Kelling, K.A. and Peterson, A.E. and Walsh, L.M. (1977) A field study of the agricultural use of sewage sludge. 1. Effect on crop yield and uptake of N and P. rnal of Environmental Quality, 6 (4). pp. 339-345.
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Abstract
In field trials in Wisconsin, 0, 3.75, 7.5, 15, 30, or 60 t dry solids of anaerobically digested sewage sludge/ha was applied to (a) Warsaw sandy loams or (b) Plano silt loams in summer 1971, '72 and '73. Yields of rye sown directly after sludge application were increased on (b) by up to 7.5 t sludge/ha and on (a) by up to 15 t/ha compared with yields on untreated plots. Such yield increases were equivalent to application of 190 kg N + 183 kg P/ha on (b) and 380 kg N + 366 kg P/ha on (a). Occasional decreases in yield at the 1st harvest with 30 or 60 t sludge/ha were probably attributable to high contents of soluble salts in the sludge. Yields of sorghum X Sudan grass hybrid sown directly after sludge application increased from 1.93-2.33 t DM/ha with no sludge to 4.98-5.71 t with 7.5-30 t sludge/ha and declined to 4.27-4.33 t with 60 t sludge. Residual benefits from sludge application were evident in subsequent yields of maize grain and stover for at least 3 yr after application. N and P contents in plant tissue were increased with increasing rates of sludge. Av. total recovery by up to 4 successive crops was approx. 50% for available N and 7% for P at low sludge rates and approx. 14% for N and 3% for P at the highest rate
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Soil Science, Wisconsin University, Madison, WI 53706, USA |
| Subjects: | Plant Production Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 11 Oct 2012 11:02 |
| Last Modified: | 11 Oct 2012 11:02 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8391 |
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