稀土微肥对咖啡叶片氮素及碳素同化的影响

以塑料袋小粒种咖啡７－８月龄小苗对生叶为材料，取其中一片涂施稀土钼或硝酸稀土微肥作为处理，另一片涂清水为对照。结果表明：（１）处理叶片的氨基酸和可溶性蛋白质含量增加，稀土钼处理比对照分别增加１３％和６％；硝酸稀土处理则分别增加１２％和７％。（２）处理叶片的硝态氮含量减少，稀土钼处理比对照减少１４％；硝酸稀土处理则减少１３％。（３）处理叶片的叶绿素和可溶性糖含量增加，稀土钼处理比对照分别增加７％和９

EFFECTS OF RARE EARTH ON NITROGENAND CARBON ASSIMILATIONINLEAVESOFCOFFEAAKABICA

Foliar applicationofbag-raised7-8-month-old coffee trees(Coffea arabica)showedthatbothchelated rare earth molybdate and rare earth nitrate couldpromote nitrogen and carbonassimilation in leaves ofCoffea arabica. Coffea leaves treated with rare earth molybdate orrare earth nitrate showed an increased contentof free amino acids. solu ble sugars and pro-teins. and chlorophyll by 13%,9%,6%and 7%or by 12%,12%,7%and 8%separately.and a declined content of nitrate nitrogen by 14%or 13%as compared with the control. Cof-fea leaves treated with rare earth molybdate enhanced their photosynthetic rate by 8%andreduced their respiratory rate by 5%, and rare earth nitrate treated leaves enhanced photo-synthetic rate by 8.5%and reduced respiratory rate by 5.7%.