Research Papers Published by DBB
Table 3 : Showing the extent and type of damage due to atmospheric fluoride pollution to the leaves of different plants in different parts of line transect.
Table 4 : Monthly variations in the fluoride concentration of forage, feed supplement and urine of cows maintained within a radius of 3.5 to 1.0 km of the aluminium factory.
| Name of the plant | Part of Transect (m) | Type of damage | Amount of damage to leaves |
| Mangifera indica | 0-100 | Margin burning and chlorosis | H |
| 400-500 | None | - | |
| Datura alba | 0-100 | Margin burning | S |
| 200-300 | Tip and margin burning | M | |
| Pongamia glabra | 0-100 | Spotting, tip burning and chlorosis | M |
| 100-200 | Bleaching, chlorosis and margin burning | H | |
| 200-300 | Spotting | M | |
| Bougainvillaea spectabilis | 0-100 | Margin burning and spotting | S |
| 200-300 | -do- | S | |
| 300-400 | -do- | S | |
| Canna indica | 100-200 | Margin and tip burning | M |
| 300-400 | Chlorosis and necrosis | M | |
| Michelia champac | 0-100 | Margin and tip burning | S |
| Amaranthus spinosus | 0-100 | Margin burning and chlorosis | S |
| Millingtonia hortensis | 0-100 | Spotting | S |
| Ixora parviflora | 0-100 | Chlorosis and margin burning | M |
| Euphorbia nerifolia |
0-100 | None | - |
| Polyalthia longifolia | 0-100 | Margin and tip burning | M |
| Caryota urens | 0-100 | Chlorosis | H |
| Jasminum pubescens | 0-100 | Chlorosis and necrosis | H |
| 100-200 | Margin and tip burning | M |
| Name of the plant | Part of Transect (m) | Type of damage | Amount of damage to leaves |
| Adhatoda vasica | 0-100 | Margin and tip burning | M |
| Parthenium histeroflorus | 0-100 | Bleaching | M |
| 200-300 | Bleaching | S | |
| 300-400 | None | - | |
| Launeaea nudicaulis | 0-100 | None | - |
| Tradescantia verginiana | 0-100 | Bleaching | M |
| Cucurbita maxima | 200-300 | Chlorosis | H |
| Tinospora corqifolia | 200-300 | Chlorosis | M |
| Cocos nucifera | 200-300 | Margin & tip burning |
M |
| Musa paradisiaca | 200-300 | -do- | M |
| 300-400 | -do- | S | |
| lpomoea fistilata | 300-400 | Spotting | S |
| Lantana camera | 300-400 | Margin & tip burning | H |
| Anona raticulata | 300-400 | Tip burning | S |
| Colocasia antiquorum | 300-400 | Chlorosis | S |
| Moringa oleifera | 300-400 | None | - |
| Casia fistula | 300-400 | None | - |
| 400-500 | None | - | |
| Erythrina indica | 300-400 | None | - |
| Casia tora | 100-200 | Tip burning & chlorosis | M |
| 400-500 | Tip burning | S | |
| Tamarindus indica | 400-500 | Margin & burning | M |
| Zea mays | 400-500 | None | - |
| Achyranthes aspera | 400-500 | None | - |
| Vitex negundo | 400-500 | None | - |
| Jatropha nana | 400-500 | None | - |
| Cyncdon dactylon | 400-500 | None | - |
| Syzygium cumini | 100-200 | Margin & tip burning | M |
| Legend : H = 75% or more; M = 50 to 75% damage and S = 25 to 50% damage. | |||
Table 4 : Monthly variations in the fluoride concentration of forage, feed supplement and urine of cows maintained within a radius of 3.5 to 1.0 km of the aluminium factory.
| Month | Fluoride concentration (ppm) | ||
| Forage | Feed supplement | Urine | |
| July 1972 | 25.0 | 18.5 | 15.5 |
| August | 31.0 | 22.0 | 20.0 |
| September | 49.0 | 16.4 | 24.0 |
| October | 97.0 | 21.8 | 23.0 |
| November | 116.0 | 32.6 | 31.0 |
| December | 195.0 | 28.0 | 34.2 |
| January 1973 | - | - | - |
| February | 142.0 | 20.0 | 29.0 |
| March | - | - | - |
| April | 55.0 | 41.0 | 24.0 |
| May | - | - | - |
| June | 38.0 | 46.0 | 20.0 |