锰参与植物的光合作用，是植物体内氮素的重要元素，调节植物酶活性，促进种

Manganese participates in the photosynthesis of plants, is an important element of nitrogen in plants, regulates plant enzyme activity, promotes seed germination and seedling growth, and enhances the cold and drought resistance of plants. The content of available manganese in the soil is directly related to the pH of the soil. <br>Among the 1711 soil samples in the study area, the effective manganese content ranged from 5.75 to 156.5 mg/kg, the standard deviation was 27.28 mg/kg, the coefficient of variation was 48.15%, and the average content was 54.4 mg/kg, which was 1.75 times higher than the level 1 standard. . Level 1 (>30mg/kg) of agricultural land in the study area accounts for 91.65%, and the soil has a rich content of manganese. <br>(1) Available manganese content in different soil types. The difference is small, among which the tidal soil is the highest with an average of 55.72mg/kg and the variation range is 5.75～156.5mg/kg; the brown soil is the lowest with an average of 49.86mg/kg

Manganese is involved in photosynthesis of plants, is an important element of nitrogen in plants, regulates plant enzyme activity, promotes seed germination and seedling growth, and enhances plant's ability to resist cold and drought. The effective manganese content of soil is directly related to the pH value of soil.<br>In 1711 samples of soil samples in the study area, the effective manganese content range was 5.75 to 156.5 mg/kg, the standard deviation was 27.28 mg/kg, the coefficient of variation was 48.15%, the average content was 54.4mg/kg, which was 1.75 times the standard level 1. The agricultural land at level 1 (30mg/kg) in the study area accounted for 91.65 percent, and the soil was rich in effective manganese content.<br>(1) The effective manganese content of different soil types. The difference is small, with the highest tide soil, with an average of 55.72mg/kg, with a variation of 5.75 to 156.5mg/kg, and the lowest brown soil, with an average of 49.86mg/kg

Manganese participates in plant photosynthesis, which is an important element of nitrogen in plants. It regulates plant enzyme activity, promotes seed germination and seedling growth, and enhances the cold resistance and drought resistance of plants. The content of soil available manganese is directly related to soil pH.<br>Among the 1711 soil samples in the study area, the range of available manganese content is 5.75 ~ 156.5mg/kg, the standard deviation is 27.28mg/kg, the coefficient of variation is 48.15%, the average content is 54.4mg/kg, which is 1.75 times of the first grade standard. In the study area, 91.65% of the farmland was at the first level (> 30mg / kg), and the content of soil available manganese was very rich.<br>(1) The content of available manganese in different soil types. The difference was small, among which the tidal soil was the highest, with an average of 55.72 mg / kg, with a range of 5.75-156.5 mg / kg; the brown soil was the lowest, with an average of 49.86 mg / kg<br>