Abstract:
Groundnut is a key field crop in the tank cascade systems of in the dry zone
of Sri Lanka. It is a main source of protein and a source of income for smallholder
farmers. Groundnut has little diversity and self-pollinates. Therefore, standard breed-
ing techniques can only improve groundnut cultivars to a certain point. Therefore, this
study was conducted to examine the effect of gamma irradiation on the yield charac-
teristics of groundnut. The field experiment was conducted from July 2022 to October
2022 at the Crop Farm, Eastern University of Sri Lanka. Groundnut seeds were ex-
posed to Gamma irradiation using a "Gamma chamber 1200 Cobalt- 60" research ir-
radiator. Treatments such as 0Gy (T1), 100Gy (T2), 200Gy (T3), 300Gy (T4), 400Gy
(T5), and 500Gy (T6) were used in this experiment. Seedlings from treated seeds were
transplanted in an open field after being planted in poly bags with rooting media.
Treatments were laid out in a randomized complete block design with five replica-
tions. Yield parameters such as number of pods, fresh weight of pods, 100 seed
weight, and total yield were recorded. The recorded data were analyzed using
ANOVA and the Duncan multiple range test was used to compare the treatment means
at a 5% significant level. The study revealed that there was a significant difference
(P<0.05) among the different levels of gamma irradiation and treatment T3 (200 Gy)
showing significantly increased number of pods (47%), fresh weight of pods (28.8%),
dry weight of pods (41.4%), 100 seed weight (47.7%) and total yield (65.6%) com-
pared to control. Therefore, based on the above results, the treatment T3 (200 Gy) is
the best to improve the yield of groundnut (var. Indi).
