水是光合作用的原料之一,在营养上,水与二氧化碳及氮、磷、钾肥料等具有同等重要的意义。水是体内一切生化过程的介质,稻种发芽时,只有在水分充足的情况下,种子内贮藏的淀粉、蛋白质等才能经酶促反应水解成糖和氨基酸,供幼根、幼芽的耗用;呼吸作用,光合作用,器官的发生,组织的分化等,都必须有水才能正常进行。水又是植物生长中各种物质的溶媒,氮、磷、钾肥料以及各种无机养料,都必须先溶解于水才能 Water is one of the raw materials for photosynthesis. In terms of nutrition, water is of equal significance with carbon dioxide and nitrogen, phosphorus and potassium fertilizers. Water is the medium of all biochemical processes in the body. When the rice seeds germinate, the starch and protein stored in the seeds can be hydrolyzed into sugar and amino acids by enzymatic reaction only when the water is sufficient, for the consumption of young roots and buds ; Respiration, photosynthesis, organ development, tissue differentiation, etc., must have water to normal. Water is a medium for the growth of various substances in plants. Nitrogen, phosphorus, potassium fertilizers and various inorganic nutrients must be dissolved in water