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| 1 | Aging Effects of Organic and Inorganic Fertilizers on Phosphorus Fractionation in a Calcareous Sandy Loam Soil显示文摘In most arid and semiarid soils, naturally occurring phosphorus(P) is a major yield-limiting plant nutrient. In this study, to investigate the effects of organic(OP) and inorganic P(IP) sources on P fractionation, a calcareous sandy loam alkaline soil was fertilized with OP and IP fertilizers at low(80 mg P kg^(-1) soil) and high(160 mg P kg^(-1) soil) application rates. Three combinations of OP and IP(i.e., 75% OP + 25% IP, 50% OP + 50% IP, and 25% OP + 75% IP) were applied at low and high application rates,respectively, followed by soil aging for 21 d. Soil samples were collected after 1, 2, 3, 7, and 21 d and subjected to sequential extraction to analyze soluble and exchangeable, Fe-and Al-bound, Ca-bound, and residual P fractions. The soluble and exchangeable P fraction significantly increased up to 24.3%, whereas the Ca-bound fraction decreased up to 40.7% in the soils receiving 75% OP + 25% IP and 50% OP + 50% IP, respectively, compared with the control(receiving no P fertilizer). However, the transformation of P fractions was influenced by aging time. Addition of P sources caused instant changes in different P fractions, which then tended to decline with aging time. Change in soil p H was the limiting factor in controlling P availability. At high application rate, the OP source significantly increased soil P availability compared with the IP source with soil aging. Depending on P fractionation, a proper combination of OP and IP fertilizers, as long-term slow and instant P-releasing sources for plant uptake, respectively, may be a sustainable strategy to meet crop P requirements in the arid and semiarid soils. | Munir AHMAD Mahtab AHMAD Ahmed H.EL-NAGGAR Adel R.A.USMAN Adel ABDULJABBAR Meththika VITHANAGE Jamal ELFAKI Abdulelah AL-FARAJ Mohammad I.AL-WABEL | 2018 | Pedosphere2018，28，6： | 8 |
| 2 | Potential of biochar and organic amendments for reclamation of coastal acidic-salt affected soil显示文摘Salinity and acidity have affected several hundred million hectares of land throughout the globe which poses a major threat to global food security and biodiversity.Application of organic amendments for salt-affected soils has been identified as one of the most effective ways to mitigate salinity-induced problems and considered as a green technique offering twin benefits of waste load reduction and land reclamation.However,studies on reclaiming acidic-salt affected soils are limited.Therefore,this study aimed to determine the reclamation potential of biochars and organic amendments involving Gliricidia sepium biochar produced at 300℃,500℃,and 700℃,green waste compost,and municipal sewage sludge at three different amend-ment ratios,1.0%,2.5%and 5.0%.The incubation experiment was conducted for a 4-month period with different amendment ratios applied to the coastal acidic-salt affected soil.Subsamples were extracted from incubation pots after 1 and 4 months and analyzed for soil chemical parameters(pH,EC,NO_(3)^(−),PO_(4)^(3−,total organic carbon,cation exchange capacity,sodium adsorption ratio,exchangeable sodium percentage)and microbial enzyme activity(catalase activity,and acid-and alkaline phosphatase activity).All organic amendments demonstrated enhancement of the soil properties in a significant manner.However,increasing incubation time and amendment ratio increase the changes of soil parameters by a great percentage.Therefore,the maximum amendment ratio of 5.0%and 4 months of incubation period rendered a significant improvement in the reclamation of acidic-salt affected soil.However,the biochar produced at 500℃ contributed the maximum towards the improved physicochemical and biochemical profile of acidic-salt affected soil,making it the most promising organic amend-ment for the reclamation of acidic-salt affected soil.The overall reclamation efficiency of organic amendments registered the following order of variation:700 BC | Viraj Gunarathne Athula Senadeera Udaya Gunarathne Jayanta Kumar Biswas Yaser A.Almaroai Meththika Vithanage | 2020 | Biochar2020，2，1： | 2 |
| 3 | Effects of soil type and fertilizer on As speciation in rice paddy contaminated with As-containing pesticide显示文摘 | Vithanage M Rajapaksha A U Wijesekara H | 2014 | Environmental Earth Sciences2014，71，2： | 1 |
| 4 | Arsenicuptake by plants and possible phytoremediation applications : abrief overview 显示文摘 | Vithanage M Dabrowska B B Mukherjee A B ef al | 2012 | Environmental Chemistry Letters2012，10，3： | 1 |
| 5 | Isozymes as genetic markers for Macadamia 显示文摘 | Vithanage V Winks C W | 1992 | Sci Hort1992，49，12： | 1 |
| 6 | Progress made with molecular markers for genetic improvement of Macadamia 显示文摘 | Vithanage V Hardner C Anderson K L | 1998 | Acta Hort1998，461，8： | 1 |
| 7 | Effect of temperature on pollen germination and pollen tube growth of four cultivars of mango ( Mangifera indica L ) 显示文摘 | Sukhvibul N Whiley A W Vithanage V | 2000 | J Hort Sci Biotechnol2000，75，2： | 1 |
| 8 | Genetic relationships among Macadamia varieties grown in south Africa as assessed by RAF markers 显示文摘 | Peace C P Allan P Vithanage V | 2005 | S Afr J Plant Soil2005，22，2： | 1 |
| 9 | A comparison of molecular markers for genetic analysis of Macadamia 显示文摘 | Peace C P Vithanage V Neal J | 2004 | J Hort Sci Bioteclm2004，79，6： | 1 |
| 10 | MIMO- OFDM pilot placement algorithms for wideband in- door communications显示文摘 | VITHANAGE C CEPEDA R COON J | 2011 | IEEE Transactions on Com- munications2011，59，2： | 1 |
| 11 | A developmental study of the structure and pollen receptivity of the macadamia pistil in relation to protandry and self-incompatibility 显示文摘 | Sedgley M Blesing M A Vithanage H I M V | 1985 | Bot Gaz1985，146，1： | 1 |
| 12 | Receiver-initiated medium access control protocols for wireless sensor networks显示文摘 | Fafoutis X Mauro A D Vithanage M D | 2015 | Computer Networks2015，76，： | 1 |
| 13 | The role of biochar, natural irotl oxides, and nanomaterials as soil amend- ments for immobilizing metals in shooting range soil 显示文摘 | Rajapaksha A U Ahmad M Vithanage M | 2015 | Envi- ronmental Geochemistry and Health2015，37，6： | 1 |
| 14 | Comtiarison of identification systems for psychrotrophic bacteria isolated fromou bovine milk显示文摘 | VITHANAGE N R YEAGER T R JADHAV S R | 2014 | International Journal of Food Microbiology2014，189，： | 1 |
| 15 | Pyrolysis condition affected sulfamethazine sorption by tea waste biochars 显示文摘 | Rajapaksha A U Vithanage M Zhang M | 2014 | Bioresource Technology2014，166，： | 1 |
| 16 | Global irrigated area map (GIAM),derived from remote sensing,for the end of the last millennium显示文摘 | Thenkabail P S Biradar C M Noojipady P Dheeravath V Li Y J Velpuri M Gumma M Reddy G P O Tutral H Cai X L Vithanage J Schull M Dutta R | | 0，，14： | 1 |
| 17 | Pyrolysis condition affected sulfamethazine sorption by tea waste biochars显示文摘 | Rajapaksha A U Vithanage M Zhang M | 2014 | Bioresource Technology2014，166，： | 1 |
| 18 | Trichloroethylene adsorption by pine needle biochars produced at various pyrolysis temperatures显示文摘 | Mahtab Ahmad Sang Soo Lee Anushka Upamali Rajapaksha Meththika Vithanage Ming Zhang Ju Sik Cho Sung-Eun Lee Yong Sik Ok | 2013 | Bioresource Technology2013，，： | 1 |
| 19 | A comparison of molecular markers for genetic analysis of macadamia显示文摘 | Peace CP Vithanage V Neal J | | 0，，06： | 1 |
| 20 | Sorption and transport of sulfamethazine in agricultural soils amended with invasive-plant-derived biochar显示文摘 | Vithanage M Rajapaksha A U Tang X Y | 2014 | Journal of Environmental Management2014，141，： | 1 |
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