Volume 23, Issue 2 (Summer 2019)                   jwss 2019, 23(2): 13-26 | Back to browse issues page

XML Persian Abstract Print

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

Shahrokh V, Khademi H, Shariatmadari H. Changes in Different Forms of Potassium and Clay Minerals in Soils as Influenced by Different Aged Orange Trees (Citrus sinensis) in Darab, Fars Province. jwss 2019; 23 (2) :13-26
URL: http://jstnar.iut.ac.ir/article-1-3506-en.html
1. Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran. , hkhademi@cc.iut.ac.ir
Abstract:   (5697 Views)
Despite the great importance of potassium applied as a fertilizer in the orange orchards, no information is currently available regarding the rate of potassium release from rhizosphere and the bulk soils of such trees. The objectives of this study were to investigate the weathering of micaceous minerals and their non-exchangeable K release and also, to examine the status of different forms of K in the rhizosphere and bulk soils of orange orchards with different ages in Darab, Fars Province. Samples were, accordingly, taken from the rhizosphere and bulk soils of orange orchards with the ages of 5, 10 and 20 years; also, virgin soils (control) were obtained from three soil depths including 0–30, 30–60, and 60–100 cm. Water soluble, exchangeable and nonexchangeable K, and the clay mineralogy of the soils were determined. The results demonstrated that the concentration of soluble and exchangeable K in the cultivated soils was less than that in the control soil and that the concentration of nonexchangeable K in the soils of 20-year-old orchards was less, than that in other soils. Soluble and exchangeable K values decreased with depth in all soils. Clay mineralogy investigation also showed that the quantity of illite decreased and that of smectite and illite-smectite increased as the age of orange trees was raised. With increasing the age of orange trees and root development, more potassium could be taken up from soil and more changes occurred in the soil minerals. In order to avoid a very high decline in the reserved K in the soils under orange trees, particularly in the orchards with older trees, K fertilization has to be taken more seriously based on the soil testing results.
Full-Text [PDF 334 kb]   (1552 Downloads)    
Type of Study: Research | Subject: Ggeneral
Received: 2017/05/6 | Accepted: 2018/01/30 | Published: 2019/09/1

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

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

© 2024 CC BY-NC 4.0 | JWSS - Isfahan University of Technology

Designed & Developed by : Yektaweb