The cause of rot
Due to the excessive irrigation in the storage ditch, the stumps are low in storage location, with high soil moisture content and poor ventilation, resulting in rot.
Frostbite nursery stocks were stored or stored too late, and were exposed to the cold outside for a long time. The storage ditch was too shallow and the earth was thin, or was checked in the cold winter season, and the root system of the seedlings was frozen.
Premature burns, thick overburden, high temperature and humidity in the ditch, poor ventilation, resulting in excessive temperature in the storage ditch, resulting in burning roots and rot.
Prevention of rot
Before digging the storage ditch and seedlings, select lee, cool, high dryness and high groundwater level, dig trenches in the north and south direction, and each width and depth shall be 80 centimeters and the length shall be determined. If the ditch is too dry, it should be thoroughly moistened with water and stored in a single layer.
Timely storage of grape seedlings can be carried out after the dormancy period, and 50 or 100 seedlings will be bundled with the nursery stock purchased or purchased, with the variety label attached and tied with plastic ropes. Before storage, first lay a layer of 10 cm thick wet river sand at the bottom of the ditch. The humidity is suitable for handing and touching. Put the bundles of seedlings vertically down into a bundle of bundles in the bottom of the trench, but do not squeeze too tightly. At the same time, place a straw handle every 2 meters to adjust the temperature of the trough.
The rot in seedlings of staged soil cover is mostly heat injury. The temperature should be lowered in stages to cover the soil. The time and thickness can often be drawn out to determine the temperature according to the temperature in the ditch. The temperature in the ditch is preferably 0°C to 2°C, and no more than 5°C. After the soil is completely frozen, the soil is covered once at a time and the thickness is 15 to 20 cm, which is higher than the ground to prevent silting of rain and snow.
Timely temperature rise in the next year after unearthing, we must always observe the ditch temperature, such as stable for more than 5 °C for several days, the seedlings out of the ditch, placed in a cool place, cultivated wet sand, to prevent dry, and strive to plant early.
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