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Available K stock of two major soil regions (alluvial and shrink-swell soils) in India

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Title Available K stock of two major soil regions (alluvial and shrink-swell soils) in India
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Creator Bhattacharyya, T., Pal, D.K., Chandran, P., Ray, S.K., Durge, S.L. and Wani, S.P.
 
Subject Available K stock, soil regions, alluvial, shrink-swell, India
 
Description Not Available
In the past considerable efforts were made and estimate the total and available potassium of soils of different states of the country. The results of these efforts indicate that the alluvial soils contain the lowest amount of available K2O (471, kg ha-1) and the black soils the highest amount (844, kg ha-1). (Grewal and Kanwar, 1966; Dhawan et al., 1968; Verma & Verma, 1968).
Two maps were earlier prepared by Oommen (1959) one for total potassium, and the other for available potassium using the data from different sites of India. The total potassium was reported high (3722 kg ha-1 K2O) and available K2O was low to medium (below 112 kg ha-1 K2O, and in a few cases 112-280 kg ha-1 K2O). Ramamoorthy and Bajaj (1969) prepared a map of available potassium based on results of soil testing services of nearly 200 districts. They reported that the soils in 36 districts were low, 110 districts were medium and 50 districts showed high status of K. The soils of the Indo-Gangetic alluvium (IGP) and the soils bordering the Vindhyan system are low in available potassium. Whereas the soils of the crystalline gneiss or the Gondwana system have high available K.
Most of the studies made so far has estimated the available K on the basis of selected soils limited to surface layer only. Information on potassium reserve in various depths of Indian soils is rare. On the basis of large number of soil series identified by the National Bureau of Soil Survey and Land Use Planning, Nagpur, the present study was undertaken to find out the available K stock of soils of two important zones of India. These zones are the Indo-Gangetic Plains, India (IGP) and the associated Red and Black Soil Region (BSR). Total 40 Benchmark soils (BM) from the IGP and 208 from the BSR were analysed in terms of the bulk density (BD), and available K (ammonium acetate extractable) to carry out this work. The size of potassium stock is calculated following two steps. The first step involved determination of extractable K and then multiplying these values with bulk density and thickness of horizon for individual soil profile varying from 0-30, 0-50, 0-100 and 0-150 cm. In the second step the total K content determined by step one was multiplied by the area of each benchmark soil distributed in different bio-climatic systems. The total K stock was calculated in terms of Tg (Teragram, 1Tg=1012g).
The available K stock in four different soil depths for IGP and BSR is shown in table 1. The available K reserve is 160 and 427 Tg in the first 150 cm depth of soil. While comparing available K in two different soil regions, was noticed that in the first 30 cm depth more than 80 percent potassium is stored in BSR than IGP in one hectare area. The probable reason could be due to mining of K through extensive agricultural activity in the surface soils of the IGP. The IGP has been over-exploited over years and more so, after the green revolution. In contrast, the rainfed areas of the BSR have been less exploited as reflected in more K in the red and black soils than the soils of IGP. The present study with much wider soil database thus gives a better picture of the K health of soils in these two important soil regions of the country.
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Date 2020-06-30T15:48:22Z
2020-06-30T15:48:22Z
2006-11-22
 
Type Presentation
 
Identifier Bhattacharyya, T., Pal, D.K., Chandran, P., Ray, S.K., Durge, S.L. and Wani, S.P. (2006). Available K stock of two major soil regions (alluvial and shrink-swell soils) in India, International Symposium on Balanced Fertilization for Sustaining Crop Productivity, 22-25 November, 2006, Ludhiana, India, Vol. II: Extended Abstract, pp. 64-65.
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http://krishi.icar.gov.in/jspui/handle/123456789/37757
 
Language English
 
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Publisher Not Available