作物是用根表面上的一种叫“氢离子”和“碳酸氢根离子”,去和土壤中的营养离子进行交换,从而实现养分吸收的。在吸收养分过程中,土壤中的营养离子被吸附到根的表面上,然后根细胞中氢离子及碳酸氢根离子和营养离子交换,使营养离子由根的表面进入根内部,再转运到其他器官中去,以满足作物生长发育的需要。 作物根表面上的氢离子及碳酸氢根离子,是由根呼吸时放出来的碳酸气,遇水发生作用形成碳酸再从其中离解出来的。氢离子供交换钾、铵、钙、镁等阳离子用;碳酸氢根离子,是供交换硝酸根、磷酸根等阴离子用的。 从作物吸收营养的过程看,要使作物很好地吸收养分和获得高产,一要采取耕作措施,使土壤疏松,通气良好,供给根足够的氧气,以促进根 Crops use nutrients on the surface of the roots called “hydrogen ions” and “bicarbonate ions” to exchange nutrients in the soil to achieve nutrient absorption. During nutrient uptake, the nutrient ions in the soil are adsorbed onto the surface of the roots, and the hydrogen ions and bicarbonate ions in the root cells exchange with the nutrient ions, allowing the nutrient ions to enter the roots from the surface of the roots and transport them to other Organs to meet the needs of crop growth and development. Hydrogen ions and bicarbonate ions on the surface of crop roots are the carbonated gases that are released by the roots when they breathe. When they react with water to form carbonic acid, they dissociate. Hydrogen ions for the exchange of potassium, ammonium, calcium, magnesium and other cations; bicarbonate ions, for the exchange of nitrate, phosphate and other anions. From the process of crop nutrient absorption, to make the crop absorb nutrients well and obtain high yield, it is necessary to take tillage measures to loosen the soil, aerate well and supply enough oxygen to promote root