水稻群体是由各个单株个体构成的，而单株个体又是由主茎不同的一次分蘖节位构成；
The rice population are made up of individuals, whereas every individual rice plant are made up of main stem and tillers of different nodes on it.
结果表明：盐碱胁迫推迟了一次分蘖的时间，降低了水稻分蘖数和有效分蘖数约50 %。
The results showed that salinity - alkalinity stress postponed the beginning time of the first tiller, reduced by 50 % of tiller number and effective tiller number.
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