Effect of planting geometry and timing and source of nitrogen application on yield and yield attributing character of rice (Oryza sativa L.) under system of rice intensification

Abstract

An experiment was conducted at Agronomy Research Station, Orissa University of Agriculture and Technology, Bhubaneswar during Kharif season of 2012 to study the effect of different fertility levels, planting patterns per hill and their interaction on productivity of rice variety ‘Lalat’ under SRI. F 2 (FYM @ 15 t ha + vermicompost 2 t ha + neem cake 250 kg ha) gave highest yield (8.76 t ha). It was found that twice or thrice splitting of N was at par (7.62 and 7.57 t ha). Highest harvest index was recorded from F 2 (51.11 %) among main plots and P 1 (25×25cm spacing with 1 seedling hill) i.e. 50.41 per cent among subplots. F 4 (FYM @ 5 t ha + N : P 2 O 5 : K 2 O @ 30:30:30 kg ha basal) and P 3 (30×30 cm spacing with 1 seedling hill) gave the lowest harvest index (45.74 % and 43.33 %, respectively). Three plants per hill with wider spacing of 30×30 cm gave the highest yield among all planting patterns. Wider spacing was found more beneficial. More than one plant per hill had given increased yield due to higher plant population per m in comparison to one plant per hill. Fertility level (F 4 ) with half of RDF of nitrogen, recorded the lowest yield (5.87 t ha). Among the subplots the lowest yield was recorded in P 3 i.e. one seedling per hill at 30×30 cm spacing (6.75 t ha).