| Autor: |
Smartt, A. D., Frizzell, D. L., Norman, R. J., Hardke, J. T., Roberts, T. L., Slaton, N. A., Coffin, M. D., Gruener, C. E., Castaneda-Gonzalez, E., Plummer, W. J., Clayton, T. L. |
| Předmět: |
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| Zdroj: |
B.R. Wells Rice Research Studies - Arkansas Agricultural Experiment Station, University of Arkansas System; Aug2019, Issue 659, p375-385, 11p |
| Abstrakt: |
Hybrid rice cultivars have accounted for approximately 40% of harvested rice acres in Arkansas in recent years. The current University of Arkansas System Division of Agriculture's Cooperative Extension Service recommendation for hybrid cultivars, in addition to preflood nitrogen (N) fertilizer, is for 30 lb N/ac, termed late-boot N fertilizer, to be applied between late boot and beginning heading in order to reduce lodging and enhance grain and milling yields. To determine the validity of this recommendation on current hybrid cultivars, a study was initiated to examine the effects of the lateboot N application on the grain yield, milling yield, and lodging of two new hybrids. The RiceTec (RT) hybrids most commonly grown in Arkansas, RT CLXL745 and RT XP753, were seeded at three University of Arkansas System Division of Agriculture experiment centers/stations. Results of this study suggest that the late-boot N application has a positive impact, relative to rice receiving no boot N, on milling yields of RT CLXL745 and RT XP753, often significantly increasing percent head rice. Percent total white rice was less impacted by the late-boot N application. Substantial lodging of RT CLXL745 occurred at two locations, while lodging of RT XP753 was minor and only at one location. Lodging was reduced numerically by the late-boot N application in all cases, but only significantly for RT CLXL745 at one location. Relative to no boot N, the late-boot N application significantly increased the grain yields of both cultivars at two locations by 9 to 17 bu./ac, while smaller, non-significant increases occurred at the other location. The potential benefits of a 30 lb N/ac late-boot N application to hybrids are apparent, but it will be important to collect more data to further understand and clarify the statistical relationship of the late-boot N application on lodging, milling yields, and grain yields of current hybrid rice cultivars. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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