Amounts of R and B seed for medium-level seed abundance were significantly higher than those for low-level seed abundance; amounts of II, R and B seeds for high-level seed abundance were all significantly higher than those for low-level seed abundance, but the amount of E seed for high-level seed abundance was significantly lower than that for low-level seed abundance; amounts of II, R and B seeds for high-level seed abundance were all significantly higher than those for medium-level seed abundance, but the amount of E seed for high-level seed abundance was significantly lower than that for medium-level seed abundance (Table  2 ) (Fig.  1 a).

Weights of II and R seeds for medium-level seed abundance were significantly higher than those for a low level of seed abundance; weights of II, R and B seeds for a high level of seed abundance were all significantly higher than those for a low level of seed abundance, but the weight of E seeds for a high level of seed abundance was significantly lower than that for a low level of seed abundance; the weights of II, R and B seeds for a high level of seed abundance were all significantly higher than those for a medium level of seed abundance, but the weight of E seeds for a high level of seed abundance was significantly lower than that for a medium level of seed abundance (Table  2 , Fig.  1 b).