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一株麦苗的主茎和各分蘖的心叶(-1叶)和它里边的一片叶(-2叶)的长度比率,称为-1/-2叶差距。以叶差距为指标反映分蘖、蘖群和植株的生长势,即叶差距小,表示当时和进一步的生长趋势是增强;叶差距大,则表示减弱。一个蘖群中各个分蘖的生长势,在分蘖期,一般表现为子蘖优势,但也有的蘖群和植株表现为亲蘖优势,这一差异可以考虑用于反映品种的分蘖力强弱,和反映体内生理状况和环境条件的影响;在分蘖两极分化期,一般地表现为亲蘖优势,用-1/-2叶差距在各蘖间的差异增大,可以表示分蘖两极分化程度,反映当时和前一时期体内外条件的影响。在分蘖两极分化前(返青到起身)中(起身到拔节)期,-1/-2叶差距大于10可作为判断无效分蘖的指标。
The ratio of the length of one main leaf of a plantlet to each leaf of tiller (-1 leaf) and one leaf (-2 leaf) inside it is called the -1 / -2 leaf gap. Leaf gap as an indicator of tillers, tillers and plant growth potential, that leaves a small gap, said the then and further growth trend is enhanced; leaves a large gap, then said weakened. The growth potential of each tiller in one tillering group usually shows the tillering advantage at tillering stage, but some tillers and plants show the advantage of tillering tillering. This difference can be considered to reflect the tillering ability of varieties and Reflecting the influence of physiological conditions and environmental conditions in vivo. In the period of tillering and polarization, it generally showed the advantage of tillering. The difference in tillers with -1 / -2 leaf gap increased, which could indicate the degree of tillering polarization, And the previous period of in vitro and in vivo conditions. Before tillering polarization (turning green to get up) (getting up to jointing), -1 / -2 leaf gap greater than 10 can be used as an indicator to determine the ineffective tillering.