How to get the most of P fertilizer in alfalfa stands
| dc.contributor.author | Malhi, S.S. | |
| dc.contributor.author | Heier, K. | |
| dc.date.accessioned | 2018-09-10T19:08:24Z | |
| dc.date.available | 2018-09-10T19:08:24Z | |
| dc.date.issued | 1997-02-20 | |
| dc.description.abstract | Phosphorus (P) is relatively immobile in soil. Our previous research has shown that the majority of fertilizer P recovered in soil as extractable P remains in the top 5 cm layer, even after long-term annual applications of P to grass or alfalfa. This suggests that P fertilizer would be less effective when surface broadcast. For this reason, placement of P fertilizer is very critical; that is, it must be located where roots can intercept it. A field experiment was initiated in 1992 on the existing alfalfa stands on a P-deficient Black Chernozem (Typic Boroll) soil at Ponoka, Alberta, Canada to compare the effects of surface broadcasting versus subsurface banding (using a special disc drill) of annual and one-time initial applications of P on dry matter yield (DMY). The alfalfa was harvested for dry matter yield two times during growing seasons in 1992 to 1995. There was a marked increase in DMY from P applications in all the four years. Disc-banding at 15 cm spacing produced greater forage yield than surface-broadcasting, regardless whether P was applied annually (by 828 kg DMY/ha) or as single initial applications (by 565 kg DMY/ha). The P-use efficiency (averaged across P rates over a 4-year period) was greater with subsurface banding as compared to surface-broadcasting by 50 kg DMY/kg P/ha for annual applications and by 21 kg DMY/kg P/ha for single initial applications. | en_US |
| dc.description.version | Non-Peer Reviewed | |
| dc.identifier.uri | http://hdl.handle.net/10388/10243 | |
| dc.language.iso | en | en_US |
| dc.relation.ispartof | Soils and Crops Workshop | |
| dc.rights | Attribution-NonCommercial-NoDerivs 2.5 Canada | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.title | How to get the most of P fertilizer in alfalfa stands | en_US |
| dc.type | Presentation | en_US |