EFFECTS OF AMENDMENTS, DRAINAGE AND RICE GROWTH ON SODIC SOIL RECLAMATION
| dc.contributor.advisor | PRATT, P F | |
| dc.contributor.author | PUTTASWAMY GOWDA, BYADARAHALLY SIDDEGOWDA | |
| dc.date.accessioned | 2019-10-04T17:07:46Z | |
| dc.date.available | 2019-10-04T17:07:46Z | |
| dc.date.issued | 1972 | |
| dc.description.abstract | The effects of straw and CaCl2 during 130 days of submergence, and effects of these amendments under submerged aerobic vs anaerobic conditions for a period of 30 days were studied by comparing the pH, EC, Na, Ca + Mg, K, Fe, the optical density of the water extract and the ESP. The straw and straw + CaCl2 treatments had the largest effect in lowering the pH and ESP, increasing the Na and Ca + Mg and the EC, Submerged anaerobic conditions had the largest effect on promoting these reactions. The concentration of Fe was highest in the straw treatments whereas CaCl2 had a depressing effect on the soluble Fe++ The optical density of water extracts was lowest in the straw + CaCl2 treated soil and the effect of this treatment was larger under anaerobia conditions. Wheat straw under anaerobic conditions caused an increase in the sum of Na + Ca + Mg in the soil solution that was about three times greater than the sum of these cations in the straw itself. In combination with CaCl2 wheat straw reduced the loss of Ca from solution. The mechanisms involved in the process of reclamation of a sodic soil under submerged condition while using straw or organic manures as amendments seems to be (a) decomposition of organic matter, release of salts and evolution of CO2 and certain organic acids, (b) lowering of pH and release of cations by solubilization of CaCO2 and other soil minerals thus increasing the EC, (c) replacement of exchangeable Na by Ca and Mg and lowering of the ESP. Submerged anaerobic conditions were found to be optimum for this process. In a greenhouse pot-culture study, effect of organic amendments on the reclamation of a saline sodic soil material under submerged conditions were studied with and without presence of a rice crop. In drained soils, application of dairy manure, sugar, straw or straw plus CaCl2 increased the rate of drainage, and decreased the EC and ESP. Without drainage, treatments were less effective. Crop growth hastened the reclamation process by increasing the volume of water drained and the concentration of Ca + Mg in the drainage water. Drainage had a significant effect in increasing the vegetative growth of rice, percentage of ear-bearing tillers, straw and grain yield. In the undrained condition, organic soil amendments, except dairy manure, adversely affected the straw and grain yield, and sugar severely affected the establishment of transplanted seedlings. | en_US |
| dc.identifier.citation | No. of references 48 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810130277 | |
| dc.keywords | Anaerobic, Erlenmeyer, Flasks, Suspensions, Aerobic | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 73p. | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE | en_US |
| dc.research.problem | EFFECTS OF AMENDMENTS, DRAINAGE AND RICE GROWTH ON SODIC SOIL RECLAMATION | en_US |
| dc.sub | Soil Science | en_US |
| dc.subject | null | en_US |
| dc.theme | EFFECTS OF AMENDMENTS, DRAINAGE AND RICE GROWTH ON SODIC SOIL RECLAMATION | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | EFFECTS OF AMENDMENTS, DRAINAGE AND RICE GROWTH ON SODIC SOIL RECLAMATION | en_US |
| dc.type | Thesis | en_US |