Development of phosphorus saturation indices for some selected soils of India
| dc.contributor.advisor | V. R, Ramakrishna Parama | |
| dc.contributor.author | I, Rashmi | |
| dc.date.accessioned | 2016-05-23T11:31:14Z | |
| dc.date.available | 2016-05-23T11:31:14Z | |
| dc.date.issued | 11-10-13 | |
| dc.description.abstract | The degree of P saturation (DPS) approach includes quantity and intensity parameter and thus plays an important role in estimating the potential capacity of soils to release P into environment. The investigation on “Development of phosphorus saturation indices for some selected soils of India” was carried out using Jabalpur, Delhi, Bangalore and Trivandrum soils with an objective of developing DPS indices using different extractants namely Olsen, Bray1 and 2, Mehlich3, AB-DTPA and Ammonium Oxalate to understand P movement and loss from agricultural soil. The four selected soils were incubated at 0, 25, 50, 100, 150, 200, 400 and 800 % of P sorption maxima and used for developing DPS indices with different extractants, column and pot study using maize as test crop. The experiment was undertaken during 2011-12 with complete randomized design including eight treatments and replicated thrice. The critical threshold DPS Ol-1, DPS M3-3, DPSA.O.-1 for Jabalpur and Delhi soil was 52.67 37.52, 19.9 % and 29.09, 15.57, 8.60 % resulting in reactive P (RP) concentration of 0.55 and 0.3 μg ml-1. Similarly, DPS By 1-1 DPS M3-2, DPSA.O.-1 for Bangalore and Trivandrum was 33, 128, 11.2 % and 45.92, 169.12, 10.21 % resulting in RP concentration of 0.12 and 0.14 μg ml-1. The environmental STP like WEP and CaCl2-P showed better correlation with RP concentration in leachate as compared to agronomic STP (Olsen, Bray, M3P, ABDTPA). The threshold value of DPS Ol-1, DPSA.O.-1 and DPS M3-3 for crop yield in Jabalpur and Delhi soils were 20.47, 11.7 and16.01 percent and 3.1, 1.22 and 2.51 per cent respectively. In case of Bangalore and Trivandrum soils threshold DPS M3P-2, DPS By1-1 and DPS A.O.-1 for yield was 4.94, 6.8 and 4 percent and 10.3, 16.18 and 6.66 per cent respectively. | en_US |
| dc.identifier.other | Th-10674 | |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/66205 | |
| dc.language.iso | en | en_US |
| dc.publisher | University of Agricultural Sciences, Bengaluru | en_US |
| dc.sub | Soil Science and Agriculture Chemistry | |
| dc.subject | extraction, concentrates, organic acid salts, yields, irrigation, inorganic acid salts, leaching, planting, fertilizers, crops | en_US |
| dc.these.type | Ph.D | |
| dc.title | Development of phosphorus saturation indices for some selected soils of India | en_US |
| dc.type | Thesis | en_US |