Abstract
Ultisols and Inceptisols were used to investigate the adsorption-desorption capacity of P and the effect of organic matter on the dynamics of P availability in tropical acid soils. The experiment consisted of two sub-experiments. Sub-experiment I was to study the adsorption-desorption capacity of Ultisols, Fresh-water lowland Inceptisols, and tidal-swamp Inceptisols. Therefore, surface soils (0 to 30 cm) of each tested soil were treated with 0, 10, 20, 30, 40, 60, 80, 100, 120, 140, 170, and 200 mg P kg-1 of soil. Sub-experiment II was to study the effects of organic matter application (0, 5, 10, and 15 Mg ha-1) on the dynamics of available P following 60d incubation under room temperature. P fertilizer application significantly affected water soluble-P (WSP) (p<0.01) and soil available P-Bray and Kurtz No. 1 (BKP) (p<0.01) in the three tested soils. The different response of both WSP and BKP confirmed that the soils tested in the current experiment had different soil P buffering capacity in the order of Tidal-lowland Inceptisol>Upland Ultisol>fresh-water Lowland Inceptisol. OM application increased the BKP in all tested soils as compared to the control. Differences in pattern of soil available P dynamics over time were detected between upland soil and two lowland soils used in the current experiment. Keywords: Adsorption-desorption, Inceptisols, organic matter, Ultisols
Highlights
The important role of arbuscular mycorrhizal (AM) fungi in the capture of nutrients from the soil of all ecosystems is wellknown
The results of this study indicated that the function of arbuscular mycorrhizal fungi (AMF) in supplying P was mainly derived from unavailable P in the soil
The population of arbuscular mycorrhizal fungi (AMF) on six soil sampling locations varied from 135 AMF spores per 100 g of soil until 497 spores per 100 g soil
Summary
The important role of arbuscular mycorrhizal (AM) fungi in the capture of nutrients from the soil of all ecosystems is wellknown. It is often neglected in the soil and crop management about the impact of AM fungi on fertilizer application quantitatively, especially phosphorus (P). Phosphorus is the second essential nutrient after nitrogen (N) and it is required for plant growth and found in soils in organic and complex inorganic forms. Due to its low solubility and mobility, plants cannot readily utilise P in an organic or complex inorganic form (Schachtman et al 1998). The function of AM fungi are to enhance the uptake of phosphorus from the soil, which is translocated to the host plant through hyphal networks in the soil (OwuzuBennoah and Wild 1980)
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