Glyphosate is a system of broad-spectrum herbicides that is highly damaging to perennial deep-rooted grassland. It can directly kill the roots of weeds, as long as it is used in glyphosate orchards. Some small root vegetables will grow and there will be few weeds, so many growers like to use glyphosate.
However, although glyphosate is easy to use, it also has its drawbacks. It can cause phytotoxicity and affect the growth and results of citrus. For citrus, how big is glyphosate damage? Let's take a look at it.
First, the symptoms of glyphosate
When using glyphosate, the most likely cause is accidental spray or chemical liquid drift, they are very easy to cause phytotoxicity, glyphosate phytotoxicity is divided into two types, namely direct phytotoxicity, indirect phytotoxicity and recessive Drug damage.
1. Direct phytotoxicity
The lighter makes the citrus wilted, and the leaves are dark blue and purple. In severe cases, it turns yellow, turns red, and finally turns brown and dies.
2. Indirect phytotoxicity
The growth of new leaf sprouts was inhibited, the growth of elongation was slow, the greening was affected, and some of the leaves were narrow and long.
3, invisible phytotoxicity
Glyphosate has a special effect on plants of the grass family, but has a poor effect on broad-leaved plants. If it is a general control weed concentration, the damage to citrus is relatively light, but if it is accumulated over time, it will inhibit the growth of citrus roots.
The degradation product of glyphosate is easy to combine with iron, zinc and the like in the soil. The effectiveness of iron and zinc is thus reduced, and citrus may have symptoms such as leaflets, mosaics, and branches due to iron deficiency and zinc deficiency.
4, citrus roots floating
Although the orchard sprays the herbicide very carefully, the leaf of the fruit tree can be directly absorbed and transmitted to the root system due to improper operation or a large amount of drug mist drifting with the wind when spraying.
If there is a sudden heavy rain within a few hours after spraying glyphosate, the rainwater is directly poured into the soil around the roots with the liquid medicine, so that the roots of the fruit trees are directly absorbed.
There are also some orchard soil turbulence and unreasonable fertilization measures, which will make the citrus roots shallower, and even some roots will be exposed on the soil surface. When the herbicide is used, if the liquid is sprayed to the root, the root of the fruit tree will be damaged. We all know that the root system is the main cause of citrus physiological yellowing. After citrus yellowing, its photosynthesis is reduced, the tree potential will weaken and decline, and the disease resistance will be weakened, resulting in low citrus yield and fruit quality. Poor and other issues, so Xiao Bian believes that the biggest hidden danger of using glyphosate is here.
Second, the prevention and remediation of phytotoxicity
1. Master the correct use of technology or stop using it
For orchards that have developed glyphosate phytotoxicity, they should be stopped immediately and replaced by manual weeding. However, if the manpower of the orchard is insufficient, then the herbicide must be used. When using the herbicide, we must also master the spraying technology correctly. First, the protective cover should be placed on the sprayer nozzle, and then the directional spray should be used to prevent it. The liquid medicine drifts.
Since the contact herbicide paraquat can no longer be used, it can be replaced with glufosinate which is less harmful to citrus. Although glufosinate is also systemic and conductive, it is not strong and relatively safe.
2. Remedial measures after phytotoxicity
If the phytotoxicity is serious, first spray the wood ash, you can also spray the acidity in the water and the herbicide, spray 0.04ppm brassinolide on the canopy, add 6ppm sodium nitrophenolate solution, and the brassinolide can increase the plant's Anti-reverse ability, sodium nitrophenolate can promote the protoplast flow of plant cells and reduce the toxic effect.
3. Strengthen fruit nutrition management to reduce phytotoxicity
When the citrus is damaged by glyphosate, it has caused great damage to the roots of the fruit trees, which will reduce the absorption capacity of the roots. In this case, the fruit trees are difficult to absorb the fertilizers and minerals of the soil, so the key points are Starting from the foliar topdressing and improving the root system.
Foliar topdressing: Ensure the nutrition of the tree by means of foliar topdressing. It can be applied, high-purity potassium dihydrogen phosphate, etc., and the leaves are uniformly sprayed after being diluted by 800 to 1000 times.
Improve root system: The tip of citrus is connected to the root system. Only healthy roots can ensure the tree potential and reduce the hidden phytotoxicity of herbicides. Water-soluble fertilizer containing humic acid and alginic acid can be used, and the application is carried out after 200 to 300 times of watering, once every 10 days, and dripping 2 to 3 times.
4, orchard planting grass to inhibit weed growth
Orchard planting grass can control the growth of other weeds, prevent soil erosion in orchard, regulate soil moisture and temperature, increase soil organic matter content in orchard, and create a good ecological environment for fruit trees. Therefore, replacing the orchard with herbicides through the method of planting grass in the orchard can not only eliminate the drawbacks of herbicides caused by fruit trees, but also bring good ecological and economic benefits to the orchard.
The above is about the introduction of glyphosate in the orchard. As can be seen from the content, its drawbacks are still many. Therefore, before using the medicine, the farmers must make the correct method of medication, so as to avoid phytotoxicity.
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