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A field experiment was conducted during rabi 2016-17 at Research farm of Punjab Agricultural University, Ludhiana involving two barley (Hordeum vulgare L.) varieties: V1 (DWRUB 52, Two-rowed) and V2 (PL 807, Six-rowed) sown on three sowing dates viz. D1 (25th October), D2 (10th November), D3 (25th November) and three irrigation levels viz. I1 (Recommended 4 post sowing irrigation), I2 (Skip at vegetative stage), I3 (Skip at anthesis stage) replicated thrice in factorial split plot design to investigate heat summation indices in relation to crop phenology under changed microclimate. | Study on specified growth attributes thermal unit requirement and its utilization efficiency in barley cultivars under varied microenvironment
