混种密度比例对小黑麦品种竞争系数的影响

Influence of Density Ratios in Mixed Planting on Competitive Indexes of Triticale Cultivars

研究了2个新疆小黑麦品种在单播和不同密度混播条件下的产量,探讨小黑麦品种间竞争给对方产量的影响与初始密度比例的关系,并建立了密度比例与竞争系数变化的函数方程。结果表明:竞争系数随竞争品种密度比例变化而变化,这种变化在本研究中表现出对数回归方程的函数关系;"新小黑麦4号"比"新小黑麦5号"具有更强的占有和利用共同资源的能力,具有更强的竞争优势。混播组合有一定的增产效应,在小黑麦种子生产中,利用混合品种是可行的。在杂交组合的株高严重分离世代,选择株高不同的单株时一定要充分估计株高竞争优势对产量性状的影响。

The grain yields of two triticale varieties were investigated under different densities in mixed planting and in monoculture,influence of competition between varieties of Triticale yield to each other and the relationship between the initial density ratio was explored,and established function equation of the density ratio changes with the competitive indexes.The results showed that the change of competitive indexes changes with the change of density ratios of competitive cultivar.The change in the present study demonstrates the function of the Logarithmic regression equation;Xinxiaoheimai 4 was a superior competitor in mix-ture,which has a higher ability to acquire and utilize the same resources compared with that of Xinxiaoheimai 5.In Triticale seed production,the use of mixed variety is feasible.When hybrid combination high serious separation generation,select plant height different individual must adequately high competitive advantage on yield.