Volume 17, Issue 1 (2015)                   JAST 2015, 17(1): 179-188 | Back to browse issues page

XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Khandan-Mirkohi A, Schenk M, Fereshtian M. Study on Phosphorus Supply management of Poinsettia Grown in Peat-Based Substrate. JAST 2015; 17 (1) :179-188
URL: http://jast.modares.ac.ir/article-23-11549-en.html
1- Department of Horticultural Science, Faculty of Agricultural Science and Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2- Institute of Plant Nutrition, Leibniz Universität Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
Abstract:   (5953 Views)
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.
Full-Text [PDF 202 kb]   (7375 Downloads)    
Article Type: Research Paper | Subject: Horticultural Science
Received: 2013/03/30 | Accepted: 2014/04/27 | Published: 2015/01/1

Add your comments about this article : Your username or Email:
CAPTCHA

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.