Sulphur fractions, distribution, and their relationships with soil properties in different soil types of major pulse-growing regions of India
2004
Srinivasarao, C. | Ganeshamurthy, A.N. | Ali, M. | Singh, R.N. | Singh, K.K.
Sulphur (S) deficiency is widespread in Indian soils, and it has been emerging as a major limitation increasing pulse (grain legumes) productivity. The present study deals with distribution of S fractions, and their relationships with soil properties were studied in 10 profiles representing different soil types of pulse-growing regions of India. Despite continuous pulse cultivation, all the profiles showed low organic-carbon content. Profile mean values of different fractions of S ranged namely from total S from 241 to 391 mg kg(-1), organic S from 191 to 362 mg kg(-1), adsorbed S from 12.9 to 59.0 mg kg(-1), and available S from 3.5 to 9.2 mg kg(-1). Larger organic and total S was observed in Vertisols, followed by Inceptisols and Alfisols, whereas adsorbed S was higher in Alfisols. Organic S constituted 81-95% of total S. Plant available S showed significant positive correlation with organic and total S fractions in the profiles. Among soil properties, pH and EC showed negative correlation with plant available S in surface layer (0-30 cm), whereas there was a positive correlation with organic carbon in the lower layer (30-60 cm) of soil profile.
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