PHENOLOGICAL DEVELOPMENT AND HEAT UNIT REQUIREMENT OF WHEAT UNDER DIFFERENT DATES OF SOWING

Article Id: ARCC1173 | Page : 161- 166
Citation :- PHENOLOGICAL DEVELOPMENT AND HEAT UNIT REQUIREMENT OF WHEAT UNDER DIFFERENT DATES OF SOWING.Indian Journal Of Animal Research.2011.(45):161- 166
Shalini Jhanji* and D.S. Gill shalini_jhanji@yahoo.com
Address : Department of Botany, Punjab Agricultural University, Ludhiana - 141 004, India.

Abstract

A field experiment was conducted to work out relationship between heat unit requirement and phenophases of two wheat cultivars (PBW-343 and WH-542 ) under different dates of sowing (2 November , 1 December  and 4 January). Growth duration and heat unit requirement of different phenophases was distinct for two cultivars, and showed a decline with delay in sowing. High temperature during reproductive development in late-sown crop forced the plants to attain maturity. For all phenological stages, plants of timely-sown crop accumulated more heat units in both cultivars than late-sown crop. The pheno-thermal indices decreased during vegetative stages but increased during reproductive phenophase with delay in sowing. The cultivar, PBW-343 took more number of days, accumulated more heat units and used heat more efficiently; and thus produced higher grain yield than WH-542. The timely-sown crop used heat more efficiently and yielded higher than late-sown crop. It was concluded that timely- sown crop exhibited best growth and grain yield as the favorable environmental conditions coincided with heat unit requirement of different phenophases of wheat.

Keywords

Grain yield Growing degree-days Heat-use efficiency Phenol-thermal index Sowing time Wheat.

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