Effect of different biostimulants on nutrient uptake and yield of rice

Abstract

A field experiment entitled “Effect of different biostimulants on nutrient uptake and yield of rice” was conducted during kharif 2022 at Agricultural and Horticultural Research Station, Kathalagere (Karnataka). The experiment was laid out in RCBD design consisting of ten treatments replicated thrice. The treatments consist of control (T1), soil application of humic acid at 5 kg ha-1 (T2), soil application of humic acid @ 10 kg ha-1 (T3), foliar application of humic acid @ 0.2 per cent (T4), soil application of seaweed extract @ 5 kg ha-1 (T5), soil application of seaweed extract @ 10 kg ha-1 (T6), foliar application of seaweed extract @ 0.2 per cent (T7), soil application of both humic acid @ 5 kg ha-1 and seaweed extract @ 5 kg ha-1 (T8), foliar application of both humic acid @ 0.2 per cent and seaweed extract @ 0.2 per cent (T9) and foliar application of jeevamrutha @ 3 per cent (T10). Among the different treatments tried, foliar application of humic acid @ 0.2 per cent, and seaweed extract at 0.2 per cent along with RDF at tillering and panicle initiation stage has recorded significantly higher grain yield (5678 kg ha-1) and straw yield (7483 kg ha-1) compared to other treatments. Also, recorded significantly higher total nutrient uptake of nitrogen (134.64 kg ha-1), phosphorous (39.30 kg ha-1) and potassium (93.66 kg ha-1) compared to other treatment combinations.