Agro meteorological indices influenced by different sowing dates, irrigation and fertilizer levels under late sown Indian mustard in western Haryana, India

A field experiments was carried out during 2018-19 and 2019-20 at Agronomy Research Farm, CCS HAU, Hisar. To compute the temperature based agrometeorological indices for Indian mustard sown under different growing environments along with Split plot design. Two sowing imposed through dates (2nd week of November 4th November) two irrigation levels (One flowering stage No post-sown irrigation) in main plots four fertilizer (87.5%, 100%, 112.5% 125% RDF) subplots replicated thrice. Crop 2nd had significantly higher (GDD, HTU, Tphoto, Tnycto TIDR) values over sowing. Among levels, one performed better respect to indices. application RDF exhibited followed by 112.5%, 100% 87.5% RDF. The seed yield biological were highly co-related accumulated GDD (0.95** 0.95**), HTU (**0.83 0.83**) Tphoto (**0.96 0.96**), (**0.953 0.951**) TIDR (0.970** 0.970**) clearly suggesting thereby significant effect these on crop. These can therefore very well used as indicators crop performance, once relationships are quantified tested.