不同产量水平橡胶品种幼树的钙镁营养差异研究

Difference in Ca, Mg among rubber tree cultivars with different yield components

以7个不同产量水平橡胶品种的1年龄幼树为材料,研究了橡胶幼树的钙镁营养差异。结果表明:橡胶的产量水平与钙不存在显著相关性,与镁存在极显著正相关(除热研8-79外);在供试的7个橡胶品种中,热研8-79、粤390-1、东方93-114的钙镁含量较其他品种低;随着生长月份的延长,橡胶幼树的钙含量增加且在10月达到最大值,镁含量下降且在11月达到最小值。此外,与不施肥处理相比,施肥处理橡胶幼树叶片的钙含量上升、镁含量下降,其中所有品种的叶片钙含量都极显著增加,叶片镁含量除保亭3406、热研7-33-97的极显著减少外,其他品种差异不显著。

The difference in mineral nutritional was studied for seven rubber tree cuhivars with different yield components. The results obtained were as follow： No significant difference in correlation was found between different yield components and nutrient content in Ca, but had extremely difference correlation in Mg besides ReYan8-79. In the seven varieties, the Ca, Mg content of the leaf in the ReYan8-79, Yue390-1, DongFang93-114 were lowest. In the different months, the change of Ca content was increased and higher in October, but the change of Mg content was decreased and lowest in November. Compared the fertilized to unfertilized varieties, the content of Ca was increased by fertilized, but the content of Mg was decreased. There is extremely difference in Ca among varieties which using fertilizer; But some about BaoTing3406 and ReYan7-33-97 were extremely difference in Mg which unfertilized.