Effect of weeding times and organo-mineral fertilizer rates on the growth and yield of Bac Huong 9 rice variety

Abstract

The study aimed to study the effects of organo-mineral fertilizer rates and weeding times on the growth and yield of Bac Huong 9 rice variety. The experiment was arranged in a split-plot design with three replications. The main-plot factor was the manual weeding times: No weeding (T1), weeding once at the active tillering stage (T2) and weeding twice at the active tillering and flowering stages (T3). The sub-plot factor was organo-mineral fertilizer application with 4 levels: 0 tons/ha (P1), 1.5 tons/ha (P2), 2.0 tons/ha (P3), 2.5 tons/ha (P4). The results showed that increasing organo-mineral fertilizer application combined with weeding regimes significantly increased growth indicators, physiological indicators, yield components and grain yield of rice plants. Grain yield was highest in plots fertilized at P3 and P4 combined with manual weeding at T2 and T3, ranging from 7.10 to 7.34 tons/ha.