作者：李健捀、陳榮五、陳世雄、蔡宜峰

　　 本試驗自 2000 年一期作開始，至 2001 年二期作止。在臺中區農業改良場試驗田進行田間試驗。探討有機質肥料施用時期對於水稻生育之影響。試驗為避免因病蟲之危害，而影響肥料之實質表現，因此於水稻生育全程均以化學藥劑控制病蟲害之發生。結果顯示一期作每公頃施用 4 t 菜籽粕，無論全量做為基肥施用或分多次施用，其產量較化學肥料栽培者為高。二期作則每公頃施用 4 t 菜籽粕，分二次或三次施用，其產量亦較化學肥料栽培者為高。但每公頃施用 4 t 菜籽粕，如全量做為基肥施用，則其產量顯著低於化學肥料栽培。兩期作每公頃施用 12 t 雞糞堆肥 ( 基肥 ) 加 2 t 菜籽粕 ( 基肥 ) 及每公頃施用 12 t 雞糞堆肥 ( 基肥 ) 加 1 t 菜籽粕 ( 追肥 ) 之二種處理，其水稻產量與化學肥料栽培之產量相似。

關鍵字： 水稻、有機質肥料、施用時期 。

　　Field experiments were carried out during the first and second crops in 2000 and 2001 to investigate the effects of applied stage of organic fertilizers on the growth of three rice cultivars, i.e., Tainung 67 and Tai keng 9 of Japonica type, and Taichung sen 10 of Indica type. Six fertilizer treatments were conducted in this study. Under well control of blight, three kinds of treatments including (1) Rape seed meal 4 t/ha served as base fertilizers, (2) Rape seed meal 2 t/ha served as base fertilizers and 2 t/ha served as top-dressing, and (3) Rape seed meal 2 t/ha served as base fertilizers, 1 t/ha served as top-dressing, and 1 t/ha served at panicle initiation were practiced. On the first crop, rice yields of three kind of treatments were higher than that of chemical fertilizers. On the second crop, two kind of treatments including (1) Rape seed meal 2 t/ha served as base fertilizers and 2 t/ha served as top-dressing, (2) Rape seed meal 2 t/ha served as base fertilizers, 1 t/ha served as top-dressing, and 1 t/ha served at panicle initiation. Rice yields of two kind of organic fertilizers were higher than that of chemical fertilizers. On the first and second crop, two kind of treatments including (1) Chicken compost 12 t/ha and rape seed meal 2 t/ha served as base fertilizers, and (2) Chicken compost 12 t/ha served as base fertilizers, and rape seed meal 1 t/ha served as top-dressing were conducted. Rice yields of two kinds of organic fertilizers showed no significant difference yield as compared to that of chemical fertilizers.

Key words: rice (Oryza sativa L.), organic fertilizer, applied stage .