335-4 Using Controlled Release Fertilizers to Rice Growth, Yield and Nitrogen Use Efficiency.

Poster Number 1244

See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Fertilizer Performance
Wednesday, November 3, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Xiaohui Fan, University of Florida, Homestead, FL, Yuncong Li, Tropical Research and Education Center, University of Florida, Homestead, FL and Min Zhang, Shandong Agricultural University, Taian, China
Abstract China accounts for nearly 30% of global rice production which consume 7% of global nitrogen (N) fertilizer. Because the utilization rate of N in rice is about 30% ~35% in China, most of N from fertilizer entered into surface water or ground water. The objective of this study was to evaluate the possibility to improve N use of rice in China by applying controlled release nitrogen fertilizer (CRNF). Field experiments were conducted at Banqiao and Wangzhuan, Jiangsu, China. Plant growth, N uptake, rice grain yield and ammonia loss were investigated. At Banqiao site, applied CRNF had significantly higher plant N content than applied urea at the same N level. There was no significant difference in plant N content between CRNF and Urea at the same N level at Wangzhuan site. There were no significant difference in agronomy nitrogen use efficiency (NAE) and nitrogen recovery efficiency (NRE) between CRNF and Urea at equal N applied in the two sites. N harvest index (NHI) in CRNF was lower than urea from the two tests. Ammonia loss at CRNF was 7.3 kg/ha which was significantly lower than 21.2 kg N from urea at 200 kg N applied at Wangzhuan. At low N applied, CRNF had significant higher grain yield than urea at Banqiao. This study indicated effect of CRNF on rice growth varied with experimental sites. Beside CRNF having the advantage in labor-saving for fertilization and reducing nitrogen loss, key issues about how to efficiently apply CRNF in growing rice from formulation of CRNF, soil fertility and plant N need are further discussed.
See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Fertilizer Performance