analysis; (2) 

 planting turf grasses best adapted to the soil and location; (3) mowing most 

 turf grasses to a height of 1-1/2 to 2-1/2 inches; (4) use of proper water- 

 ing practices (infrequent but thorough wetting of the soil); and (5) con- 

 trolling insects and diseases. A healthy vigorous lawn is the first step in 

 obtaining a weed-free lawn. 



Chemicals may be used to control weeds as part of any good lawn man- 

 agement program. The practices outlined herein are suggested as supple- 

 mental weed- control treatments. 



Table 1 may be used as a guide in mixing herbicides for use on home 

 lawns. The concentration of the herbicide as shown on the label of the 

 container of a liquid herbicide will usually fall within the range of con- 

 centrations shown in the first two columns of the table. The amount of an 

 herbicide required to mix a spray solution to treat at the rate of 1 pound 

 per acre is indicated in the last two columns of the table. 



Table 1. --Amount of herbicide per gallon of water required to spray 1,000 

 square feet at the rate of 1 pound of herbicide per acre. 1 







Amount of herbicide in 1 gal. of water 



Concentration shown on label 



required for treating 1,000 sq. ft. at 







the rate of 1 pound per acre 



Percent acid 



Pounds acid equiva- 



Ounces of 



Tablespoons of 



equivalent 



lent per gallon 



herbicide 



herbicide 



5 



0.5 



6.2 



12.5 



10 



1.0 



3.1 



6.2 



20 



2.0 



1.5 



3.1 



30 



3.0 



1.0 



2.1 



40 



4.0 



0.7 



1.5 



50 



5.0 



0.6 



1.2 



60 



6.0 



0.5 



1.0 



'To apply an herbicide at the rate of 1/2 pound per acre, use 1/2 the 

 amounts indicated; to apply 2 pounds per acre, double the amounts of 

 herbicide shown in the table. 



LAWN AND TURF SEEDBEDS PRIOR TO ESTABLISHMENT 



(1) For control of annual grasses and broadleaved weeds : A preplanting 

 treatment of calcium cyanamide. The chemical should be applied and 

 disked or raked and mixed into the upper 1/2- to 1-inch layer of soil at the 

 rate of 50 to 80 pounds per 1,000 square feet. Most effective results 

 usually are obtained by making a split application of the chemical. Apply 

 25 to 40 pounds per 1,000 square feet and rake it into the upper 1/2 to 1 

 inch of soil. Then, apply 25 to 40 pounds per 1,000 square feet on the soil 

 surface. Seeding of turf grasses must be delayed for 2 to 4 weeks until 



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