Physical prevention control method
Orchard fertilizer management. After the fruit tree sprouts, the tree body consumes a lot of nutrients, and the anti-freezing ability is rapidly weakened. Therefore, the fruit tree base fertilizer and foliar spray fertilizer should be done in advance to supplement the nutrient of the tree body. Basal fertilizer was applied in the autumn, organic fertilizer was reapplied, and N, P and K fertilizers were applied rationally, and trace elements were supplemented in a timely manner. Trace elements are preferably chelated fertilisers containing high boron and high zinc. Due to the large heat capacity and thermal conductivity of water, irrigation water can increase the soil moisture content, which has a certain regulation effect on the temperature change near the surface, and can reduce the freezing damage.
Smoke and frost protection. The use of weeds, wheat straw, etc. to release large amounts of smoke, reduce the distribution of soil heat, but also absorb moisture and increase the temperature. It is advisable to produce smoke with dark fire and heavy smoke, with more than 6 piles per acre. Timely listening to the weather forecast, before the onset of low-temperature frost, organize fruit farmers to focus on contiguous, multi-point, long-term smoke, with good results.
Flowering bee, artificial pollination. It is conditional to lease bees at the flowering period and to put in orchards according to the proportion of 10 boxes of bees in 10 acres of orchards. In order to prevent poor pollination due to abnormal weather, artificial pollination is also required. Pollination is the best when pollen mixed pollen is used, and the time should be on the day when the flowers bloom.
Drug Control
Before the budding of the fruit trees to flowering, spray 0.3%-0.4% potassium dihydrogen phosphate solution + 0.3%-0.5% urea solution 1 or 2 times to enhance the cold resistance of the fruit trees during flowering.
On the day before the onset of frost damage, 1400-fold solution of Luyuan fruit trees or 1200-time solution of Tianda 2116 and borax solution of 0.2% of fruit trees plus 0.2% of borax were applied. After frost damage occurs, spray Tianda 2116 fruit tree special 800 times liquid or Lvyuan fruit tree applicable 1000 times liquid + 0.5% sucrose water + 0.2% - 0.3% borax, spray it once every 7 days, and spray it twice to reduce freezing damage. Improve the effect of fruit setting rate.
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