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俗话说:“积肥如积粮”,“春天肥满坑,秋后粮满仓。”肥料能给农作物提供所需的各种营养元素,并可提高土壤肥力和改善土壤结构。但这并不是说肥多了粮食就会收得多,还要看肥料是否用得适当。要“按土施肥”,即根据不同的土壤、不同的作物施用不同的肥料。氮、磷、钾等各种肥料要适当配合,不仅要多施肥,还要讲究施肥方法,以提高肥效,确保农业稳产高产。作物的正常生长和发育所需要的营养物质由碳、氢、氧、氮、磷、钾、钙、镁、硅、铁、硫、硼、锰、铜、锌、钼等几十种元素所组成,其中对碳、氢、氧的需求量极大。但是三者从不感到缺乏,这是因为氢、氧这二个元素互相结合便成为水,以雨雪的形式或人为方法经常降落在上壤中,根系就能不断汲取,满足植物体内包括蛋白质、脂肪与碳水化合物对氢和氧的需要。碳的
As the saying goes: “Accumulation of fertilizer such as plot grain,” “spring plump pit, autumn full grain grain.” Fertilizer can provide crops with all the nutrients needed, and can improve soil fertility and improve soil structure. But this does not mean that more fertilizer will receive more, depending on whether the fertilizer is properly used. To “soil fertilization”, that is, according to different soil, different crops using different fertilizers. Nitrogen, phosphorus, potassium and other fertilizers to be properly coordinated, not only to more fertilizers, but also pay attention to fertilization methods to improve fertilizer efficiency to ensure stable and high yield of agriculture. Nutrients required for the normal growth and development of crops consist of dozens of elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, silicon, iron, sulfur, boron, manganese, copper, zinc, , Of which carbon, hydrogen, oxygen demand is enormous. However, these three elements are never lacking because the two elements of hydrogen and oxygen combine to become water, and often drop into the soil in the form of rain and snow or by artificial means, and the root system can continuously absorb and meet the requirements of plants including proteins , The need for fats and carbohydrates for hydrogen and oxygen. Carbon