The Experts below are selected from a list of 14163 Experts worldwide ranked by ideXlab platform
Bostang Radjagukguk - One of the best experts on this subject based on the ideXlab platform.
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Pengaruh Interaksi Hara Nitrogen Dan Fosfor Terhadap Pertumbuhan Tanaman Jagung (Zea Mays L) Pada Tanah Regosol Dan Latosol [the Effect of Interaction of Nitrogen and Phosphorus Nutrients on Maize (Zea Mays L.) Grown in Regosol and Latosol Soils]
2010Co-Authors: Arifin Fahmi, Sri Nuryani Hidayah Utami, Bostang RadjagukgukAbstract:Nitrogen (N) and Phosphorus (P) are essential nutrients for plant.The deficiency one of these nutrients will be limiting the plant growth.A glass house experiment with one treatment factor was conducted to study the effect and interaction of N and P fertilizers application on maize growth in regosol and Latosol soils. The results show that the interaction of N and P fertilizers application(N 1 P 1) on regosol had a significant influence to plant height on 3 to 7 weeks after planting, whilst on Latosol had a significant influence to plant height on 1 to 5 weeks after planting. The shoot dry weight, root dry weight and total dry weight of maize on regosols and Latosol soils were significantly influenced by the interaction of N and P fertilizers application (N 1 P 1). There were a positive correlation between N and P fertilizers application on both soils types to the total plant dry weight.
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PERAN PEMUPUKAN POSFOR DALAM PERTUMBUHAN TANAMAN JAGUNG (Zea mays L.) DI TANAH REGOSOL DAN Latosol
2009Co-Authors: Arifin Fahmf, Sri Nuryani Hidayah Utami, Syamsudin Syamsudin, Bostang RadjagukgukAbstract:Phosphorus (P) is an essential element for plants, deficiency and excess of P in soil will limit plant growth. It is required to applicate P fertilizer in appropriate dosage for promoting plant growth on the soil with different properties. The purpose of experiment was to study the respon of maize (Zea mays L.) for phosphorus fertilization on Regosol and Latosol soils. A glass house experiment was conducted to study maize response on P fertilizer application in Regosol and Latosol soils. The treatment 1was 0, 112, 336, 1008, 3024 and 9072 kg superfosfat ha . P fertilizer tend to increase the biomass of maize but exceed of P fertilizer reduced maize biomass. The optimum fertilization and vailability of P for plant affected by soil properties.
B Van Raij - One of the best experts on this subject based on the ideXlab platform.
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calcium sulphate phosphogypsum and calcium carbonate in the amelioration of acid subsoils for root growth
Plant and Soil, 1997Co-Authors: M C S Carvalho, B Van RaijAbstract:The chemical barrier to root development existing in the subsoils of acid soils is a subject of increasing interest. In order to better understand the factors involved in the amelioration of subsoil acidity, the effects of calcium sulphate, phosphogypsum and calcium carbonate on the properties of the solid and liquid phases of subsoil samples and on the growth and nutrient uptake by maize (Zea mays L.) were evaluated. The soils used were two alic red-yellow Latosols, two acric dusky red Latosols and one alic dark-red Latosol from the State of Sao Paulo, Brazil. A vertical split-root technique was used in a greenhouse experiment, with the plants initially grown in a small pot with 130 g fertile soil, which was introduced in a larger pot containing 2 dm3 of the subsoil samples. The treatments consisted of a control (C) and applications of calcium carbonate (CC), calcium sulphate (CS) and phosphogypsum (PG) at the rate of 10 mmolc Ca2+ dm-3. CS and PG reduced soil acidity, but in a much smaller proportion than CC. Calcium carbonate reduced the activity of Al3+ because of the increase in pH. Total aluminum and calcium contents in the soil solution were much higher for the red-yellow Latosols than for the other soils, indicating lower sorption of Ca2+ and\(SO_4^{2 - } \) in these soils. The activity of Al in the soil solution was decreased in different ways for the five soils, depending on the ionic strength and the formation of the ionic pair\(AlSO_4^ + \) and, in the case of PG, the formation of complexes of Al with F (AlF2+,\(AlF_2^ + \) and\(AlF_3^\bigcirc \)). The subsoil samples presented severe restrictions for maize root growth and all three treatments were equally effective in increasing root development, which could be attributed to the supply of calcium in one of the acric dusky red Latosols and a combined effect of the amendment in reducing the activity of Al and increasing the activity of Ca in the soil solution in the other soils. As a consequence the three treatments increased in the same manner water, N and K uptake from the subsoil and the dry matter production of maize. It can be concluded that, for the soils considered in this research, phosphogypsum is an effective amendment for acid subsoils containing low calcium or toxic aluminum contents.
Dajiong Ling - One of the best experts on this subject based on the ideXlab platform.
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Impacts of simulated acid rain on soil enzyme activities in a Latosol
Ecotoxicology and environmental safety, 2010Co-Authors: Dajiong Ling, Qian-chun Huang, Ying OuyangAbstract:Acid rain pollution is a serious environmental problem in the world. This study investigated impacts of simulated acid rain (SAR) upon four types of soil enzymes, namely the catalase, acid phosphatase, urease, and amylase, in a Latosol. Latosol is an acidic red soil and forms in the tropical rainforest biome. Laboratory experiments were performed by spraying the soil columns with the SAR at pH levels of 2.5, 3.0, 3.5., 4.0, 4.5, 5.0, and 7.0 (control) over a 20-day period. Mixed results were obtained in enzyme activities for different kinds of enzymes under the influences of the SAR. The catalase activities increased rapidly from day 0 to 5, then decreased slightly from day 5 to 15, and finally decreased sharply to the end of the experiments, whereas the acid phosphatase activities decreased rapidly from day 0 to 5, then increased slightly from day 5 to 15, and finally decreased dramatically to the end of the experiments. A decrease in urease activities was observed at all of the SAR pH levels for the entire experimental period, while an increase from day 0 to 5 and then a decrease from day 5 to 20 in amylase activities were observed at all of the SAR pH levels. In general, the catalase, acid phosphatase, and urease activities increased with the SAR pH levels. However, the maximum amylase activity was found at pH 4.0 and decreased as the SAR pH increased from 4.0 to 5.0 or decreased from 4.0 to 2.5. It is apparent that acid rain had adverse environmental impacts on soil enzyme activities in the Latosol. Our study further revealed that impacts of the SAR upon soil enzyme activities were in the following order: amylase>catalase>acid phosphatase>urease. These findings provide useful information on better understanding and managing soil biological processes in the nature under the influence of acid rains.
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impacts of simulated acid rain on cation leaching from the Latosol in south china
Chemosphere, 2007Co-Authors: Jiaen Zhang, Ying Ouyang, Dajiong LingAbstract:Abstract Acid rain is a problem of increasing agricultural, environmental, and ecological concerns worldwide. This study investigated impacts of simulated acid rain (SAR) on cation leaching from the Latosol in south China. Latosol is an acidic red soil and occurs in the tropical rainforest biome. Laboratory experiments were performed by leaching the soil columns with the SAR at a pH range from 2.5 to 7.0 over a 21-day period. A linear increase in effluent K + concentration was found at the SAR pH ⩽3.0, whereas an exponential decrease in effluent Na + concentration was observed at all levels of the SAR pH. In general, leaching of Ca 2+ and Mg 2+ from the Latosol increased as the SAR pH decreased. There was a very good nonlinear correlation between the removal of soil K + and the SAR pH ( R 2 = 0.91), a good nonlinear correlation between the removal of soil Mg +2 and the SAR pH ( R 2 = 0.83), a fairly good nonlinear correlation between the removal of soil Ca +2 and the SAR pH ( R 2 = 0.56), and no correlation between the removal of soil Na + and the SAR pH ( R 2 = 0.06). Our study further revealed that the removal of soil cations such as K + , Ca +2 , and Mg +2 can be quantified by the quadratic polynomial equations. In addition, impacts of the SAR on cation leaching depended not only on the SAR pH but also on the original soil pH.
H. Paul Wang - One of the best experts on this subject based on the ideXlab platform.
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Chromium speciation in mildly heated Cr(VI)-doped Latosol soil.
Journal of synchrotron radiation, 2010Co-Authors: Yu-ling Wei, Hui-fang Hsieh, Yen Shiun Peng, Kai Wen Chen, Chang Yuan Lin, H. Paul WangAbstract:Cr(VI) chemical reduction in natural organic matter (NOM)-bearing Latosol soil was investigated under various heating conditions at < or = 378 K. An enhanced Cr(VI) reduction rate has been observed for the reaction at 353-378 K. The effect of Fe(II) naturally occurring in the Latosol soil on Cr(VI) chemical reduction is negligible compared with the effect of NOM. Cr(OH)(3) was quantitatively specified by X-ray absorption spectroscopy to be the key chromium species ( approximately 80%) after approximately 90% of Cr(VI) was chemically reduced by NOM at 353-378 K. This study indicates a potential strategy for using the heat extracted from industrial flue gas with a heat exchanger to chemically reduce Cr(VI) in NOM-bearing or organics-amended soils that contain Cr(VI).
Zhao Zhi-zhong - One of the best experts on this subject based on the ideXlab platform.
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SPATIAL DISTRIBUTION PATTERN OF TRACE ELEMENTS CONTENTS OF Latosol IN THE WEST OF HAINAN ISLAND
2005Co-Authors: Zhao Zhi-zhongAbstract:The contents of trace elements in different soils derived from five Latosol profiles in the west of Hainan Island indicated that the trace elements contents of soils show a similar variation trend. For example, the average contents of Cu, Pb, Zn, As are higher and Ni, Mo, Cd, Sn, Sb are lower than those of Latosol soils in South China. The study also indicated that the contents of trace elements in the soils and their variation trend are determined by the parent material of the soils. And although only a little amount of trace elements has undergone vertical migration in the Latosol profiles, the contents of trace elements and their spatial variation can be changed. Trace elements in the soils such as As, Cd, Pb can be enriched in the lower layers of the Latosol profiles because of the influence of human’s activities.
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On the spatial distribution pattern of major elements and trace elements contents in Latosol in the western part of Hainan
Journal of Hainan Normal University, 2004Co-Authors: Zhao Zhi-zhongAbstract:Various soil samples were collected from different Latosol profiles in the western part of Hainan, and according to the content of major elements and trace elements of these samples, the composition features of the elements and their spatial changes in Latosol were analyzed, and the migration and enrichment laws of the major elements and trace elements of different profiles were also discussed.