tóng-àn:Fertilizer applied to corn field.jpg

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English: View of nitrogen fertilizer being applied to growing corn (maize) in a contoured, no-tilled field in Hardin County, Iowa. Applying smaller amounts of nitrogen several times over the growing season rather than all at once at or before planting helps the plants use the nitrogen rather than have it enter adjacent streams (i.e. create nonpoint source pollution.)
Ji̍t-kî
Chhut-chhù U.S. Department of Agriculture, Natural Resources Conservation Service. Photo no. NRCSIA99241
Chok-chiá Lynn Betts
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(Bô siŏh-huòi sāi ciā ùng-giông)
Public domain This image is a work of the Natural Resources Conservation Service, part of the United States Department of Agriculture, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States.

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