When tomatoes transition from green to white, it's important not to remove the lower or upper leaves. The dark green leaves that are free from pests or spots should remain on the plant, as they play a crucial role in photosynthesis and contribute significantly to the overall nutrient supply needed for high yield. The older, yellowing leaves at the bottom of the plant that have naturally aged can be removed, but not too early. Studies have shown that these leaves do not consume much of the plant’s nutrients and removing them too soon may hinder growth. However, if the middle or lower leaves show yellowing due to pests or physiological issues, they should be pruned promptly to prevent further damage. As the plant matures, it's best to remove only 2–3 leaves at a time during each pruning session. Removing too many leaves at once can cause the remaining leaves to curl, which may affect the plant’s health. It's recommended to wait 7–10 days between each pruning session to allow the plant to recover and adjust. Leaf removal should be done in the morning, around 10:00 a.m., on a sunny day. This timing helps reduce the risk of infection at the pruning site, as the plant is more active and better able to heal. Always use clean, sharp tools when pruning to avoid spreading diseases and ensure smooth healing of the cuts. By following these guidelines, you can maintain a healthy tomato plant, promote better fruit development, and increase your overall harvest. Proper leaf management is an essential part of successful tomato cultivation.

Color Doppler Ultrasound Scanner

"Color Doppler Ultrasound Scanner" is a high-definition black-and-white B-ultrasound plus color Doppler. Its main advantages are: it can quickly and intuitively display the two-dimensional plane distribution of blood flow; it can display the running direction of blood flow; it is beneficial to distinguish between arteries and veins; it is beneficial to identify vascular disease and non-vascular disease; it is beneficial to understand the nature of blood flow ; It is convenient to understand the phase and speed of blood flow; it can reliably detect shunt and regurgitation; it can quantitatively analyze the origin, width, length and area of blood flow. These ultrasound manifestations and parameters play a very important auxiliary role in the diagnosis of clinical diseases.

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