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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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Thesis Type: M.Sc × Subject: Agronomy × Author: A.S.Policepatil × Type: Thesis ×
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    ThesisItemOpen Access
    Performance of bt-cotton hybrids as influenced by site specific nutrient management approach for realising target yields
    (UAS, Dharwad, 2007) A.S.Policepatil; B.M.Chittapur
    A field experiment was conducted at Main Agricultural Research Station, UAS, Dharwad, during 2006-07 to study the performance of Bt-cotton hybrids as influenced by site specific nutrient management approach for realising target yields. Experiment consisted of four Bt-cotton hybrids (MRC-6322, MRC-6918, MRC-7351 and MRC-7201) and three nutrient levels (F1 - 145:39:99; F2 -181:49:124; and F3 - 217:59:148 N P2O5 K2O kg ha-1) for target yields of 2.0, 2.5 and 3.0 t ha-1 was laid out in RCBD. Among Bt-cotton hybrids, MRC-6322 recorded significantly higher dry matter production, LA, LAI, number of sympodial branches, number of bolls, nutrient uptake and seed cotton yield (3286 kg ha-1) over MRC-6918, however and was on par with MRC-7351 and MRC-7201. Seed cotton yield increased with increase in the fertilizer levels targeted from 2.0 to 3.0 t ha-1. Improvement in seed cotton yield was in the order of 63.90, 15.60 and 7.30 per cent over their respective target yield levels. Significantly higher seed cotton yield was recorded with F3 (3219 kg ha-1) level over F1 (2738 kg ha-1) level. However, F2 (2891 kg ha-1) level was on par with F3 level. At different levels of fertilizer for target yields, MRC-6322 recorded higher seed cotton yield (3062, 3067 and 3730 kg ha-1) than the other cotton hybrids. It also recorded significantly higher gross returns (Rs.83067/-ha-1), net returns (Rs.65620/-ha-1) and B: C ratio (3.76) at F3 level. Among different Bt-cotton hybrids, MRC-7201, recorded significantly higher deltaendotoxin concentration (1.97 μg g-1 fw) than other cotton genotypes except MRC-7351. Delta-endotoxin concentration (2.04 μg g-1 fw) was the highest at F3 level. MRC-6918 accounted for lower delta-endotoxin concentration irrespective of fertilizer levels among the genotypes tried.