[Population physiological indices on density-tolerance of maize in different plant type].

Taken maize in two plant types of compact-type and flat-type as research object, the relationships between density-tolerance and light distribution in population, indices of productivity(LAI, NAR, and CGR), and population sink-source were studied synthetically by means of crop growth analysis method. The results showed that light distribution in population was the chief index to measure density-tolerance of different maize varieties. The kinetic rules of LAI, NAR, and CGR were the basic feature reflecting density-tolerance. The correspondent relationship in population sink-source was a comprehensive index to appraise density-tolerance of different maize varieties.