【摘要】 <正> 水稻的出叶,与分蘖发生、根系生长、节间伸长和充实,以及穗分化发育进程之间,存在有规则的同伸关系。水稻每出一片叶,即生长部位每上升一个节位,都定位地形成和生长着相应的器官。因此,水稻可说是属于“节律型”生长,可根据其叶更多还原

【Abstract】 Six leaf-age-models of development process were formulated in different rice varieties of earliest-, earlier-, middle-, late- maturities and in IR genotype by observing the synchronous relations between the leafing and the tillering, internodc elongation and panicle differentiation of more then 70 varieties of hsien （indica） and keng（japonica）. It was also confirmed that the number of the total leaves of main stem （N） minus the number of intcrnodes （n） leaf-age-period as the critical leaf-age-period of effective tillering;the elongation of the lst internodes from the basics of varieties with 4, 5, 6 and 7 elongated internodes started when the 2nd, 3rd, 4th and 5th leaves from the uppermost were sprouting respectively.Based on the optimum number of panicles per mu （Y）, the critical leaf-age-period of effective tillering （N-n）, the leaf-age of the transplanted seedling （SN）,the number of the tillers with more than 3 leaves （t₁） and less than 2 leaves （t₂） per seedling, the emergence rate of tillering during the effective tillering period（r₁） and the rate of survival tiller with under 2 leaves after transplanting （r₂）, an experimental formula for estimating the optimum number of basic seedling per mu （X） was established as follows: X=（Y/（1+t₁）[1+（N-n-SN-1-a）r₁]+ t₂r₂）)According to the leaf-age-model of development process in rice mentioned above, the techniques of fertilizing, irrigating and drying the fields for high-yielding cultivation of different varieties of rice were also discussed. Production practice in 1980-81 showed that it was feasible to use the leaf-age-model to direct high-yielding rice cultivation.更多还原