Copper in soil There is generally no lack of copper in soil, but there is often a lack of copper in sandy soil.
土壤中的铜 土壤中的铜一般并不缺乏，但沙土常有缺铜现象。
When plants lack copper, they will cause green deficiency, and young leaves will first turn yellow.
植物缺铜时会引起缺绿症，幼嫩叶片首先发黄。
3. Boron in soil Generally, the available boron content in soil is very small.
3.土壤中的硼 一般土壤中有效硼含量很少。
The
boron content of soil in arid area is more than that in humid area, and
the boron content of soil in coastal area is more than that in inland
soil.
干旱地区土壤含硼量要比湿润地区土壤多，沿海地区土壤含硼量又比内陆土壤多，而山区丘陵酸性土壤则往往缺硼。
When the soil lacks boron, it will cause crops to "flower and not bear fruit" and "bud and not flower".
当土壤缺硼时，会引起作物“花而不实”、“蕾而不花”。
4. Molybdenum in the soil of North China Loess Plateau, North China Plain, Huaibei Plain and
4.土壤中的钼 我国北方黄土高原、华北平原、淮北平原和
The south of Jiangsu belongs to low molybdenum area.
苏南地区属于低钼地区。
When the content of available molybdenum in soil is lower than 0.15 ~ 0.2 mg/kg, plants show molybdenum deficiency.
土壤中有效钼含量低于0. 15~0. 2毫克／千克时，植物表现出缺钼。
Molybdenum deficiency in plants can also cause nitrogen deficiency, short plants and yellow-green leaves.
植物缺钼又可引起缺氮，植株矮小，叶片黄绿色。
