Citrus fruit picking period, fertilization in particular should be against chlorine
2021-11-11 11:08:33
The phenomenon of chlorine harm caused by irrational application of chlorinated fertilizers and pesticides in citrus production should attract the attention of orange farmers. In particular, after harvesting or harvesting, some orange farmers use compound fertilizers containing high levels of chlorine. The content of chloride ions in the soil increased significantly, the absorption of water after the orange tree absorbed decreased, and the root tip died.
The toxicity of chloride ions to citrus can be divided into two types, acute and chronic poisoning.
The duration of acute poisoning is relatively short, manifested as the decoating of the old leaves, the loss of citrus fruit, and the loss of the orange orchard when severe. This type occurs mostly in the control of chlorine-containing pesticides of citrus anthrax pests with potassium chloride, and an orange orchard for foliar spraying. Chronic poisoning takes a long time. In the victim's citrus tree, it was found that the midrib of the leaves had brownish necrotic areas with narrower upper ends and narrower bases. The young shoots showed irregularly shaped intermittent brown spots with gray leaves and dark green veins. In winter, it is easy to fall leaves. After stopping the use of chlorine-containing potassium chloride and chlorine-containing pesticides, their symptoms can be alleviated.
So, how can we reduce the harm of chloride ions to citrus? The first is to add nitrogen fertilizer, with little or no potassium fertilizer. Generally, 50 kilograms of orange trees can be applied with about 0.3 kilograms of urea, and 40 to 50 kilograms of decomposed human waste water. When applying compound fertilizer, it is necessary to use varieties with high nitrogen content and low potassium chloride content. The current compound fertilizers are urea-sodium superphosphate-potassium chloride series compound fertilizers, some of which have ammonium chloride added. Therefore, they contain high amounts of chloride ions, which can easily poison the orange trees. The second is that potassium chloride should not be used for rhizosphere fertilization, and it should not be used for foliar fertilization. In the rhizosphere application, potassium nitrate, potassium sulfate, or potassium dihydrogen phosphate is the best choice. For foliar application, urea, superphosphate, potassium dihydrogen phosphate (or potassium nitrate) can be added to the tank after adding water, and the filtrate can be taken after 5 to 7 days, diluted with water and used for foliar spray. After spraying, the leaf color can be changed to green, the leaves are thickened, and the effect of strong fruit is good. After the autumn shoot is frozen, it is significantly reduced, the leaves are less, the flower quality and flower amount of the following year are obviously improved, and chlorine ions can be effectively prevented. Citrus poisoning.
The toxicity of chloride ions to citrus can be divided into two types, acute and chronic poisoning.
The duration of acute poisoning is relatively short, manifested as the decoating of the old leaves, the loss of citrus fruit, and the loss of the orange orchard when severe. This type occurs mostly in the control of chlorine-containing pesticides of citrus anthrax pests with potassium chloride, and an orange orchard for foliar spraying. Chronic poisoning takes a long time. In the victim's citrus tree, it was found that the midrib of the leaves had brownish necrotic areas with narrower upper ends and narrower bases. The young shoots showed irregularly shaped intermittent brown spots with gray leaves and dark green veins. In winter, it is easy to fall leaves. After stopping the use of chlorine-containing potassium chloride and chlorine-containing pesticides, their symptoms can be alleviated.
So, how can we reduce the harm of chloride ions to citrus? The first is to add nitrogen fertilizer, with little or no potassium fertilizer. Generally, 50 kilograms of orange trees can be applied with about 0.3 kilograms of urea, and 40 to 50 kilograms of decomposed human waste water. When applying compound fertilizer, it is necessary to use varieties with high nitrogen content and low potassium chloride content. The current compound fertilizers are urea-sodium superphosphate-potassium chloride series compound fertilizers, some of which have ammonium chloride added. Therefore, they contain high amounts of chloride ions, which can easily poison the orange trees. The second is that potassium chloride should not be used for rhizosphere fertilization, and it should not be used for foliar fertilization. In the rhizosphere application, potassium nitrate, potassium sulfate, or potassium dihydrogen phosphate is the best choice. For foliar application, urea, superphosphate, potassium dihydrogen phosphate (or potassium nitrate) can be added to the tank after adding water, and the filtrate can be taken after 5 to 7 days, diluted with water and used for foliar spray. After spraying, the leaf color can be changed to green, the leaves are thickened, and the effect of strong fruit is good. After the autumn shoot is frozen, it is significantly reduced, the leaves are less, the flower quality and flower amount of the following year are obviously improved, and chlorine ions can be effectively prevented. Citrus poisoning.
Disinfection Box,Sterilization Box,Autoclavable Instrument Box,Instrument Sterilization Box
GUANGDONG JIANGMEN RONGHAI MEDICAL TECHNOLOGY CO.,LTD , https://www.kimaomedical.com