葉っぱ黄色い人、犯人はpHかも！柑橘の土を測ったら衝撃｜Soil pH Check

📄 Description (Japanese) Chapters 00:00 Opening 00:10 Measuring Soil with a Simple pH Meter 00:34 Checking the pH of the Lemon Pot 01:39 Paying Attention to pH with High-Acid Citrus Fruits 02:09 Adjusting pH with Dolomite Lime 02:21 Leaf Color Fades When pH Drops 02:42 Yellow Leaves are a Sign of pH Abnormality 04:26 Guidelines for Suitable pH for Citrus Fruits 04:44 Precautions Regarding Dolomite Lime and Fertilizer 05:41 Leave at Least One Month Between Fertilizing and Using a Fertilizer 06:26 Potted Plants are Prone to Lowering pH 07:23 Measuring the pH of Miyagawa Wase 07:56 Also Checking Sudachi and Kabosu 08:46 Measuring the pH of Lime 09:21 Guidelines for the Amount of Dolomite Lime 10:38 Checking the pH of Yuzu 11:55 Indicating nutrient deficiency by the color of the grass 13:03 Measuring the pH of agricultural water 15:27 Why you should also consider the pH of the water 16:09 Potential impact on vegetables and flowers 17:24 Countermeasures against acidity and alkalinity 18:03 Summary This time, we will investigate the cause of citrus trees whose leaves have started to turn yellow in June by measuring the pH of the soil. High-acid citrus fruits such as lemons, limes, yuzu, sudachi, and kabosu have tended to experience a drop in pH in their pots from June to July in recent years. If the pH drops too low, the citrus tree will not be able to properly absorb fertilizer, even if it is present in the soil. In other words, the leaves may turn yellow even if you are fertilizing them. This time, when we actually measured the pH with a simple pH meter, we found that some pots had a pH of around 5 for lemons, around 4 for Miyagawa Wase, and around 5 for kabosu and limes. This is a considerably acidic state. The ideal pH for citrus trees to absorb fertilizer is around 5.5 to 6.5. A pH close to 6.5 is particularly good for efficient nutrient absorption. When leaves start to turn yellow, you might be tempted to immediately add more fertilizer, thinking it's a nutrient deficiency. However, if the soil's pH is unbalanced, the added fertilizer may not be absorbed effectively. First, it's crucial to check the soil's pH. If it's acidic, adjust the pH with dolomitic lime. However, simply adding a lot of dolomitic lime isn't the answer. It's important to gradually bring the pH closer to neutral, rather than trying to restore it all at once. Also, avoid using dolomitic lime and fertilizer simultaneously. Adding dolomitic lime and fertilizer close together can cause the components to react and deactivate, reducing the effectiveness of the fertilizer. Whether adding dolomitic lime after fertilizing or after fertilizing, it's recommended to wait at least a month between applications. Potted plants, in particular, are more susceptible to changes in pH due to the smaller amount of soil, which is affected by fertilizer and water. Potted plants require more frequent checks than those planted in the ground. In the video, we actually measure the pH of various citrus plants in pots, including lemons, shikwasa, Miyagawa Wase, sudachi, kabosu, limes, and yuzu. We observed a tendency for the pH of highly acidic citrus varieties to drop more easily. Furthermore, this time we measured the pH of the water as well as the soil. The pH of agricultural water may be low, and if the water itself is unsuitable for the plants, it can affect the growth of vegetables and flowers. If tomatoes and cucumbers aren't growing well, eggplant leaves are turning yellow, or flowers and vegetables are unhealthy, In such cases, checking the pH of the water and soil, in addition to fertilizer, might reveal the cause. While water is often thought to be neutral at around pH 7, this can vary depending on the region and time of year. If the water is leaning towards acidity, adjust it with dolomitic lime. If the soil is too alkaline, adding fertilizer can help return it to an acidic state. If your citrus leaves started turning yellow in June, if your potted citrus plant is not doing well, or if the leaves aren't recovering their color despite fertilizing, please check the pH of your soil and water. 📄 Description（English） In this video, I check the soil pH of citrus plants whose leaves are starting to turn yellow in June. Acidic citrus varieties such as lemons, limes, yuzu, sudachi, and kabosu tend to show lower soil pH in pots from June to July. When the pH becomes too low, citrus trees may not be able to absorb properly nutrients, even if fertilizer is still present in the soil. This means the leaves can turn yellow even after fertilizing. Using a simple pH meter, I check several potted citrus plants. Some lemon pots show around pH 5, while other citrus plants such as kabosu, lime, and even Miyagawa wase mandarin show very low readings. For citrus, a rough suitable pH range is around 5.5 to 6.5. When the pH is closer to this range, the roots can absorb nutrients more easily. If the leaves start turning yellow, it is easy to t...