who has the lowest k/9 in a single season with at least 250 ip since 1947

Since 1947, Clyde Wright has the worst K/9 with 250.0+ innings pitched in a season, with 2.28 per nine innings in 1973.

	NAME	K/9	IP	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Clyde Wright C. Wright	2.28	257.0	1973	CAL	37	11	19	.367	36	3.68	65	13	1	0	273	105	120	26	76	3	1	0	1,102	4	2.66	0.86	0.91	5.9	6.9	1.36	.265	4.20	103	4.29	120	9.56	-22.7
2	Ken Heintzelman K. Heintzelman	2.34	250.0	1949	PHN	33	17	10	.630	32	3.02	65	15	5	0	239	84	96	19	93	1	0		1,041	2	3.35	0.70	0.68	6.2	8.9	1.33	.255	3.46	77	4.11	105	8.60	-6.4
3	Lary Sorensen L. Sorensen	2.50	280.2	1978	MIL	37	18	12	.600	36	3.21	78	17	3	1	277	100	111	14	50	5	1	4	1,150	3	1.60	1.56	0.45	6.8	4.3	1.17	.262	3.56	86	3.25	87	8.88	14.6
4	Bob Purkey B. Purkey	2.52	250.0	1958	CIN	37	17	11	.607	34	3.60	70	17	3	0	259	100	106	25	49	4	2	3	1,040	1	1.76	1.43	0.90	6.7	4.7	1.23	.262	3.82	88	3.85	94	9.32	6.5
5	Randy Jones R. Jones	2.53	253.0	1978	SDP	37	13	14	.481	36	2.88	71	7	2	0	263	81	104	6	64	0	0	20	1,058	4	2.28	1.11	0.21	6.7	6.0	1.29	.280	3.70	87	3.08	90	9.36	9.6
6	Carl Morton C. Morton	2.53	277.2	1975	ATL	39	17	16	.515	39	3.50	78	11	2	0	302	108	122	19	82	3	0	3	1,199	1	2.66	0.95	0.62	6.5	6.8	1.38	.278	3.95	90	3.82	99	9.79	1.7
7	Jim Perry J. Perry	2.54	252.0	1974	CLE	36	17	12	.586	36	2.96	71	8	3	0	242	83	94	11	64	5	0	10	1,042	1	2.29	1.11	0.39	6.8	6.1	1.21	.259	3.36	81	3.39	92	8.64	8.6
8	Paul Splittorff P. Splittorff	2.61	262.0	1978	KCR	39	19	13	.594	38	3.40	76	13	2	0	244	99	113	22	60	3	0	2	1,069	3	2.06	1.27	0.76	7.1	5.6	1.16	.244	3.88	89	3.81	101	8.38	-1.5
9	Mike Caldwell M. Caldwell	2.62	258.0	1982	MIL	35	17	13	.567	34	3.91	75	12	3	0	269	112	119	30	58	0	0	3	1,064	9	2.02	1.29	1.05	7.0	5.5	1.27	.265	4.15	102	4.31	110	9.38	-11.8
10	Tommy John T. John	2.65	265.1	1980	NYY	36	22	9	.710	36	3.43	78	16	6	0	270	101	115	13	56	6	0	1	1,089	5	1.90	1.39	0.44	7.2	5.1	1.23	.275	3.90	88	3.49	88	9.16	14.6
11	Randy Jones R. Jones	2.65	315.1	1976	SDP	40	22	14	.611	40	2.74	93	25	5	0	274	96	109	15	50	4	0	9	1,251	0	1.43	1.86	0.43	7.4	4.0	1.03	.238	3.11	83	3.17	94	7.82	7.1
12	Jim Barr J. Barr	2.68	252.1	1976	SFG	37	15	12	.556	37	2.89	75	8	3	0	260	81	104	9	60	2	0	7	1,056	3	2.14	1.25	0.32	7.1	5.7	1.27	.276	3.71	81	3.23	95	9.27	4.9
13	Bill Lee B. Lee	2.70	260.0	1975	BOS	41	17	9	.654	34	3.95	78	17	4	0	274	114	123	20	69	3	0	1	1,093	2	2.39	1.13	0.69	7.1	6.3	1.32	.275	4.26	97	3.81	96	9.48	4.8
14	Lew Burdette L. Burdette	2.71	275.2	1960	MIL	45	19	13	.594	32	3.36	83	18	4	4	277	103	116	19	35	5	9	7	1,117	2	1.14	2.37	0.62	7.4	3.1	1.13	.265	3.79	96	3.26	96	9.04	3.1
15	Bob Porterfield B. Porterfield	2.72	255.0	1953	WSH	34	22	10	.688	32	3.35	77	24	9	0	243	95	99	19	73	1	2		1,036	2	2.58	1.05	0.67	7.4	7.0	1.24	.259	3.49	87	3.83	98	8.58	1.7
16	Lew Burdette L. Burdette	2.74	256.2	1957	MIL	37	17	9	.654	33	3.72	78	14	1	0	260	106	117	25	59	2	3	8	1,067	2	2.07	1.32	0.88	7.3	5.5	1.24	.260	4.10	104	3.83	109	9.12	-10.8
17	Dave Roberts D. Roberts	2.82	252.0	1976	DET	36	16	17	.485	36	4.00	79	18	4	0	254	112	122	16	63	4	0	4	1,048	3	2.25	1.25	0.57	7.5	6.0	1.26	.269	4.36	108	3.62	100	9.07	0.8
18	Ross Grimsley R. Grimsley	2.87	263.0	1978	MON	36	20	11	.645	36	3.05	84	19	3	0	237	89	103	17	67	2	0	6	1,068	4	2.29	1.25	0.58	7.9	6.3	1.16	.245	3.52	87	3.56	103	8.11	-3.3
19	Art Houtteman A. Houtteman	2.88	274.2	1950	DET	41	19	12	.613	34	3.54	88	21	4	4	257	108	112	29	99	8	6		1,147	2	3.24	0.89	0.95	7.7	8.6	1.30	.247	3.67	77	4.49	100	8.42	0.4
20	Ned Garver N. Garver	2.94	260.0	1950	SLA	37	13	18	.419	31	3.39	85	22	2	0	264	98	120	18	108	4	4		1,124	6	3.74	0.79	0.62	7.6	9.6	1.43	.271	4.15	71	4.12	88	9.14	15.8
21	Dave McNally D. McNally	2.94	266.0	1973	BAL	38	17	17	.500	38	3.21	87	17	4	0	247	95	100	16	81	5	0	6	1,083	5	2.74	1.07	0.54	8.0	7.5	1.23	.258	3.38	87	3.66	99	8.36	0.5
22	Scott McGregor S. McGregor	2.98	260.0	1983	BAL	36	18	7	.720	36	3.18	86	12	2	0	271	92	101	24	45	1	0	2	1,072	0	1.56	1.91	0.83	8.0	4.2	1.22	.270	3.50	80	3.81	95	9.38	5.2
23	Bill Lee B. Lee	3.03	282.1	1974	BOS	38	17	15	.531	37	3.51	95	16	1	0	320	110	123	25	67	4	0	0	1,190	3	2.14	1.42	0.80	8.0	5.6	1.37	.295	3.92	91	3.80	101	10.20	-0.4
24	Lew Burdette L. Burdette	3.04	272.1	1961	MIL	40	18	11	.621	36	4.00	92	14	3	0	295	121	131	31	33	3	4	3	1,126	1	1.09	2.79	1.02	8.2	2.9	1.20	.273	4.33	104	3.77	101	9.75	-1.9
25	Bob Lemon B. Lemon	3.08	286.2	1953	CLE	41	21	15	.583	36	3.36	98	23	5	1	283	107	119	16	110	11	4		1,216	9	3.45	0.89	0.50	8.1	9.0	1.37	.272	3.74	88	3.90	101	8.88	-2