Field experiments were carried out on Taichung DARES from 1995 through 2000 to investigate the effects of long term application of rape seed meal on the grain-quality of five rice cultivars, i.e., Tainung 67, Taichung 189, Tai keng 6 and Tai keng 9 of Japonica type, and Taichung sen 10 of Indica type. Conventional, semi-organic and organic farming were conducted in this study. Experimental results revealed that organic and semi-organic farming had better milling quality than that of conventional farming on the first crop. On the second crop, organic farming had more serious bacterial leaf blight and sheath blight than conventional farming, that was the main effect factor resulted in organic farming had lower grain filling and milling quality than that of conventional farming, semi-organic farming showed no significant difference milling quality as compared to that of conventional farming. Temperature was the main effect factor of amylose content of milled rice during grain filling. Stepwise regression analysis revealed that crude protein content in grain is the main factor affecting the eating quality of cooked rice. The results also revealed that rape seed meal 2 ton/ha served as base fertilizers, 1 ton/ha served as top-dressing, and 1 ton/ha served at panicle initiation were successively practiced. Organic farming had higher crude protein content of milled rice than that of conventional farming and thus induce negative effect to eating quality. Tai keng 9 had higher milling quality and lowest crude protein content of milled rice than that of other cultivars thus had better eating quality.

Key words: rice (Oryza sativa L.), rape seed meal, rice quality .