Table 20. Early Nov. Planted, Knoxville, TN, Biomass and Weed Suppression

Table 20. By location mean biomass and weed suppression of 36 cover crop varieties and 8 mixes planted in early Nov. 2020, in small plot replicated trials, at the East Tennessee AgResearch and Education Center, in Knoxville, Tennessee, and evaluated from Fall 2020 to Spring 2021.

Variety	Common Name	Group	Biomass (DM ton/ac)				Biomass (DM lb/ac)				Weed Proportion (%)

Variety	Common Name	Group	Biomass (DM ton/ac)				Biomass (DM lb/ac)				Weed Proportion (%)
			Apr		May		Apr		May		Dec‡		Feb‡		Apr‡		May
Cereals
Bates RS4	Cereal Rye	Cereal	1.2	A	2.3	A-C	2497	A	4589	A-C	40	KL	9	EF	3	D-F	2	DE
Elbon	Cereal Rye	Cereal	0.7	DE	2.5	A	1437	DE	4955	A	40	KL	9	EF	0	F	2	DE
NF95319B	Cereal Rye	Cereal	1.1	AB	2.2	A-D	2300	AB	4500	A-D	34	L	8	EF	0	F	2	DE
NF97325	Cereal Rye	Cereal	0.9	CD	1.8	B-G	1751	CD	3685	B-G	51	H-K	13	D-F	3	D-F	5	CD
NF99362	Cereal Rye	Cereal	1.0	BC	2.3	A-D	1986	BC	4547	A-D	41	J-L	7	F	0	F	3	D
Yankee	Cereal Rye	Cereal	0.3	H-L	1.6	E-H	549	H-L	3104	E-H	43	J-L	19	D-F	7	C-F	2	DE
TN1902	Wheat	Cereal	0.5	EF	2.1	A-E	1071	EF	4197	A-E	48	I-L	13	D-F	0	F	2	DE
Legumes
Paradana	Clover, Balansa	Legume	0.1	K-M	0.5	J	240	K-M	1098	J	99	AB	98	A	18	A	35	AB
Taipan	Clover, Balansa	Legume	0.1	K-M	0.5	J	251	K-M	977	J	99	A	100	A	17	AB	43	A
Viper	Clover, Balansa	Legume	0.1	K-M	0.7	J	167	K-M	1369	J	99	AB	100	A	15	A-C	25	AB
Lightning	Clover, Berseem	Legume	0.1	LM	0.4	J	141	LM	826	J	99	AB	98	A	12	A-D	27	AB
Dixie	Clover, Crimson	Legume	0.0	M	0.8	IJ	94	M	1662	IJ	55	G-J	82	AB	13	A-C	12	BC
AU Merit	Vetch, Hairy	Legume	0.4	F-H	1.4	GH	836	F-H	2796	GH	73	C-E	63	BC	2	EF	2	DE
Patagonia	Vetch, Hairy	Legume	0.5	E-G	1.3	HI	1019	E-G	2524	HI	78	CD	65	BC	0	F	0	E
WinterKing	Vetch, Hairy	Legume	0.3	G-K	1.6	E-H	601	G-K	3151	E-H	97	AB	95	A	3	D-F	0	E
Brassicas
Vivant	Hybrid (turnip x rapeseed)	Brassica	0.2	I-M	0.5	J	392	I-M	1077	J	55	G-J	18	D-F	8	B-F	20	AB
Aerifi	Radish	Brassica	0.3	G-K	0.6	J	601	G-K	1155	J	47	I-L	11	D-F	10	A-E	12	BC
Jackpot	Turnip	Brassica	0.1	J-M	0.5	J	277	J-M	1071	J	53	H-K	31	DE	17	AB	12	BC
Mixes
Bates RS4 (20%) + Dixie (80%)	Cereal Rye + Crimson Clover	Mix	0.9	CD	1.7	D-H	1730	CD	3420	D-H	64	D-H	13	D-F	3	D-F	3	D
Bates RS4 (20%) + AU Merit (80%)	Cereal Rye + Hairy Vetch	Mix	1.0	BC	1.8	B-H	1996	BC	3581	B-H	68	D-G	8	EF	0	F	0	E
Bates RS4 (10%) + Dixie (90%)	Cereal Rye + Crimson Clover	Mix	0.8	CD	2.3	AB	1568	CD	4698	AB	58	F-I	33	D	3	D-F	7	CD
Bates RS4 (10%) + AU Merit (90%)	Cereal Rye + Hairy Vetch	Mix	0.9	CD	2.3	A-D	1712	CD	4568	A-D	86	A-C	21	D-F	0	F	0	E
Yankee (20%) + Dixie (80%)	Cereal Rye + Crimson Clover	Mix	0.4	F-J	1.8	C-H	713	F-J	3528	C-H	60	E-I	12	D-F	3	D-F	3	D
Yankee (20%) + AU Merit (80%)	Cereal Rye + Hairy Vetch	Mix	0.4	F-H	2.0	A-F	883	F-H	3941	A-F	73	C-F	18	D-F	0	F	0	E
TN1902 (20%) + Dixie (80%)	Wheat + Crimson Clover	Mix	0.4	F-I	1.5	F-H	776	F-I	3052	F-H	84	BC	57	C	7	C-F	3	D
TN1902 (20%) + AU Merit (80%)	Wheat + Hairy Vetch	Mix	0.5	F-H	1.9	B-G	949	F-H	3779	B-G	95	AB	30	D-F	2	EF	0	E
Cereals
Average			0.8		2.1		1656		4225		43		11		2		2
Min			0.3		1.6		549		3104		34		7		0		2
Max			1.2		2.5		2497		4955		51		19		7		5
Range			1.0		0.9		1948		1850		17		12		7		3
Legumes
Average			0.2		0.9		419		1800		87		88		10		18
Min			0.0		0.4		94		826		55		63		0		0
Max			0.5		1.6		1019		3151		99		100		18		43
Range			0.5		1.2		925		2326		44		38		18		43
Brassicas
Average			0.2		0.6		423		1101		52		20		12		14
Min			0.1		0.5		277		1071		47		11		8		12
Max			0.3		0.6		601		1155		55		31		17		20
Range			0.2		0.0		324		84		8		20		8		8
Mixes
Average			0.6		1.9		1291		3821		74		24		2		2
Min			0.4		1.5		713		3052		58		8		0		0
Max			1.0		2.3		1996		4698		95		57		7		7
Range			0.6		0.8		1283		1646		37		48		7		7
Across Groups
Average			0.5		1.5		1021		2994		67		40		6		8
Standard Error			0.4		0.7		721		1393		22		35		6		12
Min			0.0		0.4		94		826		34		7		0		0
Max			1.2		2.5		2497		4955		99		100		18		43
Range			1.2		2.1		2403		4129		65		93		18		43
ANOVA p-values
– Variety			<0.001		<0.001		<0.001		<0.001		<0.001		<0.001		<0.001		<0.001
– Location			<0.001		N.S.		<0.001		N.S.		<0.001		<0.001		<0.001		<0.001
– Variety x Location			<0.001		<0.001		<0.001		<0.001		0.025		<0.001		<0.001		<0.001

† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation letters are highlighted in dark orange for values that are not statistically different from the highest value across all entries within a given trait. Mean values between the 50th and 75th percentile are highlighted in light orange, mean values above the 75th percentile are highlighted in dark orange. § For analysis, values transformed using (value)^2 due to non-normal distribution. Untransformed means and summary statistics are reported. ‡ For analysis, values transformed using log (value+1) due to non-normal distribution. Untransformed means and summary statistics are reported. ‡‡ Non-normal distribution, means reported ¶ Analyzed using near infrared spectroscopy (NIRS) with the appropriate calibration for each species. Reported on a 100% DM basis. †† Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

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Virginia Sykes

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Table 20. Early Nov. Planted, Knoxville, TN, Biomass and Weed Suppression

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