Pandey, R.N. and Girish, B.H. (2007) Extractants and critical limits of available soil sulphur for maize (Zea mays L.). Journal of the Indian Society of Soil Science, 55 (3). pp. 304-312.
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Abstract
Pot experiments were conducted for two years using twenty-four soils, representing major soil orders of India to assess the suitability of fourteen extractants for establishing critical limits of deficiency of available soil sulphur for maize (Zea mays L.). The soils were extracted with 0.15% CaCl2.2H2O, 500 mg P L-1 Ca (H2PO4)2.H2O, Wolf, Mehlich-2, Mehlich-3, Mehlich-3 + charcoal, modified calcium chloride (0.15% CaCl2.2H2O + 0.5M CH3COONH4 + 0.5M CH3COOH), 0.25M KCl at 40 °C, 0.25M KCl at 50 °C, 0.25M KCl at 50 °C + charcoal, 0.25M KCl at 60 °C, 0.25M KCl at 60 °C + charcoal, 500 mg P L-1 KH2PO4 and 0.125M KCl + 0. 075% CaCl2.2H2O at 50 °C extractants. The extractable/available soil sulphur content of soils studied varied widely by different extraction methods. The results showed that soil sulphur contents extracted by 0.15% CaCl2.2H2O, 0.25M KCl 3hr 40 °C, 0.25M KCl 3hr 50 °C and 0.25M KCl 3hr 50 °C + charcoal was correlated significantly with most of the plant parameters of maize. The soil sulphur content extracted by 500 mg P L-1 Ca(H2PO4)2.H2O, Wolf, Mehlich-2, Mehlich-3, Mehlich-3 + charcoal, modified CaCl2.2H2O, 500 mg P L-1 KH2PO4 and 0.125M KCl + 0.075% CaCl2.2H2O 3hr 50 °C provided non-significant correlation with most of the biological indices of maize, indicating that these extractants are not suitable for the prediction of sulphur availability to maize. The critical limits of extractable/available soil sulphur for maize by promising extractants namely, 0.15% CaCl2.2H20, 0.25M KCl at 50 °C, 0.25 M KCl at 50 °C + charcoal and 0.25M KCl at 40 °C, were found to be 8.33, 9.14, 7.73 and 13.30 mg S kg-1 soil, respectively. The critical tissue sulphur concentration in maize plant was found to be 1120 mg kg-1 (0.112%) on dry weight basis. For the maize 0.15% CaCl2.2H20, 0.25M KCl at 50 °C and 0.25M KCl at 50 °C + charcoal could be recommended as more suitable soil sulphur extractants followed by 0.25% KCl at 40 °C.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi, 110 012 |
| Subjects: | Soil Science and Microbiology > Soil Sciences |
| Divisions: | Maize |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 17 Jan 2011 18:04 |
| Last Modified: | 17 Jan 2011 18:04 |
| Official URL: | http://www.indianjournals.com/ijor.aspx?target=ijo... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1381 |
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