First, continue to prevent disease and protect leaves
The temperature difference between day and night is getting bigger and the dew condensation phenomenon will appear. It means that downy mildew will continue to damage the leaves of grapes. Damage to the leaves of the plants will also affect the photosynthesis of the plants. The plants that have been working hard for more than half a year will need more organic nutrients from photosynthesis to safely survive the winter. Therefore, prevent disease and protect the leaves, can not relax.
Specific measures: If downy mildew is not seen and is serious enough to prevent it, spraying pyraclostrobin or azoxystrobin + mancozeb, if downy mildew has already occurred, bactericidal inhibition and promotion of leaf chlorophyll The syntheses were carried out concurrently with the injection of pentoylmorpholine or flumorphin + mancozeb + brassin or humic acid foliar fertilizer.
Second, the quality and quantity of basal fertilizer applied
The basal fertilizer used in the autumn is equivalent to the monthly sub-fertilizer. It is a necessary nutrient supplement for the grape that has worked hard for half a year. However, many people do not pay much attention to it, and they tend to be busy picking and selling grapes. They have no time as an excuse, or because the weather is not suitable for field operations, or they postpone until October or even November when the temperature is already low. , or simply do not apply fertilizer, to be applied again next spring. This is a wrong understanding. It is a little self-deceptive, and it is a must.
The meaning of fertilizing the grapes in autumn is not only the monthly fertilizer, but also the use of pre-winter light and temperature, green leaves, and the peak of the second activity of the root system to apply NPK, Ca, Fe, Zn, etc. to the grapes. Trace elements and organic matter, etc., are stored in grape plants through the photosynthesis of synthetic organic nutrients for sprouting and shoot growth in the spring of next year.
Specific measures: After the harvest of autumn grapes, the basal fertilizer can be used for one week after harvesting. Usually, the spur is applied, ie about 50 centimeters from the plant, or with a trencher or artificial, excavate a ditch with a depth of 40-50 cm, and fully decomposed Farmyard manure, nitrogen, phosphorus, potassium and calcium fertilizers are uniformly applied. The amount of applied fertilizer accounted for more than 50% of the total fertilization in the whole year. After the application, cover soil and pour water.
Third, antifreeze winter
The critical value of the low temperature tolerance of stems of most grape varieties is -17°C, and the root system is -5°C. Therefore, the stems must be buried for winter. The buried time is usually carried out in the local half of the month before the freezing season. However, in the early winter each year, the temperature changes are often very large, and sometimes a sudden snowstorm can cause fatal damage to the grapes that have not yet taken cold measures. Therefore, we must pay attention to the weather forecast at the beginning of winter and take early measures to prevent freezing damage.
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