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春种一颗籽,秋收万粒禾。农作物是怎么长大的?生长的原料和动力是什么?这是自古以来人们极感兴趣的问题。很多试验证明,植物的根、茎、叶、籽实都是在矿物质肥料参与下,通过植物叶子内的叶绿素利用日光能将水分与从空气中吸收来的二氧化碳化合形成的。植物除去水份之后干重的90—95％都来源于空气中的二氧化碳。在燃烧柴草的时候,留下来的灰量是很少的。这些灰就是植物吸收的占干重5—10％的氮、磷、钾等灰
Spring seed, autumn harvest million grain Wo. What is the growth of crops? What are the raw materials and motivation for growth? This is an issue that people are greatly interested in since ancient times. Many experiments have proved that the roots, stems, leaves and seeds of plants are formed by the combination of mineral fertilizers and sunlight through the chlorophyll in the leaves of plants to combine with the carbon dioxide absorbed from the air. 90-95% of the dry weight of the plant after it has been removed from the water is derived from the carbon dioxide in the air. When burning firewood, the amount of ash left is very small. These ashes are plants that absorb 5-10% of the dry weight of nitrogen, phosphorus, potassium and other ash