Status of Cobalt in Soils of Bihar Plateau And Response of Forage Crops to Its Application
| dc.contributor.advisor | Dr.H. K. Roy | |
| dc.contributor.author | Binod Kumar | |
| dc.date.accessioned | 2024-07-05T06:32:04Z | |
| dc.date.available | 2024-07-05T06:32:04Z | |
| dc.date.issued | 1998 | |
| dc.description.abstract | Studies were undertaken in soils belonging to 4 major Soil series of the plateau region namely Debatoli (Ranchi), Bandhi (Singhbhum), Pusaro (Dumka) and Karaya (Dumka) to study the status of Co in soils, establish the threshold level of Co in soil and plant and response of forage crops to Co application. Results show that available (DTPA extractable) Co content of Debatoli, Bandhi, Pusaro and Karaya series varied from 0.01-2.88, 0.11-2.04, 0.03-2.53 and Tr.-3.91 mg kg¹ with mean values of 0.95, 0.59, 0.84 and 1.81 mg kg, respectively. Soils of Karaya series had highest available Co content while this was lowest in Bandhi, series. With respect to cationic micronutrients, such as Zn, Cu, Mn and Fe, not much variation among the soil series was recorded. Available Co was significantly and positively correlated with clay (0.223**), Zn (0.205**), Cu (0.495**), Mn (0.378**) and Fe (0.413**) and negatively correlated with pH (-0.167) and sand (-0.155). However, Co availability in soil was not related with organic carbon and silt content of soils. Adsorption study conducted in soils after harvest of lucerne (Medicago sativa L) crop indicated that Cobalt adsorption increased with increasing concentrations of added Co but the nature of adsorption isotherm varied among soils. The magnitude of Co adsorption varied from 85.31 to 336.51 ug g¹ in these soils. It was highest in control plot containing fairly high amount of Mn and Fe and the lowest in the plot which received 10.0 kg Co ha¹. Freundlich constants such as adsorption capacity (k) rate of Co adsorption ranged from 17.37-43.65 and 0.219 to 0.398, respectively in these soils. The rate of adsorption was significantly correlated with available Co (-0.906") and yield of lucerne (0.925"). Langmuir constant such as adsorption maxima and bonding energy constant varied from 357.14 to 833.33 µg g¹ and 7.79 X 10 to 35.00 X 10 ml µg ¹, respectively in these soils. Supply parameter of Co in these soils ranged from 3.92 to 6.23. It was highest in the treatment in which 1.0 kg Co ha-¹ was applied and lowest in the treatment in which 10.0 kg Co ha¹ was applied. The desorption of Co increased with graded levels of added Co. It ranged from 7.01 to 28.66 µg g¹ soil. Pot experiments indicated that the response of stylo (Stylosanthes guianensis) to Co was highest at 2.5 mg Co kg¹ soil. The response to Co application was more (about 47%) in Co deficient than that in Co sufficient soils (38%). The uptake of Co also followed similar trend. Critical limits as determined in soils using stylo as test fodder crop, gave a value of 0.238 mg kg-¹ in soils and 2.3 mg kg-¹ in plants. Field experiment to study the influence of Co on the yield and uptake of Co and other cationic micronutrients by forage crops indicated significant increase in yield and uptake of Co with an increase in application of Co upto 1.0 kg Co ha¹ by lucerne in 1st cutting beyond which a reduction was noted. The reduction in yield and Co uptake by crops at 10.0 kg ha-¹ level was considerable where it produced even lower yield than the control plot. Uptake of Zn, Cu, Mn and Fe, however, decreased significantly with increased application of Co. Similar trend was also observed in the 2nd and 3rd cuttings of lucerne. In oats (Avena sativa L), the yield and uptake of Co increased significantly with an increase in application of Co upto 5.0 kg ha-¹ and thereafter reduction was noted. The availability of Co and other micronutrients determined after harvest of crops showed significant increase in available Co level with increased application of Co but reverse trend was noted with other micronutrients. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810211482 | |
| dc.language.iso | English | |
| dc.pages | 92 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Soil Science and Agriculture Chemistry | |
| dc.theme | Status of Cobalt in Soils of Bihar Plateau And Response of Forage Crops to Its Application | |
| dc.these.type | Ph.D | |
| dc.title | Status of Cobalt in Soils of Bihar Plateau And Response of Forage Crops to Its Application | |
| dc.type | Thesis |