高海拔旱作区马铃薯密度对植株性状及产量的影响

Effects of plant density on potato traits and yield in high altitude arid area

通过在高海拔旱作区马铃薯不同密度的试验,研究了马铃薯产量及其性状与种植密度的关系。结果表明,在研究密度范围内,马铃薯的产量随着密度的增加而升高;当密度达到一定程度时,随着密度的增加,产量反而下降,二者呈二次曲线模式变化Y=12 487.475+5 160.417 2X-236.968 6X2。马铃薯在高海拔旱作区较佳的种植密度为7.5×104株/hm^2。密度与株高之间为正相关,函数曲线是逆模型Y=96.566-85.513/X,单株结薯重量、商品薯率2个性状与密度之间呈负相关,函数模型均为性状指标随密度的增加而减少的二次曲线。商品薯率与单株结薯重量之间呈正相关,商品薯率随着单株结薯重的增大而升高,株高与商品薯率、单株结薯重之间呈负相关关系,株高增加,商品薯率、单株结薯重下降。

The relationship between potato yield,other traits and plant density were studied in high altitude arid area by plant density test.The results showed that potato yield increased with the increase of plant number in a proper range,but it decreased with the increase of density when the density reached a certain level.The plant yield and numbers showed a conic model change as Y=12 487.475+5 160.417 2X-236.968 6X^2,where X and Y ware plant numbers and yield,respectively.A positive correlation was found between plant height and density,the equation was Y=96.566-85.513/X.The optimal density was 75 000 plant per hectare for the best yield in high altitude arid area.The density was negatively correlated with weight per plant and commodity rate,while the function models were conic curves that decreased with the increase of density.There was a positive correlation between commodity rate and the weight per plant,while there was a negative correlation between the plant height and weight per plant and commodity rate.Plant height increased,the rate of commercial tuber and the weight of tuber per plant decreased.