Effect of planting geometry on yield and yield attributes of drought tolerant rice varieties in Nawalparasi, Nepal
Mohan Mahato*1, Bishnu Bilas Adhikari1, Keshav Raj Adhikari1, Khem Raj Dahal1
A field experiment was conducted, to evaluate the yield and yield attributes of drought tolerant rice (Oryza sativa L.) varieties under different planting geometry in Narayani-7, Nawalparasi from May to November, 2014. The experiment was carried out in two factor Randomized Complete Block Design with three replications consisting three rice varieties (Sukhadhan-4, Sukhadhan-5 and Radha-4) and four planting geometry (15 cm × 10 cm, 15 cm × 15 cm, 20 cm × 15 cm and 20 cm × 20 cm). The results revealed that the highest grain yield (6.5 t ha-1) was obtained from plant spacing 20 cm ×15 cm with highest number of effective tillers m-2 (342.6) and highest harvest index (44.8%) while, number of filled grains panicle-1 and panicle length was found statistically at par with 20 cm × 20 cm and 20 cm × 15 cm planting geometry. However, the straw yield and test weight were non-significant with different planting geometry. Regarding tested varieties, Sukhadhan-5 produced highest grain yield (6.1 t ha-1) with highest number of effective tillers (337 m-2), more number of filled grain panicle-1 (144) and more harvest index (44%) compared to other tested varieties in the experiment. The Sukhadhan-4 recorded the longest panicle (28.5 cm) while Radha-4 produced significantly highest straw yield (8.1 t ha-1). Thus, Sukhadhan-5 with 20 cm × 15 cm spacing seems more economical and profitable to grow in rainfed lowland ecosystem in Terai and inner Terai areas of Nepal.
Keywords: Drought tolerant rice varieties, Grain yield, Planting Geometry