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| Effects of differrent nitrogen aplication amounts on dry mattercharacteristics of mechanized transplanted hybrid indica |
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| Abstract: |
| Super hybrid rice Zhunliangyou 527 and Q you 6 were used to research the characteristics of dry matter
of mechanized transplanted hybrid indica under 4 different N-fertilizer application rate. The results showed that with
the application rate of fertilizer-N improved，the highest stem tillers number，the height，the maximum seedlings and
the leaf area index increased gradually. At jointing stage，booting stage and heading stage，the stem/sheath ratio of dry
decreased gradually with increment of nitrogen application amount，whereas ratio of leaf dry matter were increased.
At maturity stage，the change law of stem/sheath ratio was not obvious，and the leaf area index increased with the
application rate of fertilizer-N improved，whereas the spike dry matter ratio were just the opposite. With the application
rate of fertilizer-N improved，the effective spikes，grains per spike and yield increased，and the grain weight，
setting rate first increased，and then decreased. There is a parabolic relation between nitrogen application amount and
yield under the tested condition，and the optimum nitrogen application amount and highest rice yield of mechanized
transplanted hybrid indica are 201.62 kg/hm2 and 8181.68 kg/hm2 respectively |
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