《Table 1 Results of plant productivityunder different planting density and row spacing treatments》

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《Effects of Planting Density and Row Spacing on Plant Productivity of Autumn Forage Sweet Sorghum in Hebei Province》

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It could be seen from Table 3 that with the planting density of Nengsi 1 increasing from 75 000/hm2to 525 300 plants/hm2，the fresh weight per plant decreased from 602.74 to 79.73 g/plant，and the dry weight per plant decreased from 135.90 to 18.25g/plant.The differences reached the very significant level，indicating that the planting density had a significant effect on the productivity of single plant.Nengsi 1 had the highest productivity under the planting density of 75 000/hm2（Fig.1）.Under the planting density of 75 000/hm2，its fresh weight per plant（602.74 g/plant）increased by 42.41%-86.77%compared with other planting densities，and its dry weight per plant（135.90g/plant）increased by 41.79%-86.58%compared with other planting density，exhibiting very significant differences.The planting density，225 000 plants/hm2produced a middle productivity.Under the planting density of 225 000 plants/hm2，the fresh weight and dry weight per plant were 347.12 and 79.11g/plant，respectively.The fresh weight per plant decreased by73.64%compared with the planting density of 75 000/hm2，but increased by 48.35%and 77.03%compared with the planting densities of 375 000 and 525 300 plants/hm2，respectively，with very significant differences.The dry weight per plant decreased by71.79%compared with the planting density of 75 000/hm2，but increased by 49.74%and 76.94%compared with the planting densities of 375 000 and 525 300 plants/hm2，respectively，with very significant differences.Under the planting density of 525 300plants/hm2，the productivity was the lowest.Specificity，the fresh weight and dry weight per plant were 79.73 and 18.25 g/plant，respectively，and compared with fresh weight and dry weights under other planting densities，the value decreased remarkably，with very significant differences.The results showed that with the planting density increasing，the population competitiveness of Nengsi 1 increased，which inhibited the yield increasing potential of single sweet sorghum plant，resulting in reduced plant productivity.