scholarly journals Root-induced iron oxidation, pH changes and zinc solubilization in the rhizosphere of lowland rice

1995 ◽  
Vol 131 (1) ◽  
pp. 129-137 ◽  
Author(s):  
G. J. D. KIRK ◽  
J.B. BAJITA
Keyword(s):  
Iron Oxidation ◽  
Lowland Rice ◽  
Ph Changes ◽  
Zinc Solubilization

Root-induced iron oxidation and pH changes in the lowland rice rhizosphere

1994 ◽  
Vol 128 (3) ◽  
pp. 469-477 ◽  
Author(s):  
C. B. M. BEGG ◽  
G. J. D. KIRK ◽  
A. F. MACKENZIE ◽  
H.-U. NEUE
Keyword(s):  
Iron Oxidation ◽  
Lowland Rice ◽  
Ph Changes ◽  
Rice Rhizosphere

Analysis of phosphorus in two humic acid fractions of intensively cropped lowland rice soils by 31P-NMR

2000 ◽  
Vol 51 (3) ◽  
pp. 391-402 ◽  
Author(s):  
N. Mahieu ◽  
D. C. Olk ◽  
E. W. Randall
Keyword(s):  
Humic Acid ◽  
31P Nmr ◽  
Lowland Rice ◽  
Rice Soils

Lowland Rice Yield as Affected by Straw Incorporation and Inorganic Fertilizer Over Cropping Seasons in Fluvisol

2014 ◽  
Vol 3 (1) ◽  
pp. 129-141
Author(s):  
Brahima Koné ◽  
Zadi Florent ◽  
Gala bi Trazié Jeremie ◽  
Akassimadou Edja Fulgence ◽  
Konan Kouamé Firmin ◽  
...  
Keyword(s):  
Grain Yield ◽  
Rice Variety ◽  
Mineral Fertilizer ◽  
Lowland Rice ◽  
Inorganic Fertilizer ◽  
Cropping Season ◽  
Significant Difference ◽  
Straw Incorporation ◽  
Cropping Seasons ◽  
Fertilizer Effect

Grain yield stabilization of lowland rice over cropping seasons was explored using different compositions of inorganic fertilizers (NPK, NPKCa, NPKMg, NPKZn, NPKCaMg, NPKCaZn and NPKCaMgZn) and straw incorporation (3, 6, 9, 12 and 15 tha-1 ). No fertilizer and no straw amended plot was the control in a split-plot design with three replications laid in a Fluvisol of Guinea savanna in Centre Cote d’Ivoire. Three weeks old nursery rice variety NERICA L19 was transplanted. No significant difference of grain yield was observed between the different treatments excluding the highest yields recorded for treatments NPKMg (5.09 tha-1 ), NPKZn (5.15 tha-1 ) and NPKCaéMg (5.31 tha-1 ) compared with 12 (3.95 tha1 ) and 15 tha-1 (4.14 tha-1 ) as straw rates respectively. Grain yield declining trend was more pronounced for mineral fertilizer treatments showing twice greater depressive effect of cropping cycle compared with the straw especially, for treatments characterized by highest grain yield in the first cropping season and similar grain yields were recorded for both sources of nutrient in the third cropping cycle. Of slowness of nutrients releasing by straw, highest grain yield was expected for this soil amender within a longer period of cultivation whereas, unbalance soil micronutrients should be relevant to studious declining yield under inorganic fertilizer effect. Nevertheless, the straw rate of 12 tha-1 supplying 0.58% of NPK as mineral fertilizer equivalent can be recommended for sustaining lowland rice production in the studied agro-ecosystems unless for three cropping seasons.

A Mechanism for Reversibly Pausing a Self-Immolation Cascade in Response to pH Changes

2019 ◽  
Author(s):  
Derrick Roberts ◽  
Ben S. Pilgrim ◽  
Tristan Dell ◽  
Molly Stevens
Keyword(s):  
Local Environment ◽  
Chemical Signals ◽  
Ph Sensitive ◽  
First Report ◽  
Ph Changes ◽  
Self Immolation

We describe the first report of a self-immolation cascade that can be reversibly paused and reactivated in response to pH changes. This system employs a triazole-based self-immolative linker, which expresses a pH-sensitive intermediate during its elimination sequence. This allows the system to respond to pH cues within its local environment, thus establishing a new way to gate self-immolative release using fluctuating or transient chemical signals.<br>

PENGARUH ZEOLIT DALAM PUPUK TERHADAP PERTUMBUHAN DAN PRODUKSI PADI SAWAH DI KABUPATEN BADUNG PROVINSI BALI

2013 ◽  
Vol 14 (3) ◽  
Author(s):  
Akhmad Jufri ◽  
Mochamad Rosjidi
Keyword(s):  
Field Experiment ◽  
Rainy Season ◽  
Rice Cultivation ◽  
Lowland Rice ◽  
Cultivation Practices

Many efforts are conducted to increase the fertilising efficiency, especially nitrogen in rice cultivation practices. This field experiment was conducted to evaluate the effect of zeolite on growth and production of lowland rice during rainy season in Badung, Bali. The experiment showed that fertilizer mixed with zeolite resulted in the same growth and productivity, although the fertilising doses was reduced. This means that zeolite incread fertilising efficiency in rice cultivation.

On-site and in situ bioremediation of wood-preservative contaminated groundwater

2000 ◽  
Vol 42 (5-6) ◽  
pp. 371-376 ◽  
Author(s):  
J.A. Puhakka ◽  
K.T. Järvinen ◽  
J.H. Langwaldt ◽  
E.S. Melin ◽  
M.K. Männistö ◽  
...  
Keyword(s):  
Iron Oxidation ◽  
Wood Preservative ◽  
Pilot Scale ◽  
High Rate ◽  
Contaminated Groundwater ◽  
Groundwater Temperature ◽  
In Situ Bioremediation ◽  
Contaminated Aquifer ◽  
Fluidized Bed Process

This paper reviews ten years of research on on-site and in situ bioremediation of chlorophenol contaminated groundwater. Laboratory experiments on the development of a high-rate, fluidized-bed process resulted in a full-scale, pump-and-treat application which has operated for several years. The system operates at ambient groundwater temperature of 7 to 9°C at 2.7 d hydraulic retention time and chlorophenol removal efficiencies of 98.5 to 99.9%. The microbial ecology studies of the contaminated aquifer revealed a diverse chlorophenol-degrading community. In situ biodegradation of chlorophenols is controlled by oxygen availability, only. Laboratory and pilot-scale experiments showed the potential for in situ aquifer bioremediation with iron oxidation and precipitation as a potential problem.

Introduction to geomicrobiology

2018 ◽  
Author(s):  
David L. Kirchman
Keyword(s):  
Fossil Fuels ◽  
Solid Phase ◽  
Direct Reduction ◽  
Iron Oxidation ◽  
Mineral Dissolution ◽  
Precipitation Process ◽  
Soluble Ions ◽  
Chemolithoautotrophic Bacteria ◽  
The Impact

Geomicrobiology, the marriage of geology and microbiology, is about the impact of microbes on Earth materials in terrestrial systems and sediments. Many geomicrobiological processes occur over long timescales. Even the slow growth and low activity of microbes, however, have big effects when added up over millennia. After reviewing the basics of bacteria–surface interactions, the chapter moves on to discussing biomineralization, which is the microbially mediated formation of solid minerals from soluble ions. The role of microbes can vary from merely providing passive surfaces for mineral formation, to active control of the entire precipitation process. The formation of carbonate-containing minerals by coccolithophorids and other marine organisms is especially important because of the role of these minerals in the carbon cycle. Iron minerals can be formed by chemolithoautotrophic bacteria, which gain a small amount of energy from iron oxidation. Similarly, manganese-rich minerals are formed during manganese oxidation, although how this reaction benefits microbes is unclear. These minerals and others give geologists and geomicrobiologists clues about early life on Earth. In addition to forming minerals, microbes help to dissolve them, a process called weathering. Microbes contribute to weathering and mineral dissolution through several mechanisms: production of protons (acidity) or hydroxides that dissolve minerals; production of ligands that chelate metals in minerals thereby breaking up the solid phase; and direct reduction of mineral-bound metals to more soluble forms. The chapter ends with some comments about the role of microbes in degrading oil and other fossil fuels.

Change of rH2 depending on iron oxidation byThiobacillus ferrooxidans and on mineral acid concentration

1977 ◽  
Vol 17 (3) ◽  
pp. 253-254
Author(s):  
D. Bracilović ◽  
F. Barbič ◽  
J. Živković
Keyword(s):  
Acid Concentration ◽  
Iron Oxidation ◽  
Mineral Acid

Effect of Water Depth on Nitrogen Use Efficiency and Nitrogen‐15 Balance in Lowland Rice 1

1987 ◽  
Vol 79 (2) ◽  
pp. 210-216 ◽  
Author(s):  
S. K. De Datta ◽  
W. N. Obcemea ◽  
R. Y. Chen ◽  
J. C. Calabio ◽  
R. C. Evangelista
Keyword(s):  
Water Depth ◽  
Nitrogen Use Efficiency ◽  
Lowland Rice ◽  
Nitrogen Use ◽  
Effect Of Water ◽  
Use Efficiency
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