三、根据分蘖成穗规律的叶龄模式,确定基本苗数和群体动态 (一) 适宜基本苗数的确定适当减少基本苗数,必须以满足适宜的穗数(y)为前提,并根据单株可靠的成穗数(ES),确定适宜的基本苗数(x)。即:x=y/ES 单株可靠成穗数(ES)取决于品种的有效分蘖可靠叶龄期及其按同伸规则应有的理论茎蘖数(R),以及茎蘖的发生率(r)。故:x=y/R·r Third, according to tillering law of leaf age model to determine the basic seedlings and population dynamics (A) to determine the appropriate number of basic seedlings appropriate to reduce the number of basic seedlings must be to meet the appropriate number of spikes (y) as the premise, and according to the single Stable number of spikes per plant (ES), to determine the appropriate number of basic seedlings (x). Namely: x = y / ES Reliable spike number per plant (ES) Dependent on the effective tillering of the cultivars Reliable leaf age and its theoretical number of stems and leases (R) according to the same extensor rule, and the incidence of stem and tiller r). Therefore: x = y / R · r