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Second, the use of antidotes after the occurrence of phytotoxicity can be remedied with certain antidotes. When paclobutrazol or other inhibitors or retardants cause harm, they can be sprayed with a solution of "900". 2,4,6-T has antagonistic effects with 2,4-D butyl ester. When 2,4-D butyl ester is used for phytotoxicity, it can be rescued by 2,4,6-T; 2,4,6-T can also reduce the phytotoxicity of oat husk against wheat. The wilting spirit can also relieve the phytotoxicity of oat spirits on wheat.
Third, spray growth regulators.
According to the needs of crops, foliar sprays such as foliar nutrition regulators and phytohormones such as Yelvbao, Duodekang, Kangpei, and cytokinin were used to promote the recovery of crops and reduce the damage caused by the injury.
Fourth, spray strong oxidants.
Potassium permanganate is a strong oxidant. It has oxidation and decomposition effects on various chemical pesticides. It can be sprayed with 3000 times potassium permanganate solution.
Fifth, irrigation and poisoning.
Due to overdosing of soil caused by phytotoxicity, large fields can be filled with water. On the one hand, it meets the water demand of crop roots, increases the water content of crop cells, and reduces the relative concentration of pesticides in crops. On the other hand, irrigation can reduce the concentration of pesticides in soil and reduce Pesticide poisoning crops.
Six, timely increase fertilizer material. After crop injury occurred, growth was hindered and the growth was weakened. The timely application of nitrogen, phosphorus, potash or decomposed organic fertilizer can promote the recovery of the affected plants. If the phytotoxicity is caused by acidic pesticides, lime or ash can be sprinkled in the ground. Heavier phytotoxicity can also be sprayed with 1% bleach solution. Alkali pesticides caused by phytotoxicity, available ammonium sulfate, superphosphate and other acidic fertilizers.
Regardless of the nature of the phytotoxicity, foliar spray 0.1-0.3% potassium dihydrogen phosphate solution, or 0.3% urea plus 0.2% potassium dihydrogen phosphate solution mixed spray, once every 5-7 days, even Spraying 2-3 times can significantly reduce the damage caused by phytotoxicity.
Seven, partial removal.
Damaged fruit, shoots, leaves, etc. may be removed from the fruits or fruit trees due to local application of the medicine or the medicine. If there is a phytotoxicity on the trunk and the main branch, it should be combined with a neutralizing agent or water. Detoxification.
Calcium is an important factor in inducing apple fruit disease According to a survey conducted by the Tianjin Golden Circle Farm Technology Office in recent years, the occurrence of certain apple diseases is related to calcium deficiency in the trees.
Calcium deficiency in apples can cause bitter pits, pox spot disease, brown scalding, black spot disease, punctal pitting, and fruit deterioration. The bitter pit, pox spot disease causes apple epidermis cells to be destroyed, the resistance to germs is reduced, and it is easy to cause the spread of anthrax and brown rot. The calcium-deficient apple has a shorter shelf life and is prone to cause diseases during storage. The calcium-deficient fruit has increased cell permeability. The flesh of the fruit is susceptible to molasses, and the internal dissolution of the flesh is oozing out. This provides nutrients for the breeding of pathogens, resulting in the occurrence of apple rotting.
In trees with severe calcium deficiency, plant protein synthesis capacity declines, affecting tree growth and fruit yield. Some varieties have severe physiological drop and pre-harvest fruit drop, often associated with calcium deficiency.
Apple calcium supplementation should be based on the principle of supplement. Specific practices: 0.3%-0.5% calcium nitrate is sprayed on the trees after flowering and young fruit, and 0.5% calcium chloride is sprayed during fruit expansion. Severe calcium deficiency orchards, organic fertilizer should be added, mixed with calcium magnesium phosphate fertilizer, adjust the pH of the soil solution or consider the fertilizer ratio, fertilizer type and the balance between the elements.
There are two peak periods for calcium absorption by apple trees in one year. The first time within 30 days after flowering, the fruit can accumulate 90% of total calcium; the second time is 30-40 days before harvest, which is absorbed during this period. Calcium can be stored in the tree, and it can be re-used in the spring for young shoots. If calcium supplements miss these two periods, the effect is very poor.
The calcium applied to the leaves rarely migrates to the fruit. Calcium supplements commonly used for foliar calcium supplements: so calcium should be seized during the young fruit period and direct calcium application
1, calcium nitrate: general spraying concentration of 0.4% -0.5%, after the flowering of apple trees, both calcium and promote growth.
2. Calcium chloride: The spraying concentration is 0.3%-0.5%. Spraying leaves is easy to burn under high temperature. Generally, it is applied in the later period of fruit, which can reduce the calcium deficiency disease during fruit storage period.
3, amino acid calcium: amino acid calcium itself is a high protein hydrolysate, is the best nutrition of plants. 30 days after flowering, spraying 1-2 times before 30 days of fruit picking, the best results.
4, humic acid calcium: humic acid, fulvic acid is a good calcium binding agent. It is composed of high active humic acid + high content of free calcium + growth-enhancing effect and multi-trace elements.
5, water-soluble high-performance calcium: Chinese Academy of Agricultural Sciences research results, can achieve high-effective calcium, the purpose of quick results.
Crop phytosanitary treatment
First, the neutralization agent is sprayed to neutralize the nature of the drug that causes the injury. In the event of copper sulphate poisoning, 0.5% quicklime can be sprayed to rescue. If it is harmed by lime sulfur, spray 400-500 times of rice vinegar on the basis of washing to reduce the damage. When dimethoate and other organophosphorus pesticides produce phytotoxicity, 200 times of borax can be sprayed 1-2 times.