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Table 2. Estimated monthly net irrigation requirements for selected crops in the Greeley, Colorado area, 1988
<br />[Values in inches of water; data from U.S. Department of Agriculture, Soil Conservation Service, 19881
<br />Table 3. Most common pesticides applied annually in the South Platte River Basin
<br />[Herbicide data for 1987 to 1989 from Gianessi and Puffer (1990); insecticide data for 1989 from
<br />Bohmont (199 1)
<br />Pesticides Active Ingredient in pounds
<br />Terbufos
<br />Chlorpyrifos
<br />Propargite
<br />Disulfoton
<br />Carbofuran
<br />Carbaryl
<br />Parathion -ethyl
<br />Phorate
<br />Dimethoate
<br />Diazinon
<br />2,4 -D
<br />EPTC
<br />Atrazine
<br />Alachlor
<br />Butylate
<br />Dicamba
<br />Cyanazine
<br />Metolachlor
<br />Picloram
<br />Cycloate
<br />Insecticides
<br />Herbicides
<br />298,000
<br />206,536
<br />166,000
<br />89,116
<br />46,494
<br />32,372
<br />32,250
<br />31,068
<br />27,454
<br />14,800
<br />568,965
<br />560,778
<br />547,625
<br />466,481
<br />317,674
<br />209,909
<br />152,884
<br />137,587
<br />44,493
<br />44,100
<br />DESCRIPTION OF THE SOUTH PLATTE RIVER BASIN 17
<br />Average
<br />Crop
<br />growing
<br />Days
<br />Jan.
<br />Feb.
<br />Mar.
<br />Apr.
<br />May
<br />June
<br />July
<br />Aug.
<br />Sept.
<br />Oct.
<br />Nov.
<br />Dec.
<br />Total
<br />season
<br />Alfalfa
<br />4/1 to
<br />193
<br />0
<br />0
<br />0
<br />1.1
<br />2.5
<br />4.9
<br />6.7
<br />5.7
<br />3.1
<br />0.4
<br />0
<br />0
<br />24.4
<br />10 /10
<br />Corn,
<br />4/30 to
<br />139
<br />0
<br />0
<br />0
<br />0
<br />0.2
<br />2.5
<br />6.0
<br />5.7
<br />1.3
<br />0
<br />0
<br />0
<br />15.7
<br />silage
<br />9/16
<br />Dry
<br />5/20 to 9/2
<br />105
<br />0
<br />0
<br />0
<br />0
<br />0
<br />3.1
<br />6.5
<br />4.7
<br />0
<br />0
<br />0
<br />0
<br />14.3
<br />beans
<br />Sugar
<br />4/7 to 10/7
<br />183
<br />0
<br />0
<br />0
<br />0
<br />0.7
<br />3.7
<br />7.0
<br />6.8
<br />3.7
<br />0.3
<br />0
<br />0
<br />22.2
<br />beets
<br />Table 3. Most common pesticides applied annually in the South Platte River Basin
<br />[Herbicide data for 1987 to 1989 from Gianessi and Puffer (1990); insecticide data for 1989 from
<br />Bohmont (199 1)
<br />Pesticides Active Ingredient in pounds
<br />Terbufos
<br />Chlorpyrifos
<br />Propargite
<br />Disulfoton
<br />Carbofuran
<br />Carbaryl
<br />Parathion -ethyl
<br />Phorate
<br />Dimethoate
<br />Diazinon
<br />2,4 -D
<br />EPTC
<br />Atrazine
<br />Alachlor
<br />Butylate
<br />Dicamba
<br />Cyanazine
<br />Metolachlor
<br />Picloram
<br />Cycloate
<br />Insecticides
<br />Herbicides
<br />298,000
<br />206,536
<br />166,000
<br />89,116
<br />46,494
<br />32,372
<br />32,250
<br />31,068
<br />27,454
<br />14,800
<br />568,965
<br />560,778
<br />547,625
<br />466,481
<br />317,674
<br />209,909
<br />152,884
<br />137,587
<br />44,493
<br />44,100
<br />DESCRIPTION OF THE SOUTH PLATTE RIVER BASIN 17
<br />
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