（1）铜的营养作用

The nutritional function of copper

铜在作物体内含量甚微，一般为10～100mg/kg，  主要分布在植物幼嫩部分。种子、新叶中含铜较多，老叶和茎中含量则较少。

The content of copper in the plant is very small, generally 10-100mg / kg, mainly distributed in the tender part of the plant. The content of copper in seeds and new leaves was higher than that in old leaves and stems.

1）铜是作物体内某些氧化酶的组分，如抗坏血酸氧化酶，多酚氧化酶等，对氧化还原反应起催化作用。

Copper is a component of some oxidases in the body, such as ascorbic acid oxidase, polyphenol oxidase, etc., which plays a catalytic role in redox reaction.

2）铜能提高叶绿素的稳定性，避免过早遭受破坏，促进叶片更好地进行光合作用。因此缺铜叶片易失绿，从幼叶的叶尖开始，以后干枯，禾谷类作物不能结实。

 Copper can improve the stability of chlorophyll, avoid premature damage, and promote better photosynthesis in leaves.Therefore, copper leaves are easy to lose green, starting from the tip of young leaves, and then dry up, grain crops can not be strong.

（2）植物缺铜的症状

Symptoms of copper deficiency in plants

植株的缺铜症状一般较不明显，同镁、锰、锌等比较起来，缺铜往往没有典型症状。铜在作物体内也较难转移，所以缺铜一般先在幼嫩部位表现出来。

Symptoms of copper deficiency in plants are generally less pronounced, and copper deficiency is often asymptomatic compared with magnesium, manganese, and zinc.Copper is also difficult to transfer in plants, so copper deficiency usually shows up first in young plants.

果树缺铜常产生梢枯病。果树顶叶成簇状，严重时顶梢枯死。患缺铜症状的果树，果实品质恶劣，严重者果实开裂，果皮上有胶状分泌物，并提早脱落。

Lack of copper in fruit trees often causes shoot blight.Fruit trees into clusters of parietal leaves, serious when the top die.Fruit trees suffering from copper deficiency symptoms, poor fruit quality, severe fruit cracking, gum secretion on the pericarp, and early fall off.