Remedial measures after Frost damage
1, timely artificial pollination If the late frost occurs earlier, the temperature drops below 0°C, the flowers that are opening or have opened are severely damaged by low temperature, and have lost the ability to pollinate, fertilize and set fruits. At this time, artificial pollination should be carried out on the unopened middle and late flowers after the frost to improve the fruit setting rate. If the late frost occurs late, the frost temperature is above 0°C, the style and ovary have not changed, and there is still the ability to pollinate and fertilize, then artificial pollination should be carried out in time after the frost.
Picture: Walnut
2. After artificial pollination, spraying 0.3% borax, 0.3% urea and 1.0% sucrose mixture to the tree crown to improve the fruit setting rate. Gibberellin spraying could promote monosexual seed setting and make up for yield loss when flower organs were not damaged.
3. After the flowering period of girdling or girdling, girdling on the trunk of big trees or weak trees with more fruits and girdling on the trunk of young trees or prosperous trees with less fruits can increase the fruit setting rate and reduce the adverse effects of late frost on yield.
4. Strengthen comprehensive management of tree body Strengthen comprehensive management of soil, fertilizer and water, especially timely increase fertilizer and topdressing outside roots, raise roots and strengthen trees, restore tree vigor as soon as possible, promote fruit development, increase single fruit weight and recover yield.
In addition, after the tree body suffers from late frost damage, the tree body is weak, the resistance is poor, and it is easy to cause pests and diseases. Therefore, attention should be paid to strengthen the comprehensive prevention and control of diseases and insect pests to minimize the yield and economic loss caused by diseases and insect pests; at the same time, attention should be paid to pruning in summer and fertilizing in autumn to improve the storage nutrition level of trees and lay a foundation for high yield in the next year.
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Basic characteristics of soil in High-yielding Orchard
Soil is the basis for fruit trees to survive. The soil of high-yield orchard generally has the following characteristics: deep soil layer, loose soil, living soil layer with a certain thickness (more than 60 cm), high content of soil organic matter, strong ability of water retention and fertilizer supply. Walnut belongs to deep-rooted tree.
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Measures to prevent Frost in flowering period of Walnut Fruit trees
The main results are as follows: 1. To select suitable garden plots and varieties, we should refer to the results of local agroclimatic regionalization, reasonably carry out industrial layout, and select favorable terrain which is not conducive to air-conditioning accumulation to avoid the harm of low temperature and frost. In general, cold air in valleys or depressions is easy to gather, often causing frost, so
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