棉花品种对缺硼的敏感性及其硼效率的研究

A STUDY ON THE B-UTILIZING EFFICIENCY AND B-DEFICIENCY SUSCEPTIBILITY OF DIFFERENT COTTON CULTIVARS

在土壤含热水溶性硼为０．０９ｍｇ／ｋｇ（－Ｂ）与外加硼至１．０ｍｇ／ｋｇ（＋Ｂ）的条件下，盆栽７０个陆地棉（ＧｉｏｓｙｐｉｕｍｈｉｒｓｕｔｕｍＬ）品种，以检验品种间对缺硼敏感性差异。结果表明，７０个品种的地上部干物重敏感系数（－Ｂ／＋Ｂ×１００）为２６．６～１０２之间。如以其干物重敏感系数小于５０为缺硼敏感品种，大于９０为不敏感品种，获得敏感品种３个，不敏感品种５个。在缺硼条件下叶片硼效率（单位硼所产生的干物重）与缺硼敏感系数相关性达５％水准，不敏感品种硼效率高，敏感品种硼效率低。但无论缺硼与否。

Under boron deficient(-B,HWSB of the applied soil 0.09 mg/kg)and normal(+B,added to 1.0mg/kg)conditions, this experiment was conducted to study the susceptibility of 70 cotton cultivars[Giossypium hirsutum.L]in response to B deficiency. The results showed that there were apparent differences among the cultivars and the dry weight susceptibility coefficient of the shoots[(-B+B)×100]fluctuated between 26.6 and 102.3 boron sensitive cultivars whose coefficients were less than 50 and 5 non-sensitive whose coefficients were more than 90 were selected.It was also found that the B-using efficiency had significant relationship with B deficieny sensitivity when the cultivars were under the B deficient condition.In this situation,The B-using efficiency of the non-sensitive was high and that of the sensitive low. However,the amount of B-uptakig of different cultivars did not change much with the sensitivity of B dificiency.