Einfluß von Form und Plazierung der N- und P-Düngung auf Wurzelentwicklung, Phosphat-Aufnahme und Wachstum von Sonnenblumen (Helianthus annus) und Zuckerhirsen (Sorghum bicolor).
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| Title: | Einfluß von Form und Plazierung der N- und P-Düngung auf Wurzelentwicklung, Phosphat-Aufnahme und Wachstum von Sonnenblumen (Helianthus annus) und Zuckerhirsen (Sorghum bicolor). |
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| Alternate Title: | Influence of form and placement of N- and P-fertilisation on the root development, the P-uptake, and the growth of sunflower (Helianthus annuus) and sweet sorghum (Sorghum bicolor). |
| Authors: | Strasser, B.1, Werner, W.1 |
| Source: | Journal of Agronomy & Crop Science. Oct1995, Vol. 175 Issue 3, p157-165. 9p. 1 Diagram, 6 Graphs. |
| Subjects: | Phosphorus in agriculture, Nitrogen in agriculture, Plant roots, Plant development, Agronomy, Crop science |
| Abstract: | In pot- and rhizotrone-experiments with Sorghum bicolor and Helianthus annuus, a higher P-uptake was achieved by placement of diammonphosphate (DAP) than by either placement of triplesuperphosphate (TSP) or by broadcasting DAP or TSP, respectively. Dual placement of TSP and ammonia increased the P uptake but it was less effective than placement of DAP for sunflowers, but not for sweet sorghum. Placement of nitrogen resulted in a local root accumulation, where ammonia had a greater effect than nitrate for both of the species. Single placement of TSP had no effect on either P uptake or root development. Thus, the higher P uptake at DAP placement could be attributed to three main factors: the local root accumulation caused by the placement of nitrogen, a specific physiological ammonia-effect, and the lower binding intensity of the phosphate in the DAP-band compared with placed TSP (WERNER and STRASSER 1993). The improvement in spatial availability caused by the NH+4-induced root accumulation was of a greater importance for the P-uptake than was the improvement of chemical availability in the DAP-band. The better response of sunflowers in comparison with sweet sorghum was attributed to better acquisition ability in sweet sorghum. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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