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Gypsum powder prevents rice physiological blight
In the cold paddy fields of Shanchong, a condition known as physiological rice blast disease often occurs, particularly in organic rice fields where the rice is not fully decomposed. This disease typically appears during the tillering stage of the rice plant. Affected plants show poor tillering, with leaves turning brown and developing irregular brown spots on the lower leaves. These symptoms are sometimes mistaken for those of leaf rice blight. When the roots are pulled out, they appear yellow-brown or even black, and the seedlings fail to grow properly. This phenomenon is commonly referred to as "early autumn" in local farming terms.
The occurrence of this disease is primarily attributed to three main factors. First, the decomposition of green manure can release harmful substances such as hydrogen sulfide. Second, some cold-sweeping fields that carry rust may contain toxic materials. Third, overly acidic soil, compaction, and excessive waterlogging can lead to poor aeration, worsening the condition of the rice plants.
To address this issue, farmers should adopt proper fertilization practices and manage irrigation effectively. For moderately affected areas, applying 75 to 100 kilograms of fire-fighting ash per acre can help. In more severe cases, 10 kilograms of gypsum powder per acre is recommended. After about 8 days, the plants usually begin to recover. Gypsum works by breaking down harmful substances in the soil, neutralizing acidity, improving soil structure, and enhancing aeration. As a result, the rice seedlings can develop new roots and resume normal growth. This approach not only helps in restoring the health of the plants but also supports long-term soil fertility and productivity.