The field experiment entitled “Impact of Nitrogen and Silicon application on yield and relative economics of transplanted rice under temperate conditions” was conducted at Agronomy Research Farm of Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir during Kharif seasons 2014-2015. The soil of the experiment was silty clay loam in texture, neutral in reaction with medium available nitrogen (442.88kg ha-1), phosphorus (9.3kg ha-1), potassium (221.60kg ha-1) and low available silicon (280.23kg ha-1). The experiment was laidout in Factorial Randomized Completely Block Design assigning combinations of three nitrogen levels viz. 120, 150 and 180N kg ha-1 and four silicon levels viz. Control, 5%, 10% and 15% Si with four replications. The results revealed that higher grain yield (76.00q ha-1), straw yield (93.97q ha-1) and harvest index (44.84%) were recorded with 120Nkgha-1. So far as silicon levels are concerned, 15%Si observed higher grain yield (76 q ha-1), straw yield (93.97 q ha-1) and harvest index (44.84%). Relative economics revealed that 120Nkgha-1 with 15%Si realized higher benefit cost ratio (Rs. 2.12).
This study on the biology of diamond back moth revealed that the incubation period varied from 2 to 5 days (3.6 ± 1.34 days), while first, second, third and fourth instar larvae lived for 3 ± 1, 1.6 ± 0.54, 2.6 ± 0.54 and 4 ± 0.70 days, respectively with a total larval period of 11.4 ± 1.81 days. The prepupal and pupal stage lasted for 2 ± 0.70 and 4.4 ± 0.89 days, respectively. The adults lived for 5 ± 1.58 days and the life span of male and female varied from 22.6 ± 1.81 and 26.8 ± 1.92 days, respectively.
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