Management of weather variability and terminal heat stress in wheat by altering sowing time
2017
Singh, Sukhvir | Kingra, P.K. | Dhaliwal, L.K.
Wheat can be grown in a wide range of climatic conditions but many biotic and abiotic factors limitits yield. The present investigation was carried out to manage weather variability and terminal heatstress in wheat by altering sowing time. A field experiment was conducted at the Research Farm,School of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhianaduring rabi 2013-14 with wheat variety PBW 621 sown on three i.e. D1 (29th October), D2 (12thNovember) and D3 (28th November). In the earlier sown crop, the maximum and minimumtemperature was higher during initial and lower during later crop growth stages and the reversepattern was observed with delay in sowing. As relative humidity is inversely proportional totemperature, thus relative humidity increased during initial crop growth stages and decreased atlater stages of crop growth with delay in sowing. The crop received a total of 157.2, 143.6 and 171.6mm rainfall under D1, D2 and D3, respectively. Periodic number of tillers, plant height and drymatter were significantly higher under earlier sown crop and decreased with delay in sowing.Yield attributing characters i.e. number of effective tillers, ear length, number of spikelets per ear,grain weight per ear and 1000 grain weight were higher under D1 followed by D2 and D3. Thehighest grain yield was produced in D1 (46.2 q ha–1) which was statistically at par with D2 (45.3 qha–1) and was significantly higher than D3 (38.9 q ha–1). The study highlights the role of earliersowing of wheat in managing the weather variability impact and thermal heat stress under Punjabconditions.
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Эту запись предоставил Indian Council of Agricultural Research