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Asian Journal of Crop Science

Year: 2015 | Volume: 7 | Issue: 1 | Page No.: 34-47
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Authors

Jiratchaya Saenya

Somchai Anusontpornperm

Suphicha Thanachit

Irb Kheoruenromne

Keywords

A study was conducted to characterize seven areas of paddy soils in Si Sa Ket province, northeast Thailand and to evaluate their potential for jasmine rice production. Field soil survey, soil sampling with respect to genetic horizons and soil analyses were undertaken basing on standard procedures. All soils were Ultisols (Korat (Kt1, Kt2), Roi Et (Re1, Re2), Ubon (Ub) and Thatum (Tm) soil series) with one Alfisol (Phimai soil series, Pm). All soils were deep with poorly drained feature but varied in properties. Their suitability for paddy rice cultivation was moderately (Pm soil) to marginally suitable (Kt1, Re2, Ub and Tm soils) with Kt2 and Re1 soils, both being unsuitable but potentially suitable (N1sn). Soil texture(s) was the major restriction of most soils of which loamy sand to sandy loam topsoil induced rather rapid water infiltration rate and a risk of moisture shortage. There were no soils that had a salinity problem despite reports suggesting a stress induced by soluble salts in soils was essential for jasmine rice to produce fragrant substance. Basing on gained yield data collected which varied from 2.41-2.98 t ha-1, all soils were tentatively suitable for jasmine rice, Khao Dok Mali 105 variety. The highest yield was in Pm soil that was slightly higher than that grown on Tm soils (2.94 t ha-1). These amounts of yield were higher than the potential yield of this variety (2.28 t ha-1). This might be due to the impact of management and it indicated that suitability assessment for paddy rice in general cannot be used to evaluate the potential of these paddy soils for growing jasmine rice. The tentative suitability class for this variety should be in better classes according to this study. Nonetheless, low soil moisture retention capacity in addition to low fertility status of the soils needs to be emphasized. Thus, these soil constraints should be designated in the suitability class for growing jasmine rice on these soils in order to provide basic information and sustainable use.
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