In the recent years phenolics have gained importance as PGR(s) [plant growth regulators]. To study their effect on pod development in peanut, four phenolic compounds (H-acid, 1,2,4-acid, resorcinol, and RD-Brown) were used in a field experiment with two foliar spray applications of 100 and 200 ug/mL at 35 and 50 days after planting. A randomized block design was used separately for two cultivars (C-501 and M-37 with three replications for each treatment. All treatments resulted in increased oil content and yield (kg/ha) of peanut (Arachis hypogaea L.). H -acid at 100 ug/mL was the most effective treatment for enhancing number of pods per plant, shelling percentage, yield (kg/ha) and oil percentage in C-501. While H-acid at 100 ug/mL gave the highest increase in number of pods/plant and oil percentage, resorcinol induced the highest yield per hectare and total oil content in M-37. The effect of phenolic compounds on these peanut parameters was independent of their structural configuration.

A decrease in net photosynthesis (Pn) in leaves of main shoot with age (7‐28 days after opening) at two stages of peanut (Arachis hypogaea L. var. M‐13) reproductive growth (70 and 90 DAS) is reported. Pn rate decreased with advance in age of leaves, the decline was rapid during peak period of pod filling (90 DAS). Foliar application with aliphatic alcohols, maintained the chlorophyll content and enhanced PEP carboxylase activity. The present studies suggest that aliphatic alcohols enhance functional capabilities of leaf for a larger duration and hence maintain the supply of photoassimilates to the developing kernels of peanut leading to increased yield.

Plants of peanut (Arachis hypogaea L . var . P G No . 1) were given two foliar sprays of phenolic compounds (H-acid, 1, 2, 4-acid, resorcinol and RD-Brown) at 100 and 200ppm, 35 and 50 days after sowing . In treated plants, shelling %, yield (kg/ha), number of gynophores per plant and number of pods per plant were significantly greater than in the control . Oil content of kernels also showed a significant increase with all the phenolic compounds applied . These compounds increased the linoleic acid concentration so improving nutritional quality . The number of gynophores was significantly correlated with the number of pods per plant and yield per hectare . The effect of phenolic compounds on growth and development was independent of their structural configuration .

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