稀土元素对橡胶树的效应研究 Ⅰ.产胶效应与皮施技术

研究结果表明:(1)稀土元素对橡胶树的增产效果显著,可使干胶产量提高4.71～16.67%,干胶含量提高0.10～1.52%。(2)稀土水剂皮施的增产效果均达显著水平,而以0.5%硝酸稀土水剂每1～2月喷洒一次的效果最佳;(3)对允许施行乙烯利刺激的胶园,可采用2%乙烯利+1%稀土混合水剂涂施;(4)涂施高浓度稀土油剂会产生生产性危害。

EFFECTS OF RARE EARTH ELEMENTS ON THE PARA RUBBER Ⅰ.Yield Effects with the Bark Applications

Results obtained showed that:(1)Rare earth elements in pro- moting rubber yield is stable and significant and increased the dry rubber contents in the latex up to 0.10-1.52%.Repeated yearly applications did not affect the girth of trunk growth and the healthy condition of the bark. Furthermore,the quality of the dry rubber remained in good condition and no bad effects had appeared in the investigation.(2)The application of nitrat- ed rare earth element in aqueous solutions either spraying the bark or sme- aring on the operated surface is well recommended.(3)In the rubbur plantation Which allowed to apply ethephon,the application of mixture(2% ethephon+1% rare earth)in aqueous solutions smearing on the operated surface can be used.(4)The application of rare earth in oil emulsion sme- aring on the operated surface resulted in the damage.