亚洲国产天堂久久综合_少妇爆乳高潮无码专区_日本欧美麻豆精品_国产女人与黑人在线播放

12.5 nitrogen N-0-38 potassium oxide K2O+2.5 magnesium oxide MgO
Potassium is an activator of many enzymes.
Improving plants absorpt and utilize the nitrogen.
Magnesium is a component of chlorophyll.