105759 A Significant Effect of the Interactions between Fertilisation Regime and Crnf Types on Rice Yield and N Use Efficiency.
Poster Number 1213
See more from this Division: ASA Section: Agronomic Production Systems
See more from this Session: Agronomic Production Systems General Poster
Wednesday, October 25, 2017
Tampa Convention Center, East Exhibit Hall
Abstract:
Rice side-dressing machine fertilizer technique is exclusive banding fertilizer of rice, with lower labour/time costs. However, the effect of its application with different controlled release nitrogen fertilizers (CRNF) on rice production is unclear. The field experiment was performed in 2015-2016 to investigate the effects of three types of CRNF (bulk blending fertilizer (BBF), polymer-coated urea (PCU) and sulphur-coated urea (SCU)) and two fertilisation regimes (broadcast (B), side-dressing (S)) on paddy soil NH4+- N temporal and spatial distribution, rice yield and NUE. Conventional high-yield fertilisation (CK) and 0-N treatments were established as controls. Meanwhile, the N release of CRNF was measured by burial method.
The results suggest that fertilization regimes (R), fertiliser types (T) and their interaction significantly affected rice yield and NUE. For the broadcast regime, B-BBF incurred the highest rice yield and NUE among CRNF in both years, as a result of more balanced supply of N at tillering stage and from panicle initiation to heading stage. Compared with corresponding CRNF with broadcast regime, side-dressing regime significantly increased rice yield of S-SCU by 24.3%-19.0%, and NUE by 24.4%-26.3% in 2015-2016, respectively. However, no yield advantage of S-PCU accompanying 24.4%-26.3% significant enhancement in NUE. Moreover, S-BBF showed no significant benefits on rice yield and NUE compared with B-BBF, however, these factors were slightly greater than those of CK in each year.In addition, side-dressing regime increased the duration time of NH4+-N peak value of localized rhizosphere soil compared with correspondently CRNF with broadcast regime. In summary, side-dressing is an effective way for promote rice yield and NUE compared to broadcast regime, but the benefits varied in distinct patterns for the different CRNF. SCU and BBF were more suitable for side-dressing regime, lead to equivalent rice yield and NUE relative to CK with lower labour/time costs.
The results suggest that fertilization regimes (R), fertiliser types (T) and their interaction significantly affected rice yield and NUE. For the broadcast regime, B-BBF incurred the highest rice yield and NUE among CRNF in both years, as a result of more balanced supply of N at tillering stage and from panicle initiation to heading stage. Compared with corresponding CRNF with broadcast regime, side-dressing regime significantly increased rice yield of S-SCU by 24.3%-19.0%, and NUE by 24.4%-26.3% in 2015-2016, respectively. However, no yield advantage of S-PCU accompanying 24.4%-26.3% significant enhancement in NUE. Moreover, S-BBF showed no significant benefits on rice yield and NUE compared with B-BBF, however, these factors were slightly greater than those of CK in each year.In addition, side-dressing regime increased the duration time of NH4+-N peak value of localized rhizosphere soil compared with correspondently CRNF with broadcast regime. In summary, side-dressing is an effective way for promote rice yield and NUE compared to broadcast regime, but the benefits varied in distinct patterns for the different CRNF. SCU and BBF were more suitable for side-dressing regime, lead to equivalent rice yield and NUE relative to CK with lower labour/time costs.
See more from this Division: ASA Section: Agronomic Production Systems
See more from this Session: Agronomic Production Systems General Poster