Root System Response and Yield of Irrigated Rice in Relation to Irrigation, Potassium and Nitrogen under Subtropical Conditions

Irrigation and fertilizer are two essential factors affecting rice root traits and yield. In this respect, a pot experiment was performed at the boro (dry season irrigated) season of 2021-2022 in the Department of Agronomy of Bangladesh Agricultural University, Mymensingh, Bangladesh. The variety Binadhan-10 was planted at two irrigation conditions, i.e., saturation (S) and continuous flooding (CF); two potassium (K) doses, e.g., 65 kg ha(-1) (K-65) and 98 kg ha(-1) (K-98); and two nitrogen (N) doses, i.e., 140 kg ha(-1) (N-140) and 210 kg ha(-1) (N-210). The experiment was laid in a split plot design with eight treatments and replicated thrice. The findings confirmed the significant variation in irrigation, K and N and the effects on root number (RN), root length (RL), root volume (RV), leaf area index (LAI), total dry matter (TDM), yield attributes and yield. Considering the interaction among irrigation, K and N, the S conditions with K-65 and N-140 showed best performance in relation to root parameters. At 80 DAT, the highest RN (373.00), RL (1700.00 cm), RV (8.90 cm(3) hill(-1)), LAI (4.94) and TDM (25.83 g plant(-1)) was obtained from this combination. Grain yield (GY) and root traits, except root porosity, showed a significant positive association. Grain yield (GY) was the highest (27.12 g pot(-1)) under S conditions with K-65 and N-140. Therefore, the variety Binadhan-10 can be successfully cultivated with K-65 and N-140 under S conditions.

Automated summary

Irrigation and fertilizer have significant effects on rice root traits and yield. A pot experiment was conducted in the boro season of 2021-2022 to investigate the effects of different irrigation, potassium, and nitrogen conditions on root parameters and yield of the rice variety Binadhan-10. The results showed that the saturation condition with K-65 and N-140 had the best performance in terms of root parameters, and grain yield was highest under this combination. Therefore, Binadhan-10 can be successfully cultivated with K-65 and N-140 under saturation conditions.