Can Leguminous Cover Crops Partially Replace Nitrogen Fertilization in Mississippi Delta Cotton Production?

Table 2

δN¹⁵ abundance in plant residues before desiccation in 2005–2007.

Cover crop	δN^15 abundance
	2005	2006	2007
None	4.38	5.10	5.00
Austrian winter pea	0.64	0.90	1.44
Hairy vetch	1.05	1.33	1.33
LSD0.05 year × cover crop	0.49