Journal of Soil and Plant Interactions
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1- Shahid Bahonar University of Kerman
2- Shahid Bahonar University of Kerman ,mhejazi@uk.ac.ir
2- Shahid Bahonar University of Kerman ,
Abstract: (38 Views)
In calcareous soils of arid and semi-arid regions, knowledge of phosphorus (P) forms can be instrumental in optimizing the use of chemical fertilizers and reducing their detrimental effects on the environment. The aim of this study was to compare methods of surface and subsurface application of different levels of triple superphosphate and organic fertilizer (manure) on the forms of inorganic phosphorus in the subsurface layer (30–50 cm) of the soil. The research was conducted as a randomized complete block design in a factorial arrangement with three replications. The fertilizer treatments included four levels of triple superphosphate (0, 200, 400, and 600 kg/ha) combined with two levels of organic matter (0 and 30 ton/ha), which were applied at two depths—surface (0–20 cm) and subsurface (30–50 cm) for four years under field conditions. At the end of the fourth year of fertilization, soil samples were taken from the 30–50 cm depth. Inorganic phosphorus forms were determined using the sequential extraction method, and available phosphorus was measured by NaHCO3 extractor. The results showed that in both fertilizer application methods, with and without organic matter, the phosphorus fractions increased with increasing fertilizer levels. Application of 600 kg/ha triple superphosphate notably increased available phosphorus in fertilizer surface (41%) and subsurface (42%) application. The results also indicated that in the 30–50 cm soil layer, only subsurface application caused a significant increase in labile phosphorus forms, including water-extractable P (70.4%) and NaHCO3-extractable P (78.3%) compared to the control. In contrast, at this sampling depth, surface application of TSP led to an increase in moderately labile and non-labile P forms in the soil. The results of this study demonstrated that the fertilizer application method and knowledge of inorganic phosphorus fractions can provide a valuable tool for determining phosphorus availability for pistachio plants.
Keywords: Organic matter, P Availability, Pi fractionation, Saline calcareous soil, surface and sub-surface application.
Type of Article: Research |
Subject:
Availability of soil water and nutrients for plant
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
