Second, strictly follow the preparation procedure. When the medicine is dispensed, the copper sulfate is firstly opened in a non-metallic container with an appropriate amount of warm water, then filtered, 90% of the total water is added, and the residue is filtered out. Pour the filtered lime solution into the cement pool, then slowly pour the copper sulfate solution into the lime solution, stir while stirring, and stir for another 2-3 minutes. Never pour the lime solution into the copper sulfate solution. Otherwise, the prepared liquid will precipitate in the block, which is prone to phytotoxicity. In addition, the drug solution should be applied immediately after it is dispensed. It should not be placed for a long time.
Third, we must pay attention to the spraying of Bordeaux mixture as a protective fungicide, should be applied before the onset of fruit trees, 15-20 days before the fruit harvested to stop application, so as not to contaminate the fruit surface. Peach, plum, apricot and other fruit trees that are particularly sensitive to copper cannot be used in the growing season. It is not advisable to apply Bordeaux mixture within 1 month after the flower falls and when the fruit is nearing maturity, in order to prevent rust spots or coloration on the fruit surface. When a bactericide is sprayed in this period, carbendazim, thiophanate or the like can be administered.
Fourth, different fruit trees should use different ratios. Different types of fruit trees are different in sensitivity to Bordeaux mixture. Different ratios should be selected according to their sensitivity. For copper-sensitive fruit trees, lime type or multi-type can be used. For pear trees that are less sensitive to lime or copper, lime is equivalent. For lime-sensitive and copper-tolerant grapes, a half-size lime can be used.
5. Reasonable mixing of Bordeaux mixture can not be mixed with soap liquid, rosin mixture, stone sulphur mixture, mineral oil emulsion, and bacteriostatic. Bordeaux mixture should be used with organic phosphorus pesticides carefully and can be used with mixing. It takes 10 days for the orchard sprayed with the stone sulphur mixture to spray the Bordeaux mixture, and the orchard sprayed with the Bordeaux mixture takes 20-30 days to spray the sulphur mixture.
Sixth, pay attention to the weather changes Bordeaux liquid should not be sprayed when the dampness and dew are not dry, otherwise copper ions will penetrate into the plant to cause serious phytotoxicity, so when spraying Bordeaux mixture should be sunny, no dew. Spray in the rainy season, try to avoid the wind and rain, and at the same time, increase the amount of lime in the dispensing.
Huaxian Agricultural Technology Promotion Center Lu Shuguang
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1. Pre-treat the wall or the ground before paving, and determine the way of paving according to the paving pattern. If there are directional patterns, the product should be paved according to the direction of the figure in order to obtain the best decorative effect.
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3. After laying for 12 hours, tap the brick surface for inspection. If any empty drum sound is found, it should be re-paved.
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