POTASSIUM DYNAMICS IN SOILS UNDER COTTON BASED CROPPING SYSTEM OF NORTH KARNATAKA
| dc.contributor.advisor | Satyanarayana, Dr. T. | |
| dc.contributor.author | HIREKURABAR, B. M. | |
| dc.date.accessioned | 2019-11-03T05:00:45Z | |
| dc.date.available | 2019-11-03T05:00:45Z | |
| dc.date.issued | 1999-08-30 | |
| dc.description.abstract | Seventy two soil samples from eigtJiteen prollles belonging to order Vertisol under cotton based cropping system of Nortli Kamataka were collected to investigate distribution of forms of potassium, K content in soil textural fractions, K fixation and release characteristics and Quantity-Intensity ( Q/1 ) parameters of potassium in these soils. The range in contents of various forms of potassium in the soil profiles were 8.00 to 20.25 ppm, 102 to 285 ppm, 445 to 1125 ppm, 0.454 to 1.328 per cent, 0.523 to 1.460 per cent and 306 to 770 kg K2O ha-1 of water soluble, exchangeable, non-exchangeable, lattice, total and available potassium, respectively. The average contribution of water soluble, exchangeable,nonexchangeable and lattice K to total soil K varied from 0.09 to 0.30, 1.21 to 3.33, 5.97 to 11.90 and 85.00 to 92.30 per cent, respectively. The potassium content in coarse sand, fine sand, silt and clay ranged from 0.15 to 0.42 , 0.32 to 1.19, 0.46 to 1.33 and 0.63 to 1.65 per cent, respectively. The mean potassium contribution from coarse sand, fine sand, silt and clay towards total soil K were 3.85,5.36,22.86 and 67.93 per cent, respectively. The K fixation capacity of surface soils varied from 0.78 to 1.34 c.mol (p t-)kg-1. The per cent K fixation varied from 15.60 to 27.20. The cumulative K release, step-K and constant rate K values ranged from 537 to 1157, 400 to 747 and 13 to 44 ppm, respectively. The Q/I parameters viz.,AReK ,Kl ,Kx, Kq ,PBCK and - G values ranged from 1.45 to 3.10(ML-1) 10-3 0.80 to 1.30, 0.50 to 0.76, 0.30 to 0.54 c.mol (p+) kg-1/ ( ML -1 ) and 3421 to 3871 cal. respectively. The soils under present study were high in available and step-K. However, the crops may face deficiency of potassium due to lower immediately available K( AReK ). Hence, K fertilization is necessary to available K to cotton crop | en_US |
| dc.identifier.other | Th-5232 | |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810133943 | |
| dc.keywords | POTASSIUM DYNAMICS IN SOILS UNDER | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 266 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE | en_US |
| dc.sub | Soil Science and Agriculture Chemistry | en_US |
| dc.subject | null | en_US |
| dc.theme | COTTON BASED CROPPING SYSTEM OF NORTH KARNATAKA | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | POTASSIUM DYNAMICS IN SOILS UNDER COTTON BASED CROPPING SYSTEM OF NORTH KARNATAKA | en_US |
| dc.type | Thesis | en_US |