不同基因型甜菜吸磷能力的研究

通过盆栽和田间框栽甜菜吸磷能力的试验表明:1)低磷促进甜菜根系生长速率和根长的增加,但不同基因型间的这种促进程度和出现的时间各异;2)不同基因型甜菜的吸磷能力差异显著,主要表现在对土壤全磷和有机磷的吸收速率和吸收量等方面,特别是在低磷胁迫条件下,对土壤有机磷的吸收不同基因型间的差异更加突出;3)不同基因型甜菜对磷的吸收能力和磷素营养的经济利用效率并不吻合,在幼苗期吸磷能力较强的基因型具有较高的磷素经济利用效率。

The Ability of Absorbing Soil Phosphor between the Different Sugar Beet Genotypes

The absorbing abilities of sugar beet to soil phosphor were studied under the conditions of field sash or pot culture,and the results demonstrated that: 1) lower P applying rate stimulated the roots growth rates and the roots length,but the stimulating degree and the appearing time of this effects were genetic dependent;2)the abilities of absorbing soil phosphor significantly varied in different sugar beet varieties,which mainly showed in the aspects of the absorbing rates and quantity of soil total P and organic P,especially under the condition of P stress,the abilities of absorbing soil organic P between genotypes were more significant differences;3)the abilities of absorbing soil P for all the varieties used in the experiment were not in coordinated with the economical efficiencies of using P element,but the variety with a higher absorbing genotype had a higher absorbing ability at the seedling stage.