Spring-Interseeded Winter Rye Seeding Rates Influence Weed Control and Organic Soybean Yield

Table 3

Effect of winter rye seeding rate on soybean, winter rye, common waterhemp, ivyleaf morningglory, and total weed density in 2002 and 2003. Data were combined over years and row spacings unless denoted otherwise.

	Soybean		Winter rye		Common waterhemp			Ivyleaf	Total weed
Rye seeding rate	2002	2003	2002	2003^b	Wide-row	Narrow-row low	Narrow-row high	morningglory	density
(kg ha^−1)	No. m^−2
Weedy check	32	17	0	0	82	36	55	5	86
67	35	39	4	0	1	10	3	0	20
134	33	32	9	0	1	5	6	1	21
200	27	32	22	0	0	3	1	5	30
Weed-free	33	37	0	0	0	0	0	0	0
LSD (𝑃=.05)	NS	8	1	NS^a	19			4	17

^aAbbreviations: NS: nonsignificant.
^bWinter rye emerged in the spring and died over the summer as in other research [6].