钙离子是植物体内的营养元素之一。植物细胞中只有存在一定浓度的钙离子时,才能适应质外体溶液组成的较大变化;植物根系才能适应土壤溶液盐度及离子不平衡的环境。在分子水平上,钙离子直接或间接(以钙调蛋白形式)参与酶的激活作用或抑制作用。故钙离子控制着植物细胞内的许多生命活动,调节着植物的生长发育。最近,国外文献不断报道,在盐胁迫下,增施钙可以减轻氯化钠对植株根系生长的抑制。对棉株根系生长具有保护作用;对大麦幼苗生长和硝酸盐的吸收具有促进作用;水稻秧苗在移栽前,用钙盐处理诱导钙离子的积累,可推迟钠积累到中毒水平,有利于秧苗成活及早期生长;土壤中钙与钾的比例大于1时,玉米能更合理地利用土壤中的氮素,并有效地同化(?)的无机化合物。为了探索钙对作物抗盐性的影响,我们进行了如下盆栽试险:使用清洗干净的细沙,加入不同浓 Calcium is one of the nutrients in plants. Only a certain concentration of calcium ions in plant cells can adapt to the large changes in the composition of the apoplast solution; plant roots to adapt to soil salinity and ion imbalance in the environment. At the molecular level, calcium ions participate directly or indirectly (in the form of calmodulin) in the activation or inhibition of the enzyme. Therefore, calcium ions control many of the life activities of plant cells, regulating the growth and development of plants. Recently, foreign literature continues to report that, under salt stress, increasing calcium can reduce the inhibition of root growth by NaCl. It has the protective effect on the growth of cotton plant roots and promotes the growth of barley seedlings and the absorption of nitrate. Before the transplanting, rice seedlings treated with calcium salt to induce the accumulation of calcium ions can delay the sodium accumulation to the poisoning level, which is in favor of the seedlings Survival and early growth; when the ratio of calcium to potassium in soil is greater than 1, maize can use nitrogen in soil more reasonably and assimilate (?) Inorganic compounds effectively. In order to explore the impact of calcium on the salt resistance of crops, we carried out the following potting trial insurance: Use clean sand, adding different concentrations