Volume 13, Issue 3 (12-2022)                   2022, 13(3): 17-31 | Back to browse issues page

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Citrus and Subtropical Fruit Research Center, Horticultural Science Research Institute, Agricultural Research and Education Organization (AREO), Ramsar.
Abstract:   (599 Views)
The aim of this study was to evaluate the effects of three citrus rootstocks on some rhizospheric features including biological and chemical properties in a calcareous soil without and with phosphorus (P) addition. For this purpose, a factorial experiment was conducted in a completely randomized design with three replications. Experimental factors included Thomson Navel orange (Citrus sinensis L. Osbeck.) grafted on Sour orange (SO), Swingle citrumelo (SC), or Troyer citrange (TC) rootstocks and two levels of P fertilizer application [with (100 mg-P kg-1 soil) and without P addition]. Eighteen months after planting seedlings in pots, plants were harvested and rhizosphere soils were separated and some biological properties including dissolved organic carbon (DOC), the population of fungi and bacteria, microbial biomass P (MBP), alkaline phosphatase (AlP) and acid phosphatase (AcP) activities and available P (Olsen-P), and P fractions (including the exchangeable; associated with Fe and Al oxides; associated with Ca compounds; and residual) were determined in the rhizosphere soils. In both P levels, DOC and population of fungi and bacteria were higher in Sour orange rhizosphere soil than other rootstocks (p<0.05). However, the lowest values of pH, AlP and MBP were found in Sour orange rhizosphere soil compared with other rootstocks (p<0.05). Olsen-P was lower in Sour orange rhizosphere soil than other rootstocks. Additionally, the results showed that the depletion or accumulation pattern of various fractions was under the rootstock and P-level control. The amounts of exchangeable P and P associated with Fe and Al oxides in the rhizosphere soils had been only influenced by the root activity of citrus rootstocks and P addition (p<0.05). However, citrus rootstocks did not have significant effect on P associated with Ca compounds and residual P and these two forms of P had been solely influenced by P addition. Based on the results, among the rootstock SO could improve P acquisition efficiency mainly by modifying biological conditions and chemical reactions in its root surroundings soil and altering P fractions in its rhizosphere soil.
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Type of Study: Research | Subject: Root effects on soil properties and biophysical and biochemical processes
Received: 2022/06/21 | Accepted: 2022/12/1 | Published: 2022/12/1

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