两个新品种橡胶树叶片养分周年变化规律研究

Study on annual changes of leaf nutrient in new Hevea brasilensis varieties

通过对热研8-79、热研7-33-97两个新品种和老品种PR107(对照)开割橡胶树叶片矿质养分周年变化规律的分析,结果表明:不同品种间叶片的矿质营养有显著差异或极显著差异,热研7-33-97氮含量显著高于热研8-79和对照PR107,热研7-33-97和热研8-79磷含量显著高于PR107,PR107钙含量极显著高于热研7-33-97和热研8-79,镁含量热研8-79极显著高于热研7-33-97和PR107,新老品种间钾含量差异不显著。不同品种橡胶树叶片中的氮、磷、钾含量4～12月总体均呈下降趋势,而钙含量表现为逐渐增加,镁的变化比较平缓,且每年的7、8、9月叶片的矿质养分最接近年平均值。

By Reyan 8-79,SCATC7-33-97 Two new varieties and old cultivars PR107（control） to the tapped rubber leaf mineral nutrient analysis of annual variation,the results showed that： among the leaves of different varieties of mineral nutrition significant difference or significant difference,SCATC7-33-97 N content was significantly higher than the Reyan 8-79 and control PR107.SCATC7-33-97 and Reyan8-79 P content was significantly higher than PR107.PR107 Ca content was significantly higher than SCATC7-33-97 and Reyan 8-79.Mg content Reyan 8-79 was significantly higher than SCATC7-33-97 and PR107.New and old varieties no significant difference in K content.Leaves of different varieties of rubber film of N,Pand K in 4 to 12 months showed a general downward trend,while the Ca content was gradually increased,Mg in gently,and leaves each year on mineral nutrient 7,8,9 closest to the annual average.