橡胶树自育新品种高比区生长量、产量及抗寒性鉴定

Identification on the Increment,Yield and Cold Resistance of Nine New Self-fertile Rubber Clones on Large Scale

对1992年种植的云研系列9个品种在高级试验系比的观察结果表明,生长量较对照RRIM600高的是云研73-477,20龄树150 cm处平均围茎74.2 cm,为对照RRIM600的106.9%,生势中等,其余品种均较对照生长慢;产量较高的是云研76-235、云研80-1983、云研78-768,11割年平均单株产胶量分别为4.5、4.4、4.3 kg,为对照RRIM600的137.4%、134.2%、130.7%;参试的9个品种死皮均较对照RRIM600重,为不耐刺激割胶品种;抗寒性方面,除云研73-477与对照GT1相当,属中等抗寒品种外,其余品种均比对照RRIM600弱,为不抗寒品种。

Comparative experiment of nine rubber varieties planted in 1992 was conducted on large scale.Compared to control(RRIM600),the increment of Yunyan 73-477 was high and its average stem girth of 19-year tree was 73.01 cm at 150 cm above the ground,which was 108.52%of the control with a medium growth,while the other varieties grew slower than the control.The yield of Yunyan 76-235,Yunyan 80-1983 and Yunyan 78-768 were higher,with an individual average latex yield of 4.5kg,4.4kg and 4.3kg respectively at 11 tapping ages,which was 137.4%,134.2%and 130.7%respectively compare with that of the control.Nine tested varieties had more severe tapping panel dryness than the control,manifesting the intolerance to tapping stimulus.As to the cold resistance,Yunyan 73-477 was equivalent to the control GT1,belonging to medium cold-resistant variety,while the others were weaker than the control and belonging to non-cold resistant varieties。