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University of Agricultural Sciences, Dharwad

The University of Agricultural Sciences, Dharwad was established on October 1, 1986. The University has 5 Colleges, 27 Research Stations, 6 Agriculture Extension Education Centers, 6 Krishi Vigyan Kendras and ATIC. The University has its jurisdiction over 7 districts namely Bagalkot, Belgaum, Bijapur, Dharwad, Gadag, Haveri, and Uttar Kannada in northern Karnataka. Greater diversity exists in soil types, climate, topography cropping and farming situations. The jurisdiction includes dry-farming to heavy rainfall and irrigated area. Important crops of the region include sorghum, cotton, rice, pulses, chilli, sugarcane, groundnut, sunflower, wheat, safflower etc. The region is also known for many horticultural crops. Considerable progress has been registered in the field of education, research and extension from this University.

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Subject: Soil Science and Agricultural Chemistry × Start date: 2005 × End date: 2009 × Author: D.N.Samaraweera × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Studies on forms and Transformation of Sulphur and Response of Rice to Sulphur Applicatiobn in Rice-Rice Cropping esequence
    (UAS Dharwad, 2009) D.N.Samaraweera; H.T.Channal
    Soil characterization, incubation study and field experiments were conducted to study the distribution of S forms, transformation and direct and residual effect of sulphur on growth, yield and quality of rice-rice cropping system during rabi/summer and kharif seasons during 2007, respectively. In characterization study, there was lot of variations among sulphur forms in soils of eight selected locations. Correlation studies revealed that sulphate sulphur was significantly and positively correlated with EC and CEC, water soluble sulphur, organic sulphur and total sulphur. Water soluble sulphur significantly correlated with pH, EC, organic sulphur, non-sulphate sulphur and total sulphur. Results obtained from incubation study revealed that Factomphos increased sulphate sulphur and water soluble sulphur up to 32nd day of incubation and these fractions declined thereafter. Field investigations on response of rice to applied two sulphur sources indicated that Facomphos was superior over gypsum and the highest grain and straw yield (57.09 and 63.63 q ha-1), protein and methionine content (6.17% and 2.51 mg g-1) were recorded with Factomphos apllied @ 50 kg ha-1, respectively. In succeeding rice, same treatment registered highest grain and straw yield (51.90 and 58.02 q ha-1), protein and methionine content (5.92% and 2.18 mg g-1), respectively. Economic analysis revealed that application of Factomphos @ 50 kg ha-1 resulted the highest benefit:cost (B:C) ratio of 1.69 in first rice with net return of Rs. 16,847/ha which was 33.2 per cent increase over control (Rs. 12647/ha). Similarly, the highest benefit:cost (B:C) ratio of 1.64 in succeeding rice with net return of Rs. 14,565.00/ha was recorded with the residual effect of the same treatment and that was 55.9 per cent increase over control (Rs. 9343/ha).