The phenomenon of yellowing is a very common phenomenon in the process of crop planting. The phenomenon of yellowing is mostly caused by deficiency. In the planting of flowers and trees, the leaves are yellowed due to iron deficiency. The symptoms of iron deficiency first appear yellowing from the veins of the new leaves, and the veins are still green, and then the whole leaf color turns yellow or whitish. When large flowers and trees are deficient in iron, the light leaves turn yellow and grow slowly; in severe cases, the crowns are scorched or the whole plant is dead. How to remedy the iron deficiency yellowing of flowers and trees? If you use the self-contained iron fertilizer to rescue in time, you can receive obvious results.
How to remedy the iron deficiency yellowing of flowers and trees:
Usually, when the flower plants appear iron-deficient chlorotic yellowing, most of them use ferrous sulfate (green sputum), but its nature is unstable, easy to lose water and oxidize to become brown iron sulphate, especially in high temperature light or Ferrous sulfate is more unstable in the presence of alkaline materials. The water used to dissolve the ferrous sulfate loses its effectiveness if the pH is greater than 6.5. Or if the ferrous sulfate is poorly preserved and turns from blue-green to brown, it means that it has been oxidized to ferric sulphate. Even if it is applied, it cannot be absorbed and utilized by the plant. However, the self-adapted iron fertilizer can overcome the above phenomenon and can be planted after being applied. Timely absorption, remedial chlorosis and yellowing effect is significant. The preparation methods of two kinds of iron fertilizer are introduced below:
1. Earth-made iron fertilizer. When preparing, mix 1 part of pulverized ferrous sulfate with 5 parts of decomposed or semi-fermented organic fertilizer to form a composite iron fertilizer for soil. If the organic fertilizer contains less water, it needs to be moistened with water to make water content. It is about 50%. During the preparation, the ferrous sulfate is evenly sprinkled on the organic fertilizer, and stirred while being sprinkled to make it evenly mixed. When using, first dig the annular groove along the canopy, the groove width and the groove depth are about 50 cm each. The mixed organic fertilizer is evenly applied into the ditch, and the soil is covered with water. Large flowers and trees are fertilized by 4 to 5 kg per plant, and small flowers and trees are fertilized by 3 to 4 kg per plant. The fertilization time is suitable before the flowering of the flowers. It can also be carried out in the fall when combined with trees to apply base fertilizer. Do not apply during the growing season to avoid fat damage. More than 95% is applied in this way.
2, leaves cast iron fertilizer. When preparing, 0.25% ferrous sulfate, 0.05% citric acid, and 0.1% urea are selected for use. First, 50 grams of citric acid is added to 100 kilograms of water. After dissolution, 250 grams of ferrous sulfate is added and stirred thoroughly. After the ferrous sulfate is dissolved, 100 grams of urea is added to form a composite iron fertilizer for the foliage. The addition of citric acid can prevent the hydrolysis of ferrous sulfate, ensure that iron is in an effective state, and can be fully absorbed and utilized by plants. The addition of urea can promote the synthesis of chlorophyll, which is beneficial to the planting of flowers and trees. This self-made foliar sprayed iron fertilizer should be used in the growing period of flower and plant plants, and it is advisable to spray it before 11:00 am and after 3 pm. The big tree sprays about 15 kilograms per plant, and the small tree sprays about 10 kilograms per plant. After 10 days, it is sprayed once again. Generally, after two sprayings, the greening yellow leaves can be greened.
Note: When applying soil, it is not advisable to apply ammonium nitrogen fertilizer and elements with iron antagonistic effect at the same time. Because ammonium nitrogen fertilizers such as ammonium sulfate, ammonium hydrogencarbonate, and ammonium phosphate can destroy organic matter and iron complexes in water and soil, and oxidize ferrous iron into ferric iron that is not easily absorbed. Calcium, magnesium, manganese, copper and other elements have an antagonistic effect on iron and can reduce the effectiveness of iron. When applying self-made iron fertilizer, it is best to apply fertilizer containing these elements at the same time, while applying decomposed organic fertilizer, mixed application The effect is better, due to the decomposition products of organic matter, and the complexation of iron. Can improve the solubility and effectiveness of iron.
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