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Saroj Kumar Sanyal - One of the best experts on this subject based on the ideXlab platform.
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release pattern of non exchangeable potassium reserves in alfisols inceptisols and Entisols of west bengal india
Geoderma, 2013Co-Authors: Gautam Kumar Sarkar, Asoke P Chattopadhyay, Saroj Kumar SanyalAbstract:Abstract Eight surface soil samples representing three soil orders viz., Inceptisols, Alfisols and Entisols were analyzed to characterize the non-exchangeable potassium (K) reserves. The mineralogical composition of the experimental soils varied widely. The reserves of Step-K and Constant rate K were computed by repeated extraction of soils with boiling1 M HNO 3 . The cumulative release of non-exchangeable K by such repeated extraction followed a semi-logarithmic behavior with number of extractions, suggesting that the release of non-exchangeable K decreased with successive extractions. The threshold levels of K in soil solution below which the release of K from the initially non-exchangeable K reserves starts were also evaluated for the selected soils in terms of K activity ratio, K concentration and exchangeable K in 0.01 M and 0.002 M CaCl 2 solution. Higher threshold value of Entisols and Inceptisols compared to Alfisols indicates less tenacity with which K is held in wedge zones of micaceous minerals. These threshold values changed considerably for all the soils as the electrolyte concentration decreased from 0.01 M to 0.002 M. Specifically held K, determined as exchangeable K below which the Gapon constant (K G ) showed a sharp rise, varied from soil to soil in almost the same manner as noted for threshold K levels in these soils.
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tracer diffusion of potassium in some alfisols inceptisols and Entisols
Journal of the Indian Society of Soil Science, 1996Co-Authors: P K Mani, Saroj Kumar SanyalAbstract:Tracer diffusion studies were conducted to obtain the porous diffusion coefficient (Dp) of potassium (K) in four surface soils of different orders, having contrasting soil properties. The half-cell technique was used for obtaining the Dp values. The effect of a number of factors such as soil water content, bulk density and temperature on K diffusion were examined. Diffusion coefficient values increased in all the soils with increase in soil water content, bulk density and temperature. The tracer: background ratio and the supporting background electrolyte were also observed to exert significant effect in nearly all the cases. The findings have.been interpreted in terms of the interactions of diffusing potassium ions with the ‘local’ diffusion environment.
Bambang Siswo Susilo - One of the best experts on this subject based on the ideXlab platform.
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pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah ultisols dan Entisols pada pertanaman kedelai glycine max l merril
Jurnal Pembangunan Pedesaan, 2012Co-Authors: Bondansari Bondansari, Bambang Siswo SusiloAbstract:Pemanfaatan Ultisols dan Entisols untuk peningkatan produksi kedelai perlu dilakukan perbaikan kualitas tanah, diantaranya dengan penambahan zeolit dan pupuk kandang. Tujuan penelitian ini adalah untuk mengetahui pengaruh zeolit dan pupuk kandang terhadap sifat fisik Entisols dan Ultisols, pertumbuhan dan produksi kedelai. Penelitian dilakukan dengan percobaan pot di lahan percobaan Fakultas Pertanian Universitas Jenderal Soedirman. Perlakuan terdiri dari tiga faktor (tanah, zeolit dan pupuk kandang), yaitu 2 jenis tanah (Ultisols dan Entisols), 3 taraf dosis zeolit (0 ton/ha, 2 ton/ha, dan 4 ton/ha), dan 3 taraf dosis pupuk kandang sapi (0 ton/ha, 20 ton/ha, dan 30 ton/ha). Percobaan dirancang dengan menggunakan rancangan acak kelompok (RAK), ulangan 3 kali dan diperoleh 54 unit percobaan. Variabel yang diamati meliputi sifat fisik tanah, pertumbuhan dan produksi kedelai. Hasil penelitian menunjukkan bahwa: 1) peningkatan dosis zeolit sampai 4 ton/ha dan pupuk kandang sampai 30 ton/ha tidak berpengaruh terhadap berat jenis isi (BJI), berat jenis partikel (BJP), porositas tanah Ultisols maupun tanah Entisols, batas lekat (BL), batas gulung (BG), dan batas berubah warna (BBW), akan tetapi peningkatan dosis zeolit mampu meningkatkan nilai batas cair (BC) dan peningkatan dosis pupuk kandang mampu menurunkan indeks plastisitas (IP), dan 2) zeolit secara mandiri tidak berpengaruh dalam meningkatkan pertumbuhan dan produksi kedelai, sedangkan peningkatan dosis pupuk kandang mampu meningkatkan bobot basah polong, bobot kering polong dan jumlah polong kedelai.
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pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah ultisols dan Entisols pada pertanaman kedelai glycine max l merril
Jurnal Agronomika, 2011Co-Authors: Bondansari Bondansari, Bambang Siswo SusiloAbstract:Pemanfaatan tanah Ultisols dan tanah Entisols untuk peningkatan produksi kedelai perlu dilakukan perbaikan kualitas tanah, diantaranya dengan penambahan zeolid dan pupuk kandang. Pemanfaatan zeolit dan pupuk kandang diharapkan mampu sebagai bahan amelioran tanah sehingga produksi tanaman kedelai bias ditingkatkan. Terkait dengan hal tersebut telah dilakukan penelitian dengan tujuan untuk : 1) mengetahui pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah Entisols dan Ultisols dan 2) mengetahui pengaruh zeolit dan pupuk kandang terhadap pertumbuhan dan produksi tanaman kedelai pada tanah Entisols dan Ultisols. Penelitian dilakukan dengan percobaan pot di lahan percobaan Fakultas Pertanian Universitas Jenderal Soedirman. Perlakuan terdiri dari tiga faktor, yaitu jenis tanah, zeolit dan pupuk kandang, masing-masing 2 (dua) jenis tanah (T1: Ultisols dan T2: Entisols), 3 (tiga) taraf dosis zeolit (Z0: 0 ton/ha, Z1: 2 ton/ha, dan Z2: 4 ton/ha), dan 3 (tiga) taraf dosis pupuk kandang sapi (P0: 0 ton/ha, P1: 20 ton/ha, dan P2: 30 ton/ha). Percobaan dirancang dengan menggunakan rancangan acak kelompok (RAK), masing-masing kombinasi perlakuan diulang tiga kali dan diperoleh 54 unit percobaan. Variabel yang diamati meliputi variabel sifat fisik tanah, variabel pertumbuhan dan produksi tanaman. Hasil penelitian menunjukkan bahwa : 1) peningkatan zeolit sampai 4 ton/ha dan pupuk kandang sampai 30 ton/ha tidak berpengaruh terhadap berat jenis isi (BJI), berat jenis partikel (BJP) dan porositas tanah Ultisols maupun tanah Entisols, 2) nilai batas cair (BC) dipengaruh oleh dosis zeolit dan dosis pupuk kandang dan jenis tanahnya, batas lekat (BL) dan batas berubah warna (BBW) ditentukan oleh jenis tanah, sedangkan batas gulung (BG) dipengaruhi oleh interaksi antara jenis tanah dan dosis zeolit, 3) dosis zeolit dan dosis pupuk kandang tidak mempengaruhi nilai persediaan air maksimum (PAM) maupun jangka olah (JO) tanah Ultisols maupun tanah Entisols, dan nilai indek plastisitas (IP) selain dipengaruhi secara mandiri oleh jenis tanah juga dipengaruhi oleh dosis pupuk kandang, dan 4) peningkatan dosis pupuk kandang mampu meningkatkan bobot basah polong, bobot kering polong dan jumlah polong kedelai. Kata kunci: zeolit, pupuk kandang, ultisols, Entisols, kedelai ABSTRACT Use of land for Ultisols and Entisols soil increased soybean production is necessary to improve soil quality, such as by adding zeolid and manure. Utilization of zeolites and manure as an ingredient amelioran expected to land so that the production of soybean crops improved bias. Related to this has done research with the aim to: 1) determine the effect of zeolite and manure on some soil physical properties of Entisols and Ultisols and 2) determine the effect of zeolite and manure on the growth and production of soybean crops in the Entisols and Ultisols. The study was conducted with a pot experiment in field trials UnSoed Faculty of Agriculture. The treatment consists of three factors, namely the type of soil, zeolite and manure, each 2 (two) types of soil (T1: Ultisols and T2: Entisols), 3 (three) standard doses of zeolite (Z0: 0 tons / ha, Z1 : 2 tons / ha, and Z2: 4 tons / ha), and 3 (three) standard doses of cow manure (P0: 0 tons / ha, P1: 20 tons / ha, and P2: 30 tons / ha). The experiment was designed using a randomized block design (RBD), each treatment combination was repeated three times and obtained 54 experimental units. Variables observed include variable physical properties of soil, crop growth and production variables. The results show that: 1) an increase in the zeolite to 4 tons / ha and manure up to 30 tons / ha had no effect on bulk density, particle density and the porosity of the Ultisols and Entisols, 2) the limit value liquid influences include dose of zeolite and manure and soil type, the boundary attached and boundary change color is determined by the type of soil, whereas the limit of rolls is influenced by the interaction between soil type and dose of zeolite, 3 ) zeolite dose and dose of manure did not affect the value of the maximum water supply and term tillage Ultisols soil and Entisols soil, and the plasticity index in addition to independently influenced by the type of soil is also influenced by the dose of manure, and 4) increasing doses of manure can improve the wet weight of pods, dry weight of pods and pods of soybean. Key words: zeolid, manure, ultisols, Entisols, soybean
Bondansari Bondansari - One of the best experts on this subject based on the ideXlab platform.
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pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah ultisols dan Entisols pada pertanaman kedelai glycine max l merril
Jurnal Pembangunan Pedesaan, 2012Co-Authors: Bondansari Bondansari, Bambang Siswo SusiloAbstract:Pemanfaatan Ultisols dan Entisols untuk peningkatan produksi kedelai perlu dilakukan perbaikan kualitas tanah, diantaranya dengan penambahan zeolit dan pupuk kandang. Tujuan penelitian ini adalah untuk mengetahui pengaruh zeolit dan pupuk kandang terhadap sifat fisik Entisols dan Ultisols, pertumbuhan dan produksi kedelai. Penelitian dilakukan dengan percobaan pot di lahan percobaan Fakultas Pertanian Universitas Jenderal Soedirman. Perlakuan terdiri dari tiga faktor (tanah, zeolit dan pupuk kandang), yaitu 2 jenis tanah (Ultisols dan Entisols), 3 taraf dosis zeolit (0 ton/ha, 2 ton/ha, dan 4 ton/ha), dan 3 taraf dosis pupuk kandang sapi (0 ton/ha, 20 ton/ha, dan 30 ton/ha). Percobaan dirancang dengan menggunakan rancangan acak kelompok (RAK), ulangan 3 kali dan diperoleh 54 unit percobaan. Variabel yang diamati meliputi sifat fisik tanah, pertumbuhan dan produksi kedelai. Hasil penelitian menunjukkan bahwa: 1) peningkatan dosis zeolit sampai 4 ton/ha dan pupuk kandang sampai 30 ton/ha tidak berpengaruh terhadap berat jenis isi (BJI), berat jenis partikel (BJP), porositas tanah Ultisols maupun tanah Entisols, batas lekat (BL), batas gulung (BG), dan batas berubah warna (BBW), akan tetapi peningkatan dosis zeolit mampu meningkatkan nilai batas cair (BC) dan peningkatan dosis pupuk kandang mampu menurunkan indeks plastisitas (IP), dan 2) zeolit secara mandiri tidak berpengaruh dalam meningkatkan pertumbuhan dan produksi kedelai, sedangkan peningkatan dosis pupuk kandang mampu meningkatkan bobot basah polong, bobot kering polong dan jumlah polong kedelai.
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pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah ultisols dan Entisols pada pertanaman kedelai glycine max l merril
Jurnal Agronomika, 2011Co-Authors: Bondansari Bondansari, Bambang Siswo SusiloAbstract:Pemanfaatan tanah Ultisols dan tanah Entisols untuk peningkatan produksi kedelai perlu dilakukan perbaikan kualitas tanah, diantaranya dengan penambahan zeolid dan pupuk kandang. Pemanfaatan zeolit dan pupuk kandang diharapkan mampu sebagai bahan amelioran tanah sehingga produksi tanaman kedelai bias ditingkatkan. Terkait dengan hal tersebut telah dilakukan penelitian dengan tujuan untuk : 1) mengetahui pengaruh zeolit dan pupuk kandang terhadap beberapa sifat fisik tanah Entisols dan Ultisols dan 2) mengetahui pengaruh zeolit dan pupuk kandang terhadap pertumbuhan dan produksi tanaman kedelai pada tanah Entisols dan Ultisols. Penelitian dilakukan dengan percobaan pot di lahan percobaan Fakultas Pertanian Universitas Jenderal Soedirman. Perlakuan terdiri dari tiga faktor, yaitu jenis tanah, zeolit dan pupuk kandang, masing-masing 2 (dua) jenis tanah (T1: Ultisols dan T2: Entisols), 3 (tiga) taraf dosis zeolit (Z0: 0 ton/ha, Z1: 2 ton/ha, dan Z2: 4 ton/ha), dan 3 (tiga) taraf dosis pupuk kandang sapi (P0: 0 ton/ha, P1: 20 ton/ha, dan P2: 30 ton/ha). Percobaan dirancang dengan menggunakan rancangan acak kelompok (RAK), masing-masing kombinasi perlakuan diulang tiga kali dan diperoleh 54 unit percobaan. Variabel yang diamati meliputi variabel sifat fisik tanah, variabel pertumbuhan dan produksi tanaman. Hasil penelitian menunjukkan bahwa : 1) peningkatan zeolit sampai 4 ton/ha dan pupuk kandang sampai 30 ton/ha tidak berpengaruh terhadap berat jenis isi (BJI), berat jenis partikel (BJP) dan porositas tanah Ultisols maupun tanah Entisols, 2) nilai batas cair (BC) dipengaruh oleh dosis zeolit dan dosis pupuk kandang dan jenis tanahnya, batas lekat (BL) dan batas berubah warna (BBW) ditentukan oleh jenis tanah, sedangkan batas gulung (BG) dipengaruhi oleh interaksi antara jenis tanah dan dosis zeolit, 3) dosis zeolit dan dosis pupuk kandang tidak mempengaruhi nilai persediaan air maksimum (PAM) maupun jangka olah (JO) tanah Ultisols maupun tanah Entisols, dan nilai indek plastisitas (IP) selain dipengaruhi secara mandiri oleh jenis tanah juga dipengaruhi oleh dosis pupuk kandang, dan 4) peningkatan dosis pupuk kandang mampu meningkatkan bobot basah polong, bobot kering polong dan jumlah polong kedelai. Kata kunci: zeolit, pupuk kandang, ultisols, Entisols, kedelai ABSTRACT Use of land for Ultisols and Entisols soil increased soybean production is necessary to improve soil quality, such as by adding zeolid and manure. Utilization of zeolites and manure as an ingredient amelioran expected to land so that the production of soybean crops improved bias. Related to this has done research with the aim to: 1) determine the effect of zeolite and manure on some soil physical properties of Entisols and Ultisols and 2) determine the effect of zeolite and manure on the growth and production of soybean crops in the Entisols and Ultisols. The study was conducted with a pot experiment in field trials UnSoed Faculty of Agriculture. The treatment consists of three factors, namely the type of soil, zeolite and manure, each 2 (two) types of soil (T1: Ultisols and T2: Entisols), 3 (three) standard doses of zeolite (Z0: 0 tons / ha, Z1 : 2 tons / ha, and Z2: 4 tons / ha), and 3 (three) standard doses of cow manure (P0: 0 tons / ha, P1: 20 tons / ha, and P2: 30 tons / ha). The experiment was designed using a randomized block design (RBD), each treatment combination was repeated three times and obtained 54 experimental units. Variables observed include variable physical properties of soil, crop growth and production variables. The results show that: 1) an increase in the zeolite to 4 tons / ha and manure up to 30 tons / ha had no effect on bulk density, particle density and the porosity of the Ultisols and Entisols, 2) the limit value liquid influences include dose of zeolite and manure and soil type, the boundary attached and boundary change color is determined by the type of soil, whereas the limit of rolls is influenced by the interaction between soil type and dose of zeolite, 3 ) zeolite dose and dose of manure did not affect the value of the maximum water supply and term tillage Ultisols soil and Entisols soil, and the plasticity index in addition to independently influenced by the type of soil is also influenced by the dose of manure, and 4) increasing doses of manure can improve the wet weight of pods, dry weight of pods and pods of soybean. Key words: zeolid, manure, ultisols, Entisols, soybean
Sudadi Sudadi - One of the best experts on this subject based on the ideXlab platform.
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Pengaruh Pupuk Alami Bermikroba (Bio-Natural Fertilizer) terhadap Serapan Fosfor dan Pertumbuhan Kacang Tanah pada Tanah Alfisol, Entisol, dan Vertisol
Sains Tanah: Journal of Soil Science and Agroclimatology, 2013Co-Authors: Yasinta Choirina, Sudadi Sudadi, Hery WidijantoAbstract:Title : Effect of Bio-Natural Fertilizer on Phosphorus Uptake and Growth of Peanut in Alfisols, Entisols, and Vertisols. Development of bio-natural fertilizer was needed to overcome the scarcity of fertilizer in Indonesia, the deficiency of soil nutrient, and low efficiency of fertilizer use. The research purposed to study the effect of bio-natural fertilizer formula and find out of best formula on P uptake and growth of peanuts in various soils ordo. The experiment used a completely randomized design with three factors. The first factor was bio-natural fertilizer P1 (vermicompost 100% without enrichment material, without microbial inoculums), P2 (vermicompost 66,67%, enrichment material 33,33% and microbial inoculum of NPKS with proportion of 2:2:1:1), and P3 (vermicompost 33,33%, enrichment material 66,67% and microbial inoculum of NPKS with proportion of 2:2:1:1). The second factor was peanut varieties, Elephant and Rabbit varieties. The third factor was soil ordo, Alfisols, Entisols, and Vertisols. The variables observed were av-P, P uptake, shoot dry weight, soil pH, population of P-solubilizing fungi, plant height, and shoot fresh weight. Data was analyzed by F test at 95% level confidence. The results showed that formula of bio-natural fertilizer influence significantly on P uptake and growth of peanuts in various soils. The formula of bio-natural fertilizer P2 is the best formula to increased P uptake of peanut on Alfisols, Entisol, and Vertisol, as well as for highest peanut growth on Alfisols.
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serapan dan ketahanan azolla terhadap kromium pada vertisols dan Entisols dengan berbagai tinggi genangan air
Sains Tanah: Journal of Soil Science and Agroclimatology, 2013Co-Authors: Sudadi Sudadi, Dwi Priyo Ariyanto, Erwin PurniawatiAbstract:Title : The Uptake and Tolerance of Azolla to Chromium on Vertisols and Entisols at Various Water Levels. This research aims to study the effect of water level, soil kind, chromium concentration (Cr), and their interactions on uptake and tolerance of azolla to Cr. The research was done in March to May 2009 in the green house of Faculty of Agriculture, Sebelas Maret University, Surakarta. The research used completely randomized design (CRD) factorial with three treatment factors, they were: soil kind (Vertisols of Jatikuwung and Entisols Colomadu, Karanganyar), water levels (0; 2; and 7 cm) and Cr concentrations (0; 5; 10; 15; and 20 ppm). There were 191 g of Vertisols and 200 g of Entisols pass to 2 mm sieve put into plastic pot and watering at various levels according to the treatments. A gram of fresh azolla was spread on each pot and incubated for three weeks. Each treatment combinations were replicated three times. Sampling was taken at 1, 2, and 3 weeks after planting for azolla biomass, Cr uptake of azolla, available Cr, and Cr toxicities symptoms of azolla. The data analyzed statistically by Kruskal Wallis test at 95% level significant, followed with Mood Median test. The result shows that soil kind has no significant effect, while water level, Cr concentration, and treatment interaction contribute highly significant influence on uptake and tolerance of azolla to Cr. The highest uptake of Cr at the Vertisols was taken at 7 cm water level and 15 ppm Cr concentration, while at the Entisols was in 2 cm of water level and 15 ppm Cr concentration. Azolla most tolerance to Cr at treatment combination of 2 cm water level and 10 ppm Cr concentration in Vertisols, and at 2 cm water level and 5 ppm Cr concentration at Entisols. Keywords: A. mycrophylla, chromium, Cr uptake and tolerance, water level
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Pengaruh Saat Pemupukan Urea pada Sistem Ganda Azolla‐Padi Sawah terhadap N‐Kapital Tanah dan Hasil Padi di Entisol
Sains Tanah: Journal of Soil Science and Agroclimatology, 2013Co-Authors: Sudadi Sudadi, Sumarno SumarnoAbstract:Title : Fertilizing Time Effect of Urea in Dual System Azolla‐Rice Paddy to Soil Capital Nitrogen and Rice Yield on Entisol. The purposed of research was to study the effect of urea use in dual system azolla‐rice paddy to soil capital nitrogen and rice yield on Entisol. Research was conducted on rice paddy field at Colomadu, Karanganyar district, Central Java. The experiment arranged in single factor randomized completely block design (RCBD), with eight treatments says D1 (azolla + 100 kg urea /ha at 0 day after planting‐dap), D2 (azolla + 100 kg urea /ha at 30 dap), D3 (azolla + 100 kg urea /ha at 60 dap), D4 (azolla + 50 kg urea /ha at 0 and 30 dap), D5 (azolla + 50 kg urea /ha at 30 and 60 dap), D6 (azolla + 50 kg urea /ha at 0 and 60 dap), D7 (control treatment ‐ without azolla nor NPK fertilizer), and D8 (lokal farmer treatment ‐ 250 kg urea /ha split three times, 50 kg/ha at 0 dap, 100 kg/ha at 30 dap and 100 kg/ha at 60 dap). Azolla inoculums spreaded 7 dap at rates 500 g/m2. Variables observed were soil capital nitrogen, soil total‐N, tissue total‐N, soil organic matter content and rice yield. Data taken was analyzed with anova and followed with Duncan Multiple Range Test (DMRT) at 5 % level of significant. The results show that the use of urea in dual system azolla‐rice paddy increase soil capital nitrogen, soil total‐N, tissue total‐N, soil organic matter content and rice yield at Entisol. The highest soil capital nitrogen (0,953 kg/ha) and rice yield (8 ton/ha) were taken from the treatment of D8 and D3 respectively. Keywords: azolla‐rice paddy, rice yield, soil capital nitrogen, Urea
A Dimirkou - One of the best experts on this subject based on the ideXlab platform.
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thermodynamics of phosphate adsorption desorption by alfisols Entisols vertisols and inceptisols
Communications in Soil Science and Plant Analysis, 1996Co-Authors: M Doula, A Ioannou, A DimirkouAbstract:Abstract Adsorption and desorption of phosphorous (P) by four types of greek soils, Alfisols, Entisols, Vertisols, and Inceptisols, were the subject of the present investigation. These processes were studied under different conditions of initially added P concentration and at different temperatures. Analytical data (for all studied soils) show an increasing adsorption due to initially added P concentrations and increasing temperature. The desorption was also increased with the increasing of initially added P concentrations but was decreased with temperature increases, indicating that soil affinity for P was increased as temperature increased. Analytical data and results were explained and compained based on the physical properties of the soils. By using experimental data, equivalent constants, Keq (equivalence was reached between solid sample and P in the liquid phase), were calculated. The thermodynamic constants, ΔG°, ΔH°, and ΔS°, were also estimated and discussed.
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Thermodynamics of phosphate adsorption‐desorption by alfisols, Entisols, vertisols, and inceptisols
Communications in Soil Science and Plant Analysis, 1996Co-Authors: M Doula, A Ioannou, A DimirkouAbstract:Abstract Adsorption and desorption of phosphorous (P) by four types of greek soils, Alfisols, Entisols, Vertisols, and Inceptisols, were the subject of the present investigation. These processes were studied under different conditions of initially added P concentration and at different temperatures. Analytical data (for all studied soils) show an increasing adsorption due to initially added P concentrations and increasing temperature. The desorption was also increased with the increasing of initially added P concentrations but was decreased with temperature increases, indicating that soil affinity for P was increased as temperature increased. Analytical data and results were explained and compained based on the physical properties of the soils. By using experimental data, equivalent constants, Keq (equivalence was reached between solid sample and P in the liquid phase), were calculated. The thermodynamic constants, ΔG°, ΔH°, and ΔS°, were also estimated and discussed.
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kinetics of potassium adsorption by Entisols of greece
Communications in Soil Science and Plant Analysis, 1994Co-Authors: A Dimirkou, A Ioannou, M Doula, J Mitsios, Ch DeligianniAbstract:Abstract The kinetics of potassium adsorption from solution to exchangeable phases was investigated on Entisols Herothern from central Greece. Potassium adsorption with time was evaluated on Ca‐saturated samples using 3.5, 16.8, 67.5 and 86.0 ppm initial concentrations and pH levels of 5.0, 6.0, 7.0, 8.0 and 9.0. Four mathematical models (first‐order rate, parabolic diffusion, power function and Elovich) were used to describe cumulative K adsorption. Comparisons of coefficients of determination (r2) indicated that the power function, Elovich and first‐order rate models adequately described cumulative K adsorption, whereas the parabolic diffusion model was less successful. Constants A and B were calculated from reaction time vs. quantity of K adsorbed using the four mathematical models. From all four tested models only the power function and first‐order models were found to be transformed to pH‐dependent forms.
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potassium sorption by Entisols of greece as described by commonly used isotherms
Communications in Soil Science and Plant Analysis, 1994Co-Authors: Ch Deligianni, A Dimirkou, A Ioannou, Ch PaschalidisAbstract:Abstract The soils of agricultural areas in Greece are formed from alluvial calcareous deposits, mainly classified as Entisols. The objectives of the present investigation were to elucidate the most commonly used isotherms of potassium adsorption by Entisols at pH levels of 5.0, 6.0, 7.0, 8.0 and 9.0 and initial concentrations of 3.5, 10.7, 17.8, 22.1, 32.1, 37.1, 43.6, 53.6, 60.7, 69.3, 74.3, 78.6 and 85.7 μgK/ml of potassium solution. Isotherms used included those of Langmuir, Freundlich and Temkin. They were fitted by regression to the adsorption data and compared on the basis of goodness of fit (using the correlation coefficient of Pearson r2). Each was found to describe K sorption by this soil with comparable success, with the Freundlich model being slightly superior. The effect of pH on the potassium adsorption by this soil was studied and Langmuir, Freundlich and Temkin isotherms were converted to the forms: Langmuir: C/X = (179.48–17.87 pH) + (0.039–2.17 × 10‐3 pH) C Freundlich: lnX = ln (‐0.166 +...
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kinetic study of phosphorus desorption by alfisols and Entisols
Communications in Soil Science and Plant Analysis, 1993Co-Authors: A Dimirkou, I K Mitsios, A Ioannou, Ch Pashalidis, M DoulaAbstract:Abstract The kinetics of phosphorus (P) desorption by six Greek soils, four Alfisols and two Entisols, have been studied. By the addition of several amounts of P fertilizers at different water/soil rations and different contact times, that amount of P fertilizer required for the two major categories for Greek soils in order to avoid enviromental pollution from overdoses was determined. The experimental data lead to the same desorption model as given by Sharpley (1981): Pd = kPot∂wb; where, Pd is the amount of P desorption from the soil in μg P/g soil, Po the amount of P fertilizers in grams added into the soil, t the contact time of P fertilizers with the soil, w the water/soil rations, and k, ∂, and b constants. The values of the ∂, k, and b constants for each soil are nearly the same for all the experimental conditions. For the Entisols, the ∂ values are lower than for the Alfisols. Calcium carbonate (CaCO3) and exchangeable Ca of the Entisols influenced negatively the desorption‐time relationship, whil...
