Author(s):

P Keerthi, RK Pannu, AK Dhaka, Kautilya Chaudhary and SK Sharma

Abstract: Field experiments were conducted at the experimental farm of Chaudhary Charan Singh Agricultural University, Hisar, Haryana (latitude 29⁰ 10’ N and longitude 75⁰ 36’ E Latitude) during rabi season of two years (2013-14 and 2014-15). The experiment was laid out in split plot design with three replications consisted four dates of sowing as main plots and five nitrogen levels as sub plot treatments. The Indian mustard variety RH 0749 was selected. The growth parameters were measured at 30, 60, 90, 120 DAS and at maturity stage. The growth parameters LAI, total dry matter/plant, and CGR progressively got decreased with delay in sowing. Among the nitrogen levels, 100 kg N/ha recorded highest growth parameters significantly. Absorbed PAR in mustard found decreased with delay in sowing. Mustard fertilized with 100 kg N/ha absorbs maximum PAR. Delay in sowing adversely affected the radiation use efficiency of mustard crop. The radiation use efficiency varied between1.74 to 2.18 (2013-14) and 1.67 to2.04 g/MJ (2014-15). Radiation use efficiency explained around 77 and 94 per cent variability in leaf area index and total dry matter of mustard crop.

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