Relationship between agronomic characters and yield of grain forage maize in Tibet

In order to determine the main factors affecting the grain yield per plant，and provide academic evidence for introduction，breeding and cultivation of grain forage maize in Tibet，authors investigated the agronomic characters of grain forage maize，conducted correlation analysis，regression analysis and path analysis to study the relationship between 15 agronomic characters and grain yield per plant. The results showed that the main factors influencing yield per plant of maize were yield components，the major determining factors of yield per plant were 100-seed weight，panicles per plant，ear row and number of kernels per row. Coordinated development of yield components was the basis for high yield of maize. The external morphology of high yield grain forage maize in Tibet should have the characteristics of middle plant height，high weight per stem，more ears，big ear，weight ear，grain plumpness etc.