| Under the same environment and cultivated conditions,combined with integration research and model on fertility and efficient of corn in Jilin province,two varieties were discussed,which are fit of planting in Jilin Province,Ultra-High-Yield variety(Compact type)-Xianyu335 & common variety(Flat Type)-Sanbei9th, aboveground changes of physiological and biochemical indicators and root contributions to yield,according to different root-cutting treatments or not at loudspeaker period.The proportions of root-cutting are such as 1/4,2/4 and 3/4,the experiment was done on the experimental station of Jilin Agriculture University and Hongshi Town in Huadian City during 2006-2007.Randomized block design was adopted in this experiment; three repeats.Three densities were set up in the root-cutting treatment of Ultra-High-Yield variety.Some indexes were investigated in seeding stage on 11th July such as modality index,LA,LAI,LAD and chlorophyll content,dissolubility sugar,dissolubility protein,SOD activity,POD activity,MDA content,etc. Corn yield was measured after harvest.Results indicated:1.Constantly changes of LAI of individual plant were appeared during the procreated process,and very slowly at the beginning;then improve fast when corn went into jointing stage,the climax came up at the flowering stage;then reduced gradually.But at the whole procreated stage differences were come up in the different treatments,the tendency was about Xianyu335(No root-cutting)＞Xianyu335(root-cutting 1/4)＞Xianyu335(root-cutting 2/4)＞Xianyu335(root-cutting 3/4)＞Sanbei9th.Colony LAI changes were same to the single,and dramatically changes appeared in different treatments,Xianyu335(No root-cutting) LAI was higher than others which adopt treatments,such as 10.24%,19.51%,22.32%,43.77%. Ultra-High-Yield LAD was higher dramatically than other treatments,the result was Xianyu335(No root-cutting)＞Xianyu335(root-cutting 1/4)＞Xianyu335(root-cutting 2/4)＞Xianyu335(root-cutting 3/4)＞Sanbei9th.2.At the whole procreated stage,chlorophyll content appeared odd apex change,the apex came up at the grouting stage.The chlorophyll contents of root-cutting plants were under the no root-cutting varieties, however,the differences were not obviously between the no root-cutting varieties and root-cutting 1/4,and the chlorophyll contents of root-cutting 2/4 and 3/4 were both very low and very fast descendant.Total content results were:Sanbei9th＞Xianyu335(No root-cutting)＞Xianyu335(root-cutting 1/4)＞Xianyu335(root-cutting 2/4)＞Xianyu335(root-cutting 3/4).3.At the whole procreated stage,the dissolubility protein of the treatment of Xianyu335(No root-cutting) and Xianyu335(root-cutting 1/4) were higher obviously than the other treatments all the time.The result showed that leaves nutrition was good,and just the nutrition played a very important role to slow down the degradation of chlorophyll and improve the chlorophyll rates.Other treatments' LAI were low and chlorophyll rates were also very low owing to destruction of root system which resulted in nutrition was scared.4.At the whole procreated stage,SOD activities of all treatments showed odd apex changes,the apex came up at the spin stage,then reduce gradually,the changes' tendency were same,and reduce quickly for the varieties which were adopt root-cutting treatment.SOD activity of Ultra-High-Yield varity-Xianyu335 was higher common variety-Sanbei9th,but root-cutting's was less lowly than no root-cutting,and difference was least for the root-cutting 1/4.Conclusion was obtained through correlate analysis that the distinction was not notable between root-cutting 1/4 and no root-cutting,distinctions among other treatments were super notable.5.According to the compare of POD activity among different treatments,the conclusion was drawn that all of the apexes of POD activities came up on August 18th,the distinction was super notable between root-cutting treatment and no root-cutting.But the distinction between root-cutting 1/4 and no root-cutting was super notable at grouting stage,and it was not notable after the stage,the tendency was consistent with SOD activity.6.Among five treatments,the CAT activities of Ultra-High-Yield variety-Xianyu335 and root-cutting 1/4 treatment were more notable than other treatments.Reduced rate of CAT activity for root-cutting 2/4 treatment and root-cutting 3/4 treatment was more quickly than common variety-Sanbei 9th.Among different densities,CAT activities of 80 thousand plants per hectare were the most higher.The distinctions among C1,C2 and C3 were super notable,especially between C1 and C2.Spin stage of significant differences, after the two stages of the difference was not significant.7.According to the notable analysis,the changes of plants' MDA content were great at tassel ling stage for the treatment contra posed to root system was at the beginning,and the apex of MDA content came up on root-cutting 3/4 treatment,and the distinction between root-cutting 3/4 treatment and 2/4,the others were super notable.The distinction between root-cutting 1/4 treatment and no root-cutting treatment was not notable until grouting stage.The result showed that root of plants treated root-cutting 1/4 treatment resumed so great that it can maintained the normal metabolism,and it was also not premature senility and MDA content increased quickly,it is different from root-cutting 2/4 treatment's and root-cutting 3/4 treatment's.8.Before procreate period,the distinctions among accumulation of dry matters for each variety was not notable,it came up at spin stage,the order was:Xianyu335(No root-cutting)＞Sanbei9th＞Xianyu335(root-cutting 1/4)＞Xianyu335(root-cutting 2/4)＞Xianyu335(root-cutting 3/4).It illuminated that rates of accumulation of dry matters existed distinctions among different treatments and different procreate period,and the accumulation would be influenced after root-cutting treatment.9.The distinctions were not notable among different treatments of the amount,length and width for the corn spikes;the distinctions for the amount of grain,the length of bald tip,the weight of 100 grains and the weight of spike axis were super notable.And final result of yield was Xianyu335(No root-cutting)＞Xianyu335(root-cutting 1/4)＞Xianyu335(root-cutting 2/4)＞Sanbei9th＞Xianyu335(root-cutting 3/4),the distinction between the first two treatments was not notable,the latter three treatments' were also notable,but it was super notable between the first two treatments and the latter three treatments. |
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