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H. M. Pushpa ¹, R. C. Gowda ², D. V. Naveen ¹, T. Bhagyalakshmi ¹, D. C. Hunumanthappa ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Chemistry, G.K.V.K., Bengaluru(KARNATAKA), IN
2 Department of Soil Science and Agricultural Chemistry, University of Agricultural Chemistry, G.K.V.K., Bengaluru (KARNATAKA), IN

Abstract

No Abstract

Keywords

Root biomass, Root length, Nutrient contents, Nutrient uptake

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H. M. Pushpa ¹, R. C. Gowda ¹, D. V. Naveen ¹, D. C. Hanumanthappa ¹, T. Bhagyalakshmi ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Chemistry, G.K.V.K., Benglauru, Karnataka, IN

Abstract

An experiment was conducted in long-term fertilizer experiment field at the ZARS,GKVK,Bangalore duringRabi 2010-11to find out the effect of continues applied fertilizers on maize ischolar_main biomass and nutrient addition through ischolar_main biomass. Long term fertilizer application showed significantly higher (12.94 q ha^-1) ischolar_main biomass and ischolar_main length (22.35 cm) in T₃ which received 150 % NPK followed T₈ and T₁₀ which received FYM and lime along with inorganic fertilizers showed a better results (12.65q ha^-1, 12.12q ha^-1 and 21.33cm, 19.73 cm, respectively). The higher major, secondary and micronutrients content in maize ischolar_mains were recorded in the T₃ which received super optimal doses of NPK fertilizers (150 % NPK) and also in the plots which received 100 % NPK + FYM + lime, respectively over control.The higher uptake of nutrients by ischolar_main biomass also showed similar results.

Keywords

Maize,ischolar_main Biomass, Long Term Experiment, Root Nutrient Content

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K. Rajan ¹, A. Natarajan ², V. Kasthuri Thilagam ¹, K. S. Anil Kumar ², D. Dinesh ¹, N. M. Alam ³, O. P. S. Khola ¹, R. C. Gowda ⁴

Affiliations
1 ICAR-Indian Institute of Soil and Water Conservation, Research Centre, Udhagamandalam 643 004, IN
2 ICAR-National Bureau of Soil Survey and Land Use Planning, Hebbal, Bengaluru 560 024, IN
3 ICAR-Indian Institute of Soil and Water Conservation, 218, Kaulagarh Road, Dehradun 248 195, IN
4 Department of Soil Science and Agricultural Chemistry, GKVK, University of Agricultural Sciences, Bengaluru 560 065, IN

Abstract

Effect of sodicity on clay dispersion in salt-affected black soils of the Kabini canal command area in Chamrajnagar district, southern Karnataka was studied. Forty-eight soil samples were collected from nine soil profiles and analysed for physical and chemical properties. The clay dispersion ranged from 0.57% to 62.1%. High positive and negative correlations with exchangeable sodium and exchangeable calcium respectively, with clay dispersion were recorded, which can be predicted better with exchangeable sodium and available soil water. Based on clay dispersion value, 2%, 27% and 71% soils are dispersive, intermediate dispersive and non-dispersive respectively. Based on exchangeable sodium percentage, 50, 21 and 29 soils are dispersive, intermediate dispersive and nondispersive respectively. Application of gypsum and organics reduces the clay dispersion in surface soil. Sub-surface drainage will be more effective. Construction of soil and water conservation structures with pile foundation; providing cement lining for soil stabilization in normal construction; providing drainage lines for the structures; construction after refilling with non-dispersive soil will save the structures in salt-affected soils.

Keywords

Clay Dispersion, Sodicity, Sub-Surface Effect, Surface Effect.

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Shruthi ¹, R. C. Gowda ¹

Affiliations
1 University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

An investigation was taken at the University of Agricultural Sciences, Bangalore during 2013 in order to characterize the soils coming under Alfisols of Bangalore rural district (Doddaballapura) of Karnataka with respect to physical and chemical properties. The predominant finger millet growing area Doddaballapura of Bangalore rural district was selected for the present study. Ten surface samples (0-15cm) were collected from area and analyzed for physical and chemical properties. This study leads us to the conclusion of the nutrient's quantity of soils of Doddaballapura taluk, Bangalore rural district, Karnataka State. Result show that overage all the soils of Doddaballapura taluk have various physical and chemical parameters. This information will help farmers to decide the problems related to soil nutrients and also amount of fertilizers to be added to soil to make production economic.

Keywords

Characterization of Soil Samples, Physical Parameter, Chemical Parameter.

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D. V. Naveen ¹, R. C. Gowda ¹, B. Mamatha ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Science, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

Field experiment was conducted at Zonal Agricultural Research center, Kathalagere, during Kharif 2008. To study persistence and residues of pyrazosulfuron-ethyl in soil and ground water in transplanted rice ecosystem were estimated using HPLC technique. Pyrazosulfuron-ethyl was applied at 25 g a.i. ha^-1 and 50 g a.i. ha^-1 with and without addition of recommended farm yard manure in transplanted rice. The study revealed that the residue of pyrazosulfuron-ethyl in soils ranged from 0.0103 and 0.0199 mg kg^-1, respectively with FYM at recommended and double the recommended dose on 2^nd day of application. And without FYM the residues were 0.0116 and 0.0229 mg kg^-1, respectively. The residues were detected up to 35 days only. The half-life of pyrazosulfuron-ethyl ranged from 16.6 to 21 days. The results revealed that the residues of pyrazosulfuronethyl were below the detectable level in the post harvest soil, paddy grain and straw. No residues of pyrazosulfuron-ethyl were detected in ground water up to two weeks after the application of pyrazosulfuron ethyl. After two weeks the residues were detected in ground water collected from both the piezometers which were applied with recommended and double the recommended dose of pyrazosulfuron-ethyl. The residues ranged from 0.0071 to 0.0042 mg kg^-1 between 21^st and 28^th day, respectively, after which the residues were below the detectable level both at recommended and double the recommended level of application. A maximum of 0.0154 mg kg^-1 on 21^st day and minimum of 0.0023 mg kg^-1 of pyrazosulfuron ethyl residues on 35^th day were detected in the underground water.

Keywords

Pyrazosulfuron-Ethyl, Half-Life, HPLC.

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D. V. Naveen ¹, R. C. Gowda ¹, T. H. Hanumantharaju ¹, T. Bhagyalakshmi ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Science, G.K.V.K., Bengaluru (Karnataka), IN

Abstract

Sorption studies were conducted with pyrazosulfuron-ethyl using batch equilibration technique and HPLC analysis. Four different paddy growing soils of Kathalagere, Mandya, Mudigere and Mangalore soil of Southern transitional zone, Southern dry zone, Hilly zone and Coastal zones of Southern Karnataka were used in the study with a pH of 7.3, 6.9, 6.1 and 5.8 and organic matter (g kg^-1) of 12.9, 10.9, 6.4 and 10.4, respectively. The sorption isotherm (n) values were 0.104, 0.101, 0.085 and 0.165 for Kathalagere, Mandya, Mudigere and Mangalore soils, respectively. The sorption isotherm for pyrazosulfuron-ethyl was non-linear in all soils, as explained by the Freundlich equation (n < 1.0), indicating differential distribution of site energies for sorption. In general adsorption isotherms fitted well with Freundlich equation (r^-2 > 0.96), and Freundlich constants 'K', 'Koc' and 'K_c' values were in the range from 5.45 to 9.52, 1099.46 to 1436.12 and 32.24 to 49.07 in different soils and described in the order of Kathalagere > Mandya > Mudigere > Mangalore, which is also in the order of decreasing organic matter content in the soils. The coefficient of determination showed an improvement up to 96 per cent using quadratic functions, suggesting a better goodness of fit in preceding pyrazosulfuron-ethyl sorption compared to the linearised form of the Freundlich equation. The cumulative desorption of five days of pyrazosulfuron-ethyl in these soils were determined and it ranged from 22.3 to 41.1 mg kg^-1 in Kathalagere soil, 25.6 to 49.4 mg kg^-1 in Mandya soil, 37.1 to 51.9 mg kg^-1 in Mudigere soil and 39.9 to 55.7 mg kg^-1 in Mangalore soil. The desorption was also in decreasing order of Mangalore > Mudigere > Mandya > Kathalagere soils. The sorption of pyrazosulfuron-ethyl increased with increasing organic matter content and was significantly correlated with organic matter content of the soils where as clay content did not greatly affect the sorption as indicated by low regression coefficient.

Keywords

Pyrazosulfuron-Ethyl, Sorption, Freundlich Equation, HPLC.

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