3) Sweetpotato production in Japan

(1) Planted area

(Unit: ha)

Year	1980	1985	1993	1994	1995	1996	1997	1998	1999
Japan	64,800	66,000	53,000	51,300	49,400	47,500	46,500	45,600	44,500
Ibaraki Prefecture	6,730	9,090	7,920	7,820	7,880	7,650	7,640	7,600	7,550
Chiba	6,740	7,440	7,220	6,940	6,480	6,410	6,290	6,150	6,100
Shizuoka	2,200	2,250	1,820	1,720	1,570	1,480	1,460	1,370	1,330
Tokushima	1,300	1,240	1,300	1,310	1,330	1,310	1,310	1,300	1,290
Nagasaki	2,710	2,060	1,420	1,240	1,180	1,140	1,030	914	868
Kumamoto	2,520	1,800	1,520	1,450	1,390	1,400	1,400	1,410	1,400
Miyazaki	4,920	4,890	3,170	3,000	2,900	2,730	2,640	2,550	2,370
Kagoshima	21,400	22,300	16,400	16,200	15,500	14,600	14,200	14,000	13,500

(2) Yield per 10a

(Unit: kg)

Year	1980	1985	1993	1994	1995	1996	1997	1998	1999
Japan	2,030	2,310	1,950	2,460	2,390	2,330	2,430	2,500	2,270
Ibaraki Prefecture	2,190	2,320	2,070	2,410	2,460	2,630	2,590	2,180	2,530
Chiba	2,200	2,330	2,260	2,690	2,410	2,430	2,450	2,280	2,560
Shizuoka	1,950	2,150	2,020	2,160	2,020	2,210	2,050	2,110	2,060
Tokushima	1,750	2,160	1,850	2,290	2,130	2,110	2,120	2,210	2,280
Nagasaki	1,850	1,950	1,660	1,730	2,200	2,090	2,050	2,070	1,650
Kumamoto	1,820	2,350	1,840	2,520	2,510	2,400	2,420	2,450	2,010
Miyazaki	2,230	2,540	2,050	2,790	2,660	2,370	2,560	2,780	2,120
Kagoshima	2,330	2,730	2,100	2,970	2,860	2,610	2,950	3,290	2,510

(3) Production

(Unit: 1000t)

Year	1980	1985	1993	1994	1995	1996	1997	1998	1999
Japan	1,317	1,527	1,033	1,264	1,181	1,109	1,130	1,139	1,008
Ibaraki Prefecture	147	211	164	189	192	201	198	166	191
Chiba	148	173	163	187	156	156	154	140	156
Shizuoka	43	48	37	37	32	33	30	29	27
Tokushima	23	27	24	30	28	28	28	29	29
Nagasaki	50	40	24	22	26	24	21	19	14
Kumamoto	46	42	28	37	35	34	34	35	28
Miyazaki	110	124	65	84	77	65	68	71	50
Kagoshima	499	609	344	481	443	381	419	461	339

Source:

Crop Statistics