plant density.We conclude that grain yield in Northeast China might be increased by increasing plant density from the current farmers' plant density of 6.0 plants m2–7.5 plants m2 in ZD 958 but might be kept the same in Pioneer 335
plant density.We conclude that grain yield in Northeast China might be increased by increasing plant density from the currentfarmers' plant density of 6.0 plants m2–7.5 plants m2 in ZD 958 but might be kept the same in Pioneer 335