中文字幕综合_午夜视频h_国产猛男猛女超爽免费视频_男人的天堂中文字幕_国产精品99久久99久久久_久久免费精品国产_国产午夜福利精品一区_欧美不卡影院_无码中文字幕免费一区二区三区_www插插插无码视频网站

◆  What is the content and distribution of potassium in corps?

Potassium is the highest content metal element in higher plants. The content of potassium(K₂O) in plants is generally 1-5%. It exists in the sap of the cell in ions form or is absorbed on protoplasm.

◆  What are the nutritional functions of potassium?

1, Potassium is an activator of many enzymes;

2, Potassium can promote photosynthesis;

3, Potassium can promote nitrogen metabolism;

4, Potassium can increase crop resistance to disease and lodging.

◆  What are the common potassium fertilizer?

Potassium sulfate, potassium chloride, potassium nitrate,potassium phosphate, plant ash etc.

◆  What are the typical symptoms of potassium deficiency?

1, The plant growth is slow and short;

2, The stems are tender and easy to lodge, and the crop resistance to drought and cold resistance decreases.

3, When the plant lack of potassium seriously, the old leaves are chlorosis and necrosis, other leaves are dull dark green.