| 【Objective】The effects of different planting densities on spring maize grouting, dehydration and yield
characters were studied to provide scientific basis for high-density planting and yield increase of spring maize in eastern
Hebei Province.【Method】The good varieties （Jingnongke 728 and MC812） with appropriate poling characteristics and
suitable for mechanical harvesting screened in early stage were selected to conduct tightness resistance test, and five planting
densities（60 000 plants/hm2, 67 500 plants/hm2, 75 000 plants/hm2, 82 500 plants/hm2 and 90 000 plants/hm2） were set.
The effects of different planting densities on grouting, dehydration and yield characters were studied.【Result】With the
increase of plating density, the spike number and yield of the two varieties showed an increasing trend, and both reached
the maximum under the density of 90 000 plants/hm2. The 100-grain weight of seeds showed a S-shaped（“slow-fast- slow”）upward trend during grain filling, the grain filling rate and dehydration rate showed a single-peak curve of“first rising
then falling”, and the time to reach the peak value was consistent with the changing trend, and the peak value appeared on
the 26th day after spinning. The rates of stem and bract dehydration showed a trend of decreasing first and then increasing. The
maximum dehydration rate and filling rate appeared at the planting density of 60 000-75 000 plants/hm2.With the increase of
silking days, the moisture contents of seeds, stems and bracts of the two varieties showed a“slow-fast-slow”decreasing trend
on the whole, and the moisture content under the planting density of 60 000-75 000 plants/hm2 was lower than that of 82 500-
90 000 plants/hm2.【Conclusion】To ensure high yield of spring maize in eastern Hebei Province, it is suggested that the
planting density is 90 000 plants/hm2. |
