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Siva Prasad, P. N.
- Comparison of Extraction Methods to Assess Potassium Availability for Rice Growing Soils of Canal Ayacut of Kurnool District
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Authors
Affiliations
1 Division of Soil Science and Agricultural Chemistry, Agricultural College (A.N.G.R.A.U.), Mahanandi (A.P.), IN
2 Division of Soil Science and Agricultural Chemistry, Agricultural Research Station (A.N.G.R.A.U.), Utukur, Kadapa (A.P.), IN
3 Division of Agronomy, Agricultural College (A.N.G.R.A.U.), Mahanandi (A.P.), IN
1 Division of Soil Science and Agricultural Chemistry, Agricultural College (A.N.G.R.A.U.), Mahanandi (A.P.), IN
2 Division of Soil Science and Agricultural Chemistry, Agricultural Research Station (A.N.G.R.A.U.), Utukur, Kadapa (A.P.), IN
3 Division of Agronomy, Agricultural College (A.N.G.R.A.U.), Mahanandi (A.P.), IN
Source
An Asian Journal of Soil Science, Vol 11, No 1 (2016), Pagination: 67-73Abstract
Eighty surface soil samples were collected from rice growing areas of Kurnool district covering eleven mandals and among them thirty samples were selected for the investigation based on K status. Among the extractants tried, the relative efficiency of K releasing extractants were in the following order of 1 N HNO3 > Mehilich-3 > 0.2 M NaBPh<>sub>4 > 1 N NH4OAc > AB-DTPA > 0.02 M citric acid > 0.01MCaCl2 > distilled water. Results revealed that, highest amount of K was extracted by 1 N HNO3 and lowest by distilled water. A pot experiment by biological Neubauer's seedling technique method was conducted to assess the releasing pattern of available K with bajra, as test crop. Among the various extractants tried, 1 N HNO3 served as a better index of available K as it is highly positively correlated with dry matter yield and uptake with the shoot K content (r=0.353).Keywords
Available K, Mehlich-3, NN NH4OAc, AB- DTPA, NaBPh4, Neubauer’s Seedling Technique.
References
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- Study of Dynamics of Electro-Chemical Properties of Submerged Soils
Abstract Views :187 |
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Authors
Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences (G.K.V.K.), Bengaluru (Karnataka), IN
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences (G.K.V.K.), Bengaluru (Karnataka), IN
Source
An Asian Journal of Soil Science, Vol 11, No 1 (2016), Pagination: 74-77Abstract
Wetland rice systems in Asia make a major contribution to global rice supply. The system is also able to maintain soil fertility on a sustainable basis. The essential components of wetland rice culture comprise cultivation of land in the flooding, puddling and transplanting of rice seedlings into puddled rice paddies, and growing the rice crop under flooding. The wetland rice system, growing rice in submerged soils has a great ameliorative effect on chemical fertility: largely by bringing pH in the neutral range, resulting in better availability of plant nutrients and accumulation of organic matter. Submergence bring a lot changes in redox potential which in turn gives the idea of reduction of nutrients to release to soil solution to make available to plant. This article revealed the dynamic changes of soil pH, electrical conductivity and Redox potential on submergence.Keywords
Flooding, Submergence, Soil pH, Electrical Conductivity, Redox Potential.References
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- Sahrawat, K.L. (2005). Fertility and organic matter in submerged rice soils. Curr. Sci., 88(5):735-739.
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