Stimulatory effect of different agrochemicals on growth, photosynthetic pigments and yield of rice (Oryza sativa L.)

Abstract

A field experiment was conducted during kharif season 2017 at Agriculture Research Station Gangavati, UAS, Raichur, Karnataka, to study the stimulatory effect of different agrochemicals on growth parameters, photosynthetic pigments and yield of rice (var. GNV10-89). The experiment was laid out in a randomized complete block design with three replications and 10 treatment along with control as follows: T1: 25 % extra nitrogen (N) soil application, T2: NPK (19:19:19) @ 1.0 %, T3: triacontanol (2.0 ml l-1), T4: GA3 (50 ppm), T5: nitrobenzene (20 ppm), T6: salicylic acid (500 ppm), T7: 6-BAP (20 ppm), T8: borax (0.2 %), T9: T3 + T8 foliar applications and T10: control. The results with respect to growth parameters and photosynthetic pigments were differed significantly by foliar as well as soil application of different agrochemicals at 65 and 85 days after transplanting (10 days before and 10 days after panicle initiation). Foliar spray of NPK (19:19:19) @ 1.0 % recorded the significantly higher chl. a (2.47 mg g-1 fr.wt.), chl. b (0.82 mg g-1 fr.wt.) and chl. a + b (3.29 mg g-1 fr.wt.) than rest of the treatment. The treatment NPK (19:19:19) @ 1.0 % recorded maximum number of green leaves per hill (69.8), higher panicle length (25.4 cm), leaf area duration (44.6 days), filled spikelets per panicle (232.9) and the highest grain yield (8709.8 kg ha-1) as compared to rest of the treatment.