Go to the Material Editor. This scene will have four materials and the following will be the settings for each material.

Material #1: 2 Sided: Checked

Diffuse Color: Red: 15   Green: 80   Blue: 15

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Material #2: 2 Sided: Checked  

Diffuse Color: Red: 50   Green: 140   Blue: 50

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Material #3: 2 Sided: Checked

Diffuse Color: Red: 130   Green: 200   Blue: 20

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Material #4: Diffuse Color: Red: 80    Green: 50   Blue: 20

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Apply Material #1 to the first strand of grass Line01.

Apply Material #2 to the second strand of grass Line02.

Apply Material #3 to the third strand of grass Line03.

Apply Material #4 to the Ground object.

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