Table 24. Early Nov. Planted, Spring Hill, TN, Biomass and Weed Suppression

Table 24. 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 Middle Tennessee AgResearch and Education Center, in Spring Hill, Tennessee, and evaluated from Fall 2020 to Spring 2021.

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	0.7	A	1.6	A-C	1415	A	3282	A-C	63	BC	11	H	7	G	3	DE
Elbon	Cereal Rye	Cereal	0.6	AB	1.8	AB	1296	AB	3517	AB	66	BC	18	GH	7	G	2	EF
NF95319B	Cereal Rye	Cereal	0.7	A	1.8	A	1364	A	3638	A	57	BC	14	GH	7	G	3	DE
NF97325	Cereal Rye	Cereal	0.5	A-D	1.7	AB	1051	A-D	3387	AB	71	B	15	GH	8	FG	3	DE
NF99362	Cereal Rye	Cereal	0.6	A-C	1.5	A-D	1213	A-C	3052	A-D	53	C	15	GH	7	G	3	DE
Yankee	Cereal Rye	Cereal	0.4	D-G	0.9	E-G	721	D-G	1824	E-G	52	C	18	GH	17	D-F	8	CD
TN1902	Wheat	Cereal	0.4	D-H	0.8	F-I	711	D-H	1557	F-I	88	A	25	E-H	8	FG	8	CD
Legumes
Paradana	Clover, Balansa	Legume	0.1	J	0.1	K	214	J	204	K	100	A	100	A	95	A	73	A
Taipan	Clover, Balansa	Legume	0.1	IJ	0.2	I-K	267	IJ	481	I-K	100	A	100	A	97	A	70	A
Viper	Clover, Balansa	Legume	0.1	J	0.3	I-K	214	J	632	I-K	100	A	100	A	93	AB	87	A
Lightning	Clover, Berseem	Legume	0.1	G-J	0.3	H-K	287	G-J	653	H-K	100	A	100	A	85	B	38	AB
Dixie	Clover, Crimson	Legume	0.3	E-J	0.9	E-G	538	E-J	1798	E-G	99	A	96	A	17	D-F	12	BC
AU Merit	Vetch, Hairy	Legume	0.3	D-J	0.9	E-H	632	D-J	1782	E-H	96	A	90	A	17	D-F	2	EF
Patagonia	Vetch, Hairy	Legume	0.5	A-E	1.2	B-G	977	A-E	2420	B-G	96	A	53	BC	7	G	0	F
WinterKing	Vetch, Hairy	Legume	0.4	C-E	1.0	D-G	815	C-E	1965	D-G	95	A	95	A	10	E-G	2	EF
Brassicas
Vivant	Hybrid (turnip x rapeseed)	Brassica	0.1	H-J	0.2	JK	277	H-J	319	JK	93	A	95	A	97	A	82	A
Aerifi	Radish	Brassica	0.1	J	0.1	K	220	J	105	K	98	A	98	A	98	A	95	A
Jackpot	Turnip	Brassica	0.2	F-J	0.2	JK	345	F-J	361	JK	100	A	99	A	95	A	88	A
Mixes
Bates RS4 (20%) + Dixie (80%)	Cereal Rye + Crimson Clover	Mix	0.4	B-E	1.3	A-F	868	B-E	2540	A-F	86	A	21	F-H	12	D-G	5	CD
Bates RS4 (20%) + AU Merit (80%)	Cereal Rye + Hairy Vetch	Mix	0.5	A-D	1.3	A-F	1019	A-D	2571	A-F	95	A	41	B-F	5	G	0	F
Bates RS4 (10%) + Dixie (90%)	Cereal Rye + Crimson Clover	Mix	0.5	A-D	1.3	A-F	1030	A-D	2671	A-F	90	A	26	D-H	13	D-G	2	EF
Bates RS4 (10%) + AU Merit (90%)	Cereal Rye + Hairy Vetch	Mix	0.5	B-E	1.4	A-E	909	B-E	2739	A-E	90	A	46	B-E	8	FG	0	F
Yankee (20%) + Dixie (80%)	Cereal Rye + Crimson Clover	Mix	0.4	D-H	1.1	C-G	716	D-H	2158	C-G	93	A	37	C-G	20	D	5	CD
Yankee (20%) + AU Merit (80%)	Cereal Rye + Hairy Vetch	Mix	0.3	D-J	1.1	D-G	601	D-J	2117	D-G	92	A	48	B-D	10	E-G	0	F
TN1902 (20%) + Dixie (80%)	Wheat + Crimson Clover	Mix	0.4	D-F	0.7	G-J	742	D-F	1343	G-J	98	A	50	BC	35	C	8	CD
TN1902 (20%) + AU Merit (80%)	Wheat + Hairy Vetch	Mix	0.3	D-I	0.9	E-G	679	D-I	1829	E-G	95	A	60	B	18	DE	0	F
Cereals
Average			0.6		1.4		1110		2894		64		16		9		5
Min			0.4		0.8		711		1557		52		11		7		2
Max			0.7		1.8		1415		3638		88		25		17		8
Range			0.4		1.0		704		2080		36		14		10		7
Legumes
Average			0.2		0.6		493		1242		98		92		53		35
Min			0.1		0.1		214		204		95		53		7		0
Max			0.5		1.2		977		2420		100		100		97		87
Range			0.4		1.1		763		2216		5		47		90		87
Brassicas
Average			0.1		0.1		280		261		97		98		97		88
Min			0.1		0.1		220		105		93		95		95		82
Max			0.2		0.2		345		361		100		99		98		95
Range			0.1		0.1		125		256		7		4		3		13
Mixes
Average			0.4		1.1		821		2246		92		41		15		3
Min			0.3		0.7		601		1343		86		21		5		0
Max			0.5		1.4		1030		2739		98		60		35		8
Range			0.2		0.7		429		1395		13		39		30		8
Across Groups
Average			0.4		0.9		735		1882		87		57		34		23
Standard Error			0.2		0.5		371		1100		16		35		38		34
Min			0.1		0.1		214		105		52		11		5		0
Max			0.7		1.8		1415		3638		100		100		98		95
Range			0.6		1.8		1201		3533		48		89		93		95
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 24. Early Nov. Planted, Spring Hill, TN, Biomass and Weed Suppression

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