Effects of Planting Density on Stem Lodging Resistance and Grain Yield of Maize at Different Maturity Stages
An experiment was conducted to investigate the effects of planting density on stem lodging resis-tance and grain yield of spring maize at different maturity stages at the four planting densities with early-maturing variety SD650 and mid-late-maturing variety SD609 as experimental materials.The results showed that SD650 and SD609 reached the highest grain yields of 15 110 kg/ha and 18 056.67 kg/ha under the densities of 90 180 and 105 000 plants/ha.Compared with the SD609,SD650 had shorter and thicker stem nodes,shorter plant height and ear height,and stronger stem lodging resistance under dense planting.The node position,the stem puncture strength of the two hybrids decreased gradually with the increase of density.The stem puncture strength at the same node po-sition was SD650＞SD609,and the puncture strength at different nodes was the third node＞the fourth node＞the fifth node.Correlation analysis showed that grain yield was significantly negatively correlated with stem strength,in-ternode diameter and internode dry weight.The lodging rate was significantly negatively correlated with stem strength,dry weight per unit stem length,internode diameter and internode dry weight.It was significantly positively correlated with internode length,plant height,ear height and ear height coefficient.The internodes of the stalk of the early-maturing variety SD650 were short and thick,the dry weight per stalk length was larger,and the lodging resis-tance ability was stronger.Additionally,it had a higher effective ear number and grain number per ear,the yield was higher under high density.
NETL
NSTL
万方数据
