Study on Phosphorus Supply management of Poinsettia Grown in Peat-Based Substrate | ||
| Journal of Agricultural Science and Technology | ||
| Article 16, Volume 17, Issue 1, 2015, Pages 179-188 PDF (202.21 K) | ||
| Authors | ||
| A. Khandan-Mirkohi* 1; M. Schenk2; M. Fereshtian1 | ||
| 1Department of Horticultural Science, Faculty of Agricultural Science and Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Institute of Plant Nutrition, Leibniz Universität Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany | ||
| Abstract | ||
| Poinsettia as an ornamental pot plant is widely grown in peat-based substrates with high phosphorus (P) fertilization. The aim of current study was to evaluate the P demand of poinsettia according to its depletion ability during the growth stages by using a mechanistic simulation model. For this purpose, rooted poinsettia cuttings were grown in the medium with 80: 20 (V: V %) peat+ mineral component (generally is called as clay) and treated with different P levels of 0, 10, 35, 100, and 170 mg P [L substrate]-1. The yield and quality performance of the plants were evaluated thoroughly. Also, depletion of P around the root surface and the effect of buffering power on the depletion profile were assessed by means of mechanistic simulation model. The results showed that in peat-based substrates, P was transported to the root surface mainly by mass-flow. The simulation approach as well revealed that the well supplied plants cultivated in the peat-substrates needed a higher concentration gradient (30-50 µM) to drive the necessary flux and that the amount of plant available P (Cs) was limiting at later growth stages. The optimum yield and quality of poinsettia was obtained at the P application rate of 35 mg L-1 substrate, with Cs of 11-12 and 15-16 mg [L substrate]-1 at planting and 53 days after planting. It has been concluded that, to ensure a sufficiently high concentration gradient, P had to be supplemented by frequent fertigation at later growth stages but not at the early growing stage. | ||
| Keywords | ||
| Fertigation; Poinsettia; Phosphorus; Modeling; Uptake | ||
| References | ||
|
| ||
|
Statistics Article View: 143 PDF Download: 73 |
||
| Number of Journals | 45 |
| Number of Issues | 2,171 |
| Number of Articles | 24,674 |
| Article View | 24,462,669 |
| PDF Download | 17,560,524 |