Abstract—TheseA field experiment was conducted duringkharif 2012 at ARS, Gangavathi, UAS, Raichur to standardize the suitable age of seedlings, stage and concentration of GA3 spray for mechanical transplanting of rice seedlings. The treatment consisted of different age of seedlings (20, 25 and 30 days old seedlings) and two concentrations of GA3 (25 and 50 ppm) and sprayed on 10 days and 15 days old seedlings. The results revealed that 30 days old seedlings along with spraying of GA3 @ 50 ppm on 15 days old seedlings recorded significantly higher seedling growth parameters like shoot length (26.62 cm), root length (12.29 cm), root volume (9.33 cm3) and lowest was recorded with 20 days old seedlings without GA3 spray (14.2 cm, 6.26 cm and 4.00 cm3) respectively. Whereas, 20 days old seedlings with spraying of GA3 @ 50 ppm on 15 days old seedlings recorded higher number of tillers per hill (22.9), seed yield (47.05 q/ha), straw yield (23.7 q/ha), lowest unfilled seeds (6.1) and highest B:C ratio (2.7). Among the various age of seedlings and concentration of GA3 used for the study, twenty days old seedlings along with spraying of GA3 @ 50 ppm on 15 days old seedlings were found most suitable for walk behind mechanical transplanter in order to get better seedling establishment, plant growth, seed yield and to realise more profit by minimising the cost of seed production.

Index Terms—paddy transplanter, seedling, characteristics, seedling growth, GA3

Cite: S. N. Vasudevan, Basangouda, Rakesh C. Mathad, S. R. Doddagoudar, and N. M. Shakuntala, "Standardization of Seedling Characteristics for Paddy Transplanter," Journal of Advanced Agricultural Technologies, Vol. 1, No. 2, pp. 141-146, December 2014. Doi: 10.12720/joaat.1.2.141-146