tóng-àn:Fertilizer applied to corn field.jpg
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| Soat-bêng |
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.) |
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| Ji̍t-kî | ||||
| Chhut-chhù | U.S. Department of Agriculture, Natural Resources Conservation Service. Photo no. NRCSIA99241 | |||
| Chok-chiá | Lynn Betts | |||
| 授權允准 (Bô siŏh-huòi sāi ciā ùng-giông) |
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| 日期/ 時間 | 細張圖 | 寸尺 | 用者 | 註解 | |
|---|---|---|---|---|---|
| 現在 | 2010年2月3日 (拜3) 06:47 | | 2,100 × 1,500（1 MB） | Smartse | adjust colours |
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