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What are the dark brown spots on Phalaenopsis leaves?
One of the most distressing things for flower growers is suddenly finding dark brown spots on the leaves of their Phalaenopsis! What exactly is going on? And
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In which regions of our country are dark brown earth soils distributed, and what crops are suitable for planting there?
Dark brown earth is a zonal soil formed under a temperate humid monsoon climate and mixed coniferous-broadleaf forests, and is an independent soil type separated from brown forest soil after the founding of China. Total K content is 15.7-19.3, the profile configuration is O-AB-Bt-C, humus accumulates in the surface layer, and the entire profile shows a medium to slightly acidic reaction, with a base saturation of 60-80%. The clay and iron-manganese contents in the middle of the profile are both higher than those of the eluvial horizons above and below it. Dark brown earth is also known as dark brown forest soil, and was once called brown podzolic soil and gray-brown earth. It was not until 1960, after the first national soil survey, that it was formally established as dark brown forest soil, namely dark brown earth.
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How to prevent and control black heart rot in celery with dark brown diseased parts bearing small black spots
Dark brown rot with small black spots on diseased parts: prevention and control methods for celery black heart rot
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