Studies to moderate the heat stress effects on wheat (Triticum aestivum L.) productivity
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Date
2010
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Punjab Agricultural University, Ludhiana
Abstract
The field experiment entitled “Studies to moderate the heat stress effects on wheat (Triticum aestivum L.) productivity” was carried out at Punjab Agricultural University, Ludhiana during 2009-10. Results of the investigation indicated that wheat yields in heat stress environment can be raised significantly by modifying agronomic practices. The sowing of 25 November gave significantly higher grain yield than late sowing of 10 December. The crop sown on 25 November with zero tillage in standing stubbles after removal of loose straw and one foliar spray of KNO3 (1%) during anthesis was at par in grain yield than those obtained with conventional tillage without mulching + two foliar spray of KNO3 (1%) during anthesis/one additional irrigation during post anthesis, conventional tillage with mulching + one additional irrigation during post anthesis/ recommended irrigation. It was significantly higher than the crop sown on 25 November and 10 December with other methods of planting and agronomic practices. When crop sown very late on 10 December gave the maximum yield with zero tillage in standing stubbles after removal of loose straw with one/two foliar spray of KNO3 (1%) during anthesis or one additional irrigation during post anthesis conventional tillage without mulching with two foliar spray of KNO3 (1%) during anthesis/one additional irrigation during post anthesis and conventional tillage with mulching with one additional irrigation during post anthesis which was significantly higher than crop sown 10 December with other methods of planting as well as agronomic practices. In heat stress environment the higher yield obtained from the crop sown on 25 November and 10 December with the modifying practices due to the higher growth, yield contributing characters, lower soil and canopy temperature and especially higher use of growing degree days and photo-thermal units by the crop sown on 25 November.
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