Phenological behaviour of gobhi sarson (Brassica napus L.) and thermal indices as influenced by drip irrigation and fertigation schedules under semi-arid subtropical condition of Punjab

A field experiment was conducted during rabi 2016-17 and 2017-18, at the Research Farm of Department Agronomy, Punjab Agricultural University, Ludhiana, to study phenological behaviour gobhi sarson (Brassicanapus L.) thermal indices as influenced by drip irrigation (60, 80 100% cumulative pan-evaporation, CPE) fertigation schedules 100 % recommended dose fertilizers, RDF) in comparison with conventional flood manual application fertilizers i.e. absolute control. The pooled data revealed that Brassica irrigated through CPE took maximum number days attain 50% flowering, siliqua formation physiological maturity, followed 60% CPE. Higher levels also delayed taken various stages. Maximum seed yield observed RDF which statistically par 80% or RDF, but significantly higher than accumulation heat units along use efficiency (1.49 kg grains ha-1 °C day hour-1) obtained RDF.