Precision nitrogen management through Leaf Colour Chart for improved yield attributes and yield of transplanted rice
B Bhavana, P Laxminarayana, A Madhavi Latha, T Anjaiah
A field experiment was carried out during kharif, 2018 on sandy loam soil at college farm, College of Agriculture, Rajendranagar, PJTSAU, Hyderabad, with an objective to optimize nitrogen level and to determine LCC critical value for short duration transplanted rice. There were 9 treatments with 3 replications laid out in RBD which included two doses of nitrogen (120 and 150 kg ha-1) applied on basis of two critical LCC values- 3 and 4. In turn N was applied in 3 equal splits incase of 120 kg N ha-1 and with 150 kg N ha-1 it was applied in 3 and 4 splits with half as basal. These LCC based treatments were evaluated against control with no nitrogen, recommended method and farmers practice with (120-60-40), (180-80-40) RDF respectively applied at fixed time intervals. Results revealed that, N application based on LCC value-4 was more beneficial than LCC-3 in improving yield attributes and yield of rice. N application at 150 kg ha-1 at LCC-4 (T9) produced significantly (p=0.05) highest panicles m-2 (279), length of panicle (22.9 cm), spikelets panicle-1(108), filled grains panicle-1 (98), test weight (24.71 g) and grain yield (6,533 kg ha-1). Thus LCC-4 based N applicaton is considered as suitable nitrogen management technique in transplanted rice.