种植密度对苦荞麦抗倒伏特性及产量的影响

The Effect of Planting Density on Lodging Resistance and Yield of Tartary Buckwheat

为了明确苦荞麦抗倒伏特性和适宜的种植密度，提高产量，以‘西荞1号’苦荞麦为材料，研究了不同种植密度对苦荞麦抗倒伏特性及产量的影响。结果表明：种植密度大小显著影响茎秆和根系形态，随着种植密度的增大，田间透光率降低，株高和节间长度增加，主根长、一级侧根数和根体积减少，倒伏率增加，产量呈先升高后降低的变化趋势。相关分析发现，苦荞麦茎秆和根系的特征与植株的抗倒伏特性密切相关。株高和节间长度与茎秆强度呈显著的负相关关系，与倒伏率则呈显著的正相关关系。适宜的种植密度（9×105～12×105株／hm2）能够减少荞麦倒伏的发生，提高抗倒能力，增加群体产量，值得推广应用。

To investigate the lodging resistance and appropriate planting density, increase yield of tartary buckwheat, the ＇Xiqiao 1＇ cultivar was used to evaluate the effect of different planting densities on stem characteristics, lodging resistance and yield of tartary buckwheat. Results showed that different planting densities significantly effected characters of stem and root. With the increasing of planting density, the light transmittance, the main root length, number of first lateral root and root volume decreased, the plant height, internode length and lodging rate increased, but the yield displayed an acceleration first and then deceleration. The correlation analysis indicated that the characters of stem and root were intimately correlated with plant resistance to lodging. The plant height and internode length were significantly negatively correlated with stem breaking strength, but positively correlated with lodging rate. Therefore, appropriate planting density （9 ×105-12 × 105 plant/hm2） reduced the lodging rate, improved the resistance to lodging and increased the population yield, and it deserve applying extends.