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For potato planting, sufficient nitrogen fertilizer can not only promote the growth of potato stems and leaves, luxuriant branches and leaves, dark green leaf color, rapid plant growth and always maintain a large leaf area, but also accelerate the accumulation of organic matter and extend During the leaf function period, photosynthesis is vigorous, thereby increasing the net photosynthetic productivity. Nitrogen deficiency is manifested by short plants, slow growth, poor root development, weak stalks, few branches, early flowering and few flowers; leaves are yellow-green or gray-green, and the base leaves are gradually chlorotic and shed, and they expand to the top leaves. When the leaves are rolled up, they are cup-shaped. In the later stage of growth, the leaf margins of the basal leaflets are completely chlorosis and shrunken, sometimes in a fire-like shape. When excessive nitrogen fertilizer is applied, the plant grows long, the stems and leaves shade each other, the photosynthetic efficiency of the leaves is low, and the leaves at the bottom of the plant become yellow and fall off without light, which delays potato setting and reduces yield. Therefore, to control the amount of nitrogen fertilizer applied to potatoes, it cannot be too much or too little. 
Understanding the chlorophyll content in plants can predict plant growth and the demand for nitrogen fertilizer. The determination and analysis of chlorophyll in potato leaves by a chlorophyll meter can determine the profit and loss of potato crop nitrogen. Nitrogen is a constituent element of plant chlorophyll. The surplus and deficit of nitrogen affects the chlorophyll metabolism of plant leaves. When there is a lack of nitrogen, the chlorophyll concentration of crop leaves decreases and leaves color yellow. In the actual production process, it is necessary to use it to strengthen scientific and technological guidance, so as to realize the accurate management of potato nitrogen fertilizer. 
Chlorophyll meter helps to achieve accurate management of potato nitrogen fertilizer
We know that chlorophyll content is closely related to photosynthesis and affects plant growth. Chlorophyll measurement is often needed in the research of plant photosynthetic physiology, developmental physiology and resistance physiology. Similarly, the chlorophyll content is also an important indicator for guiding crop nitrogen fertilizer management. Therefore, it is necessary to use a chlorophyll meter to determine and analyze the chlorophyll of crops.