Ecology of deepwater rice-fields in Bangladesh 5. Mineral composition of the rice plant and other aquatic macrophytes

Hydrobiologia ◽  
1988 ◽  
Vol 169 (1) ◽  
pp. 57-67 ◽  
Author(s):  
J. A. Rother ◽  
B. A. Whitton
Keyword(s):  
Mineral Composition ◽  
Rice Plant ◽  
Aquatic Macrophytes ◽  
Rice Fields ◽  
Deepwater Rice

Ecology of deepwater rice-fields in Bangladesh 2. Chemistry of sites at Manikganj and Sonargaon

Hydrobiologia ◽  
1988 ◽  
Vol 169 (1) ◽  
pp. 23-30 ◽  
Author(s):  
B. A. Whitton ◽  
J. A. Rother ◽  
Ashit R. Paul
Keyword(s):  
Rice Fields ◽  
Deepwater Rice

ENVIRONMENTAL CHARACTERIZATION OF FLOODWATER IN EASTERN INDIA: RELEVANCE TO SUBMERGENCE TOLERANCE OF LOWLAND RICE

1999 ◽  
Vol 35 (2) ◽  
pp. 141-152 ◽  
Author(s):  
P. C. RAM ◽  
A. K. SINGH ◽  
B. B. SINGH ◽  
V. K. SINGH ◽  
H. P. SINGH ◽  
...  
Keyword(s):  
Rice Fields ◽  
Lowland Rice ◽  
Submergence Tolerance ◽  
Eastern India ◽  
Deepwater Rice ◽  
Field Surveys ◽  
Saturated Water ◽  
Rainfed Lowland ◽  
Water Profile

Floodwater was characterized through field surveys over three years in rainfed lowland and deepwater rice areas of Eastern India. Measurements focused on dissolved O2 and CO2, pH and irradiance during flash floods in rice fields. Over locations and time, dissolved O2 concentrations ranged from zero to 0.28 mol m−3 (0–1.1 times air-saturated water at 30 °C) while dissolved CO2 ranged from 0.28 to 1.96 mol m−3 (31–217 times air-saturated water). Floodwater pH varied from 6.6 to 9.7. Irradiance decreased with depth in the water profile to an extent depending on turbidity. Turbidity varied greatly over locations and time. The significance of these measurements in assessing rice submergence tolerance is discussed.

Ecology of deepwater rice-fields in Bangladesh 3. Associated algae and macrophytes

Hydrobiologia ◽  
1988 ◽  
Vol 169 (1) ◽  
pp. 31-42 ◽  
Author(s):  
B. A. Whitton ◽  
Abdul Aziz ◽  
B. Kawecka ◽  
J. A. Rother
Keyword(s):  
Rice Fields ◽  
Deepwater Rice

scholarly journals Action thresholds of Hortensia similis Walker and Draeculacephala soluta Gibbons (Homoptera: Cicadellidae) in rice in Valle del Cauca, Colombia

1969 ◽  
Vol 83 (1-2) ◽  
pp. 65-74
Author(s):  
Isabel C. Arciniegas ◽  
Alberto Pantoja ◽  
César García ◽  
Miriam C. Duque
Keyword(s):  
Rice Plant ◽  
Rice Fields ◽  
Action Thresholds ◽  
Valle Del Cauca

Action thresholds were calculated to be 1.7 H. similis and 1.9 D. soluta per rice plant. These densities are equivalent to 7,140 H. similis and 7,980 D. soluta per 10 sweeps. Densities equal to the action thresholds of these two species have not been observed in rice fields of Valle del Cauca, Colombia.

Methane emission from deepwater rice fields in Thailand

2000 ◽  
pp. 121-130 ◽  
Author(s):  
N. Chareonsilp ◽  
C. Buddhaboon ◽  
P. Promnart ◽  
R. Wassmann ◽  
R. S. Lantin
Keyword(s):  
Methane Emission ◽  
Rice Fields ◽  
Deepwater Rice

CHEMICAL COMPOSITION OF AQUATIC MACROPHYTES. III. MINERAL COMPOSITION OF FRESHWATER MACROPHYTES AND THEIR POTENTIAL FOR MINERAL NUTRIENT REMOVAL FROM LAKE WATER

1978 ◽  
Vol 58 (3) ◽  
pp. 851-862 ◽  
Author(s):  
A. JABBAR MUZTAR ◽  
S. J. SLINGER ◽  
J. H. BURTON
Keyword(s):  
Mineral Composition ◽  
Aquatic Plants ◽  
Aquatic Macrophytes ◽  
Myriophyllum Spicatum ◽  
Mineral Elements ◽  
Mineral Nutrient ◽  
Vallisneria Americana ◽  
Mineral Contents ◽  
Freshwater Macrophytes ◽  
Phosphorus Levels

Mineral composition of aquatic plants from Chemung Lake and Lake Ontario was investigated. The four species harvested at progressive dates in 1974 showed no trend of variation in their individual mineral contents. This was probably because some dates did not correspond with a specific growth stage. All the four species harvested at three dates, except Myriophyllum spicatum and Vallisneria americana collected in September, were extremely high in ash. Myriophyllum and Vallisneria harvested in September represented immature plants, since these were obtained from sites harvested previously and consequently were much lower in ash. Calcium and phosphorus levels varied with the ash content, with the former being the major cation in all species. Analyses of washed and unwashed samples of several macrophytes harvested in 1975 showed that extremely high ash was the result of surface calcification with CaCO3. Silica, Co, Cu and Se were present at safe levels for feeding to animals. Results indicated that harvesting aquatic plants has the potential to remove large quantities of mineral nutrients from the aquatic environment, and feeding good quality plants to herbivore and poultry could meet their requirements for many of the mineral elements.

scholarly journals Studies on mosquitoes (Diptera: Culicidae) and anthropicenvironment: 5- Breeding of Anopheles albitarsis in flooded rice fields in South-Eastern Brazil

1994 ◽  
Vol 28 (5) ◽  
pp. 329-331 ◽  
Author(s):  
Oswaldo Paulo Forattini ◽  
Iná Kakitani ◽  
Eduardo Massad ◽  
Daniel Marucci
Keyword(s):  
Plant Height ◽  
Rice Plant ◽  
Early Stage ◽  
Inverse Correlation ◽  
Rice Fields ◽  
Control Measures ◽  
Paddy Fields ◽  
Flooded Rice ◽  
South Eastern ◽  
Eastern Brazil

Studies on breeding Anopheles albitarsis and association with rice growth in irrigated paddy fields were carried out during the rice cultivation cycle from December 1993 to March 1994. This period corresponded to the length of time of permanent paddy flooding. Breeding occurred in the early stage up until five weeks after transplantation when rice plant height was small. That inverse correlation may give potential direction to control measures.

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