PJB-2024-419
MITIGATING HEAT STRESS EFFECT ON CROP GROWTH, PHYSIOLOGICAL TRAITS, PHENOLOGY AND GRAIN YIELD OF WHEAT BY INTEGRATING SOWING DATES, SOIL AND FOLIAR APPLICATION OF POTASSIUM IN PUNJAB
Jaskirandeep Kaur
Abstract
Field experiment was conducted to study integrated effect of two sowing dates (early sowing (ES) on 30 October and late sowing (LS) on 30 November) and two soil K application rates (no soil K (K0) and 25 kg Kha-1 (K25) in main plots and five potassium spray treatments (control, foliar application of 2% KCl at booting (KCl-B) and anthesis (KCl-A), 2% KCl at booting + anthesis (KCl A+B) and 2% KNO3 at booting and anthesis stage (KNO3 A+B) in subplots on heat stress mitigation in wheat . Results revealed that during both years periodic crop biomass, leaf area index, relative leaf water, chlorophyll content, net photosynthetic rate, transpiration rate, stomatal conductance, days to maturity, yield attributes and grain yield of wheat was significantly higher in ESK25 compared to ESK0, LSK0 and LSK25. These parameters were at par in ESK0 and LSK25 but significantly higher than LSK0. Foliar spray of potassium through 2% KCl (KClB+A) or KNO3 (KNO3 B+A) significantly increased all these parameters compared to control (no spray), KClB and KClA. However, the proline content (stress indicator) was significantly higher in LSK0 compared to ESK0, ESK25 and LSK25. Control (no spray) has significantly higher proline content than all other spray treatmens. Interaction of main and sub treatments were also significant for grain yield. Grain yield in LSK25 was at par with ESK0 with KClB or KClA but significantly lower than ESK0 alongwith KClB+A or KNO3B+A. Grain yield in ESK0 was at par with LSK0 with KClB+A or KNO3B+A but significantly higher than KClA or KClB. In LSK25 grain yield was at par with LSK0 having KClA or KClB, KClB+A or KNO3 B+A. Grain yield in ESK25 was at par with ESK0 having one spray of KClA but significantly lower than KClB+A or KNO3 B+A.
To Cite this article:
Download
