PHOTO SYNTHETIC AND YIELD RESPONSEOF PEA (PISUM SATIVUM L.)TO FOLIAR APPLICATION OF SALICYLIC ACIDAND PHYTOHORMONES IN UTTARANCHAL HILLS

摘要

A field experiment was carried out for three consecutive years Rabi 19996-97;1997-98 and 1998-1999 to study the interactive effects of salicylic acid SA and phytohormones on photosynthesis and grain yield of pea variety VL Matar -1. The trial consisted of twelve treatments: water spray control Tx; 100 ppm SA T2; 50 ppm GA3 T3; 20 ppm Kn T4; 100 ppm NAA T5; 100 ppm ethrel T6; 10 ppm ABA T7; 100 ppm SA + 50 ppm GA3 Tg; 100 ppm SA + 20 ppm Kn T9; 100 ppm SA + 100 ppm NAA T10; 100 ppm SA + 100 ppm ethrel Tu; 100 ppm SA + 10 ppm ABA Tjj. All treatments of foliar spray accelerated the rates of photosynthesis; canopy photosynthesis; transpiration and carboxylation efficiency over the control. In addition to this; all treatments except foliar spray of GA3 alone; enhanced the grain yield which was 12% T8 & T9 to 30% TM higher than the control. Maximum rate of photosynthesis and grain yield were observed with 100 ppm SA +100 ppm NAA foliar spray at 40 days after sowing. Combined foliar spray of salicylic acid with GA; NAA and ethrel exhibited the positive interaction in terms of photosynthesis rate; pods per plant; pod weight per plant and negative interaction with Kn and no interaction with ABA. Besides this; significant association of grain yield with rates of photosynthesis; canopy photosynthesis and carboxylation efficiency suggested that SA and phytohormones enhanced the grain yield by the improvement of the photosyn-thetic efficiency of plant.