To Establish the Yield Response Factor (Ky) of Different Soybean Varieties in Northern Area of Pakistan

Abstract

A field study was conducted on clay loam soil at the Agriculture research institute, Swat during Kharif 2012. Main objective of the study was to determine the yield response factor on maximum,optimal and minimum irrigation levels of soybean varieties, using two varieties (swat 84 and malakand 96) having four replicates and four irrigation levels. Relative yield response (Ky) were determined from relative yield decrease (1-Ya/Ym) and relative evapotranspiration deficit (1-ETa /ETm). Ky values on I₁(I₄₀) of variety V₁ (Swat 84) were recorded from 0.38 to 1.48 and Ky values on I₁of V₂(Malakand 96) were recorded from 0.82 to 2.78. Ky values on I₂(I₆₀)of variety V₁ were recorded from 0.37 to 1.77, and Ky value on I₂ of V₂ were recorded from 0.79 to 3.23. Ky values on I₃(I₈₀) of variety V₁ were recorded from 0.30 to 1.52, and Ky values on I₃ of V₂ were recorded from 0.47 to 3.14. Ky values of variety V₁ ranged from 0.30 to 1.77, for V₂ it ranged from 0.47 to 3.23.Hence it is concluded that among both the varieties V₂ performed better on irrigation two (V₂I₂), thereforethis strategy is recommended for irrigated areas of Khyber Pakhtunkhwa, Pakistan