根据作物三个生育阶段所需养分情况,决定施肥最好时间,是提高施肥增产效应正确途径之一。第一阶段:一般在作物种植后40—50天的需施磷、锌、铁、锰、铜、镁肥。上述养料施入土壤后,因移动比较小常被贮存在施肥点附近,不易随土壤水分流移到作物根处,当根发育后,方可与这些元素接触。而在头50天移动性比较大的养分氮和钾很快被作物幼根所吸附,在此阶段没有更多的条 According to the three fertility stages of crop nutrients required to determine the best time for fertilization is to improve fertilization and yield effect one of the correct ways. The first stage: usually 40-50 days after crop planting need phosphorus, zinc, iron, manganese, copper and magnesium fertilizer. After the above nutrients are applied to the soil, they are often stored in the vicinity of the fertilization point due to their relatively small amount of movement, and are not easily moved to the roots of crops with soil moisture. When the root is developed, they can be brought into contact with these elements. In the first 50 days, the nutrients N and K with high mobility were quickly absorbed by crop roots, and there were no more bands at this stage