|Head Rice Improvement-89
Project Leader and Principal UC Investigators
Shu Geng,professor, Department of Agronomy and Range Science, University of California, Davis
How to improve the quality and quantity of head
rice-and hence grower profitability-is the focus of research in this area.
Much of the work during 1989 centered around development of a comprehensive
computer system with practical field applications. Field experiments sought
to identify how well certain traits affecting head rice yield were passed on
generation to generation.
Computer program advances
Researchers report important advances in an automated computer system that analyzes rice kernel size and weight. The system combines the expert "CALEX" computer system (a similar one is used by cotton growers), information from the UC Integrated Pest Management rice manual, the head rice computer program and the California rice phenology model.
The program performs four basic functions:
A prototype of this system has been developed. Its physical components consist of a vibrating bowl kernel separator, a kernel processing module and an IBM XT computer with a 20 megabyte hard disk. Kernels are separated by weight, length, width and thickness. A computer image is then generated by these measurements. Tests determined the precision and accuracy of the system to be excellent.
In field experiments conducted at UC Davis, the researchers examined the heritability of a number of characteristics affecting head rice yield. They compared short, medium and long grain varieties under two different nitrogen fertilization regimes on different harvest dates.
While their analysis was not yet complete as this report was written, the researchers did notice the following noteworthy trends: