Effect of heating on phosphate sorption and availability in some north‐east Nigerian soils

Kwari, J. D.; Batey, T.

doi:10.1111/j.1365-2389.1991.tb00416.x

Cited by 18 publications

(5 citation statements)

References 21 publications

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“…Kuo (1988) reported a significant correlation between X m and the recovery of added P over a wide range of soils. This is not surprising as P deficient soils with a large sorption capacity can retain large quantities of P. Similar to the results of this study, Kwari and Batey (1991) observed an apparent enhancement of the effect of fire on maximum sorption capacity in a field burn with ash addition versus static oven heating. They suggested that the additional increase in sorption capacity with ash addition was due to the replacement of hydroxyl ions by the phosphate added in the ash.…”

Section: Maximum Soil P Sorption Capacitysupporting

confidence: 79%

“…These changes in soil mineralogy may be related to changes in P dynamics observed by Romanya et al (1994), Kwari and Batey (1991) and Serrasolsas and Khanna (1995). However, it is not well understood how heat-induced changes in texture and mineralogical composition affect the total surface area of mineral soil particles (as an indicator of P sorption capacity), the maximum amount of P that can be held by the soil (P sorption capacity, X m ) and the strength with which this P is retained to the soil particles (affinity constant, K).…”

Section: Introductionmentioning

confidence: 99%

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Soil phosphorus availability after slash-and-burn fires of different intensities in rubber agroforests in Sumatra, Indonesia

Ketterings

Noordwijk

Bigham

2002

Agriculture, Ecosystems & Environment

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Land clearing fires in Sumatra, Indonesia, caused enormous environmental problems for southeast Asia in 1997, but rubber farmers as well as large rubber and oil palm plantation owners continued to slash-and-burn due to the lack of an alternative that is equally quick, cheap, and capable of improving soil fertility. A partial alternative may be found in the reduction of the fuel load before the burn by harvesting and selling a larger fraction of the wood and, thus, changing the intensity of the fire and reducing particulate and greenhouse gas emission. An adequate phosphorus (P) supply is critical to crop production in Sumatra. Thus, it is important to understand the effects of such a reduction in fire intensity on crop P availability. Field and laboratory experiments were conducted to: (1) determine P sorption capacities and affinity constants for a forest soil exposed to different fire intensities in a controlled oven experiment (heat effects only); (2) compare the sorption characteristics of oven-burned soil with field-burned soil (heat and ash addition effects); and (3) determine the effects of fire-induced changes in soil properties on indices of P availability. Sorption experiments using oven-heated forest soil showed an increase in both the maximum amount of P it can hold (P sorption capacity, X m ) and the strength with which this P is retained to soil particles (affinity constant, K) with heating to 450 • C. Field burning resulted in similar increases in X m but reduced the affinity constants in the surface 15 cm soil. The increase in X m was related to a fire-induced increase in specific surface area of the mineral fraction. The addition of ash in field burns appeared to be responsible for the observed decrease in K. The increase in X m is expected to enlarge the need for P fertilizers as soon as solution P declines to pre-burn levels. These mineralogy-based changes in P sorption characteristics of surface soil are expected to be long-term and could reduce the time period for sustained annual crop production, establishment of new rubber plantations from seeds, as well as affect soil loss and sustained rubber production. In managing the intensity of slash-and-burn fires, the farmer, thus, has to balance between short-term gains in P availability and long-term costs in increased P sorption.

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Section: Maximum Soil P Sorption Capacitysupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Soil phosphorus availability after slash-and-burn fires of different intensities in rubber agroforests in Sumatra, Indonesia

Ketterings

Noordwijk

Bigham

2002

Agriculture, Ecosystems & Environment

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“…A number of studies have reported an increase in available soil P after heating (Kang & Sajapongse 1980;Kitur& Frye 1983;Kwari & Batey 1991) or in soils collected after a forest fire (Dymess et al 1989;Marion et al 199 1;Romanya et al 1994). Different mechanisms have been suggested to explain Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Kutiel & Shaviv (1989), in laboratory incubations, found an increase in P availability after soil heating, but after a few weeks available P decreased to the original values. Different reasons have been assigned for the decrease in available P in the longer-term after fire, which include changes in the mechanisms of phosphorus adsorption and desorption (Silva et al 1987;Kwari & Batey 1991;Romanya et al 1994), changes in the microbial population (Vazquez et al 1993), and changes in the microbial immobilisation and mineralisation of P (Dunn et al 1985;Polglase et al 1992).…”

Section: Introductionmentioning

confidence: 98%

Changes in heated and autoclaved forest soils of S.E. Australia. II. Phosphorus and phosphatase activity

Serrasolsas

Khanna

1995

Biogeochemistry

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Abstract. The effect of soil heat and autoclaving on labile inorganic P (Bray I), microbial P (P-flush) and on phosphatase activity was studied by heating five forest soils in the laboratory, which simulated the effects of heat during bushfires. Top soil was heated to 60 'C, 120 'C and 250 "C or autoclaved for 30 minutes. Soils were analysed immediately after heating and during seven months of incubation to assess immediate and longer-term effects of heating.Labile inorganic P increased immediately after heating and autoclaving soils, with the highest amount recorded for the 250 'C treatment. Phosphorus associated with microbial biomass decreased with heat, and none or small amounts were detected in soils heated to 250 "C and autoclaved, because high temperatures killed the microbial population. Most of the P released from microbes acted as a source of labile inorganic P in soils low in inorganic P, and some of the released P was fixed by the soil. In one soil high in inorganic labile P and with undetectable amounts of microbial-P, the increase in Bray P on heating could only be assigned to solubilisation of other sources of total P. Because high temperatures denature enzymatic proteins, phosphatase activity diminished with the increase in temperature, and no activity was detected in 250 'C and autoclaved soils.Phosphorus released by heating decreased during incubation in three of the five soils studied, approaching values observed in unheated soils. Simultaneously, an increase in microbial P was observed in these heated soils, indicating that the partial recovery of microbial biomass acted as a sink for the decrease in Bray-P measured. Phosphatase activity recovered only partially during incubation of heated soils.

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“…A number of studies have found an increase in extractable inorganic P on low-temperature heating or drying of soils (Kwari & Batey, 1991;Grava et al, 1961;Serrasolsas & Khanna, 1995). The increase, according to Serrasolsas & Khanna (1995), could probably be due to solubilisation of a readily extractable fraction of the total P. In those studies, however, no mention is given on the source or mode of occurrence of the P in the heated or dried soils.…”

Section: R E S U L T S a N D Discussion Extractable Pmentioning

confidence: 99%

Effect of heating vermiculites on extractability of phosphorus and some essential plant micronutrients

Marwa

Meharg²,

Rice³

2012

Clay miner.

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The study assessed the effect of heating vermiculites on extractability of phosphorus, iron, zinc and manganese with respect to their potential agricultural use. Of these elements, phosphorus was from apatite and monazite that occur as accessory minerals in vermiculites. Vermiculites were heated at 15–800°C and digested by acetic acid for extracting phosphorus and diethylene triamine pentaacetic acid (DTPA) for extracting zinc, iron and manganese. Phosphorus in the extract was analysed by a flow injection method while zinc, iron and manganese were measured by atomic absorption spectrometry. The results showed that heating vermiculites to 400°C enhanced extractability of phosphorus from apatite and monazite to a level of 335 mg kg–1. Further heating to 800°C reduced extractable phosphorus to less than 75 mg kg–1. Maximum extractable zinc, iron and manganese found were 2.7, 19.1 and 22.9 mg kg–1, respectively, values that are beneficial and tolerable by most plants. Thus, it was concluded that heating vermiculites to ⩽ 400°C optimizes extractability of phosphorus from incorporated apatite and monazite and some essential plant micronutrients in vermiculites.

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Effect of heating on phosphate sorption and availability in some north‐east Nigerian soils

Cited by 18 publications

References 21 publications

Soil phosphorus availability after slash-and-burn fires of different intensities in rubber agroforests in Sumatra, Indonesia

Soil phosphorus availability after slash-and-burn fires of different intensities in rubber agroforests in Sumatra, Indonesia

Changes in heated and autoclaved forest soils of S.E. Australia. II. Phosphorus and phosphatase activity

Effect of heating vermiculites on extractability of phosphorus and some essential plant micronutrients

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