Nutrition Management of nitrogen and Iron deficient Lilium

The mesophyll tissue between the veins of young leaves is yellowish green, especially for fast-growing plants. The greater the amount of iron deficiency in plants, the more yellow the leaves become. Iron deficiency is the most common cause in calcium-rich soils (high pH), muddy soils and soils with too much water. Iron deficiency can also occur if the soil temperature is too low. Iron deficiency is caused by the lack of absorbable iron in plants. If it turns yellow only slightly, it can return to normal during the harvest period. Lily populations and varieties sensitive to iron deficiency include far eastern hybrids and musk lily hybrids. The control method ensures that the soil drainage is good and the pH value is low. Good root system will greatly reduce the occurrence of iron deficiency. According to the sensitivity of crops to iron deficiency, chelated iron was applied in soils with pH higher than 6.5 before planting, and applied for the second time after planting according to the color of crops. If the color of the plant is still not satisfactory, it can be applied again in about two weeks. The amount of iron chelate applied depends on the pH value of the soil and the time of application. Excessive application will cause black spots on the leaves. The dosage is 2 to 3 g / m 2 (completely applied to the soil) before planting. The maximum dose after planting was 2 g / m 2. Chelated iron can be applied through an irrigation system or mixed with dry sand. In order to prevent the leaves from withering and scorching, chelate iron can be applied to wet crops in the evening when the weather is dark. After application, it must be washed thoroughly. When applying chelate iron to a new cultivated variety, an application experiment should be made first. The expression of nitrogen deficiency will cause the color of plant leaves to become lighter. When the soil nitrogen content is low, the plant stems are light, the flower buds are few, and the leaves turn yellow quickly during vase. It is best to apply sufficient nitrogen fertilizer according to the results of soil analysis. If nitrogen deficiency is diagnosed in cultivation, quick-acting nitrogen fertilizer should be applied. Be careful that the leaves are scorched when fertilizing, and make sure the crops are washed thoroughly after application.