Exercises: Evaluating Wind Erosion Problems with WEPS

South Carolina

Following are some example problems that we will use to evaluate some wind erosion problems in Marlboro and Charleston Counties, South Carolina.

Situation 1 -Two-year rotation developing into a four-year rotation

The scenario for the problem is:

•	The farm is located in Marlboro County, South Carolina

•	The CLIGEN station is McColl and the WINDGEN station is Florence Regional

•	The Soil Map Unit used in the evaluation is: NoA - Norfolk LS

•	The original two-year cropping system is Cotton and Watermelons

•	The field size is: x axis - 3500 ft.; y axis - 2000 ft.

•	Orientation of field operations and rows is -45 degrees

•	Operations are performed parallel to x axis

•	The early WEPS evaluations will be run for 5 rotation cycles

•	Barriers - Woods along the NW and NE field borders (trees w/leaves 4 rows)

Figure 1.21 shows a two-year rotation of Upland Cotton and Watermelons, including the dates and field operations.

*Cotton, Southeast (700 lbs. lint yield)

04/20/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

04/25/01 Lister - 40 inch row spacing (8 inch ridge height)

05/05/01 Planter double disk openers (40 inch row spacing) – Cotton, Southeast

05/25/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/10/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/27/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

09/15/01 Defoliate (Spray) crop

09/15/01 Harvest crop (leave stalks undisturbed)

11/01/01 Shred stalks

* Watermelons, direct seeded

11/15/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

03/01/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
03/15/02 Chisel plow - 2 inch wide straight pts.
03/20/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
04/04/02 Planter - double disk openers (30 inch row spacing) - Watermelon, direct seeded
05/05/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
05/20/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
07/10/02 Harvest crop (leave stalks undisturbed)

08/15/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

When we expand the two-year rotation to include Winter Wheat /Soybeans (double cropped), we can add the operations, dates of operation, and the crops Winter Wheat /Soybeans directly to the two-year rotation or we can build a separate template for winter wheat /soybeans (double cropped). The new template can then be inserted into the rotation. We recommend the option of building the separate template for Winter Wheat /Soybeans (double cropped); the template will then be available the next time you are building a rotation that includes this crop.

Figure 1.22) shows the three-year rotation of Picker Cotton, Watermelons, and Winter Wheat /Soybeans (double cropped), including the field operations and the dates they were performed.

*Cotton, Southeast (700 lbs. lint yield)

04/20/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

04/25/01 Lister - 40 inch row spacing (8 inch ridge height)

05/05/01 Planter double disk openers (40 inch row spacing) – Cotton, Southeast

05/25/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/10/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/27/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

09/15/01 Defoliate (Spray) crop

09/15/01 Harvest crop (leave stalks undisturbed)

11/01/01 Shred stalks

* Watermelons, direct seeded

11/15/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

03/01/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
03/15/02 Chisel plow - 2 inch wide straight pts.
03/20/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
04/04/02 Planter - double disk openers (30 inch row spacing) - Watermelon, direct seeded
05/05/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
05/20/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
07/10/02 Harvest crop (leave stalks undisturbed)

*Wheat, winter, soft white

10/25/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

11/14/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

11/15/02 Drill - double disk openers (8 inch row spacing) – wheat, winter, soft white

06/05/03 Harvest Small Grain (cutter bar)

06/06/03 Burn residue (approximately 800 lbs of residue/acre left on surface)

*Soybeans

06/07/03 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

06/08/03 Plant, double disk openers (30 inch row spacing) - soybean, MG V, 130 days

07/24/03 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)

08/10/03 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)

10/31/03 Harvest Soybeans (cutter bar)

11/20/03 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

Figure 1.23 shows the four-year rotation of Picker Cotton, Watermelons, Winter Wheat/Soybeans (double cropped); and 130-day Corn, including the field operations and the dates they were performed.

*Cotton, Southeast (700 lbs. lint yield)

04/20/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

04/25/01 Lister - 40 inch row spacing (8 inch ridge height)

05/05/01 Planter double disk openers (40 inch row spacing) – Cotton, Southeast

05/25/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/10/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/27/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

09/15/01 Defoliate (Spray) crop

09/15/01 Harvest crop (leave stalks undisturbed)

11/01/01 Shred stalks

* Watermelons, direct seeded

11/15/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

03/01/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
03/15/02 Chisel plow - 2 inch wide straight pts.
03/20/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
04/04/02 Planter - double disk openers (30 inch row spacing) - Watermelon, direct seeded
05/05/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
05/20/02 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
07/10/02 Harvest crop (leave stalks undisturbed)

*Wheat, winter, soft white

10/25/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

11/14/02 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

11/15/02 Drill - double disk openers (8 inch row spacing) – wheat, winter, soft white

06/05/03 Harvest Small Grain (cutter bar)

06/06/03 Burn residue (approximately 800 lbs of residue/acre left on surface)

*Soybeans

06/07/03 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

06/08/03 Plant, double disk openers (30 inch row spacing) - soybean, MG V, 130 days

07/24/03 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)

08/10/03 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)

10/31/03 Harvest Soybeans (cutter bar)

11/20/03 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

*Corn, 130 day
03/15/04 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
04/01/04 Plant, double disk openers (30 inch row spacing) - corn, grain, 130
05/01/04 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
05/21/04 Cultivator, row crop, 30 inch row spacing (3 inch ridge ht)
09/15/04 Harvest (cut or break stalks high)

10/15/04 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

Situation 2 - Continuous Tomatoes

This is another example problem that we will use to evaluate a wind erosion problem in Charleston County, South Carolina.

The scenario for the problem is:

•	The farm is located in Charleston County, South Carolina

•	The CLIGEN station is Charleston and the WINDGEN station is Charleston

•	The Soil Map Unit used in the evaluation is: NoA - Norfolk LS

•	The continuous cropping system is Tomatoes

•	The field size is: x axis - 2000 ft.; y axis - 1500 ft.

•	Orientation of field operations and rows is -45 degrees

•	Operations are performed parallel to x axis

•	The early WEPS evaluations will be run for 5 rotation cycles

•	Barriers - Woods along the NW and NE field borders (trees w/leaves 4 rows)

Figure 1.24 shows the one-year rotation of Tomatoes, including the dates and field operations.

*Tomatoes
02/15/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
03/01/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)
03/03/01 Lister - 48 inch row spacing (8 inch ridge height)
03/12/01 transplant - tomato, transplants
04/01/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)
04/15/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)
05/01/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)
06/15/01 Harvest crop (leave stalks undisturbed)
07/25/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

Situation 3 - Continuous Cotton

This is an example problem that we will use to evaluate a wind erosion problem in Marlboro County, South Carolina.

The scenario for the problem is:

•	The farm is located in Marlboro County, South Carolina

•	The Cligen station is McColl and the Windgen station is Florence

•	The Soil Map Unit used in the evaluation is: FaB - Faceville LS

•	The continuous cropping system is Cotton, picker

•	The field size is: x axis - 3500 ft.; y axis - 2000 ft.

•	Orientation of field operations and rows is -45 degrees

•	Operations are performed parallel to x axis

•	The early WEPS evaluations will be run for 5 rotation cycles

•	Barriers - Woods along the NW and NE field borders (trees w/leaves, 4 rows)

Figure 1.25 shows the one-year rotation of Picker Cotton, including the dates and field operations.

*Cotton, Southeast (700 lbs. lint yield)

04/20/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)

04/25/01 Lister - 40 inch row spacing (8 inch ridge height)

05/05/01 Planter double disk openers (40 inch row spacing) – Cotton, Southeast

05/25/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/10/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

06/27/01 Cultivator, row crop, 40 inch row spacing (3 inch ridge ht)

09/15/01 Defoliate (Spray) crop

09/15/01 Harvest crop (leave stalks undisturbed)

11/01/01 Shred stalks

11/15/01 Disk harrow, tandem, inline (18 inch dia blades, 9 inch spacing)