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| Registros recuperados: 1.042 | |
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| Carter, David L.. |
| National concern about nitrate contamination of groundwater is raisin g many questions about the use of nitrogen fertilizer to grow high-quality crops. Some extremists are suggesting that commercial inorganic nitrogen fertilization should not be permitted. Such a limitation would seriously reduce crop productivity and farming profitability. We hope that it does not occur. However, the farming industry has become somewhat careless in nitrogen management because nitrogen fertilizer has been relatively cheap for the past couple of decades. Commonly, "a little extra nitrogen" has been applied to assure against a deficiency and less than maximum yield. in recent years. sugar beet growers have learned that such a practice can be costly because high... |
| Tipo: Article |
Palavras-chave: Practical farm efficiency; Mass Import - autoclassified (may be erroneous). |
| Ano: 1990 |
URL: http://eprints.nwisrl.ars.usda.gov/1228/1/698.pdf |
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| Sojka, R.E.. |
| This overview will be familiar to anyone who has visited the "PAM page" of the Northwest Irrigation and Soils Research Laboratory's web site. The reader is encouraged to visit that web site, <http://kimberlv.ars.usda.qov/ pampaqe.shtml>, for graphics and photos that were used in this NAICC presentation in Orlando in January, 2001, as well as for other more detailed technical information. PAM has been sold in the United States since 1995 for reducing irrigation-induced erosion and enhancing infiltration. Its soil stabilizing and flocculating properties have also substantially improved runoff water quality by reducing sediments, N, ortho and total P, COD, pesticides, weed seeds, and microorganisms in runoff. The first series of practical field... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Water-soluble PAM (WSPAM); Mass Import - autoclassified (may be erroneous). |
| Ano: 2002 |
URL: http://eprints.nwisrl.ars.usda.gov/1235/1/1075.pdf |
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| Registros recuperados: 1.042 | |
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