Effect of Nitrogen Application Methods on Yield and Grain Quality of an Extremely Early Maturing Rice Variety

Abstract

This study aimed to investigate the effect of nitrogen application methods on the yield and grain quality of an extremely early maturing rice variety. The experiment was conducted in the rice research field of Chungnam Agricultural Research and Extension Services, South Korea, in 2019 and 2020. Two nitrogen application methods, BD (100% as a basal dressing) and BTD (70% as a basal dressing + 30% as a top dressing), with three different nitrogen levels (70 kg/ha, 90 kg/ha, and 110 kg/ha), were employed. The results showed that BD treatment had comparable or higher head rice yields and improved grain quality compared to BTD treatment at all nitrogen levels. Additionally, the SPAD value at heading date was highly correlated with both the protein content (r2 = 0.838**) and glossiness of cooked rice (r2 = 0.630**). Therefore, this study suggests that BD treatment could be an effective approach to improve the productivity and quality of extremely early maturing rice varieties while saving on labor costs, and the SPAD value can be used as an index to infer the taste of rice. In conclusion, this study provides useful insights into nitrogen application methods that can be used to enhance the yield and quality of extremely early maturing rice varieties.

Effect of Transplanting Date on Agronomic and Grain Quality Traits Using Early-Maturing Rice Varieties

“…In general, protein content was negatively correlated with eating quality because rice with a higher protein content had lower adhesiveness, glossiness, taste, and stickiness when cooked than rice with a lower protein content [43][44][45][46]. The results of the study indicate that the protein content of rice can be significantly influenced by the transplanting date, even when the same level of fertilizer is applied.…”