Table 1 Design of field experiment I and fertilizing

Oats (Control)

Spring wheat (SW)

Spring barley (SB)

Oats

GCM

Spring wheat (SW)

Spring barley (SB)

Oats

GCM

Spring wheat and undersown white clover (SW + WC)

WC mass^a

Spring barley (SB)

Oats and undersown red clover (O + RC)

RC mass^a

Spring wheat (SW)

Spring barley (SB)

Mixture of oats and pea (O + P)

Spring wheat (SW)

Spring barley (SB)

Pea (P)

Spring wheat (SW)

Spring barley (SB)

Red clover (RC)

RC mass^a

Spring wheat (SW)

Spring barley (SB)