Internal cause
The difference in species is fundamental. Some tree species have serious years and years, and late-ripening kernels with high fruit setting rate are particularly serious. In addition, nutrient and hormone incoordination are also important.
1. Nutritional competition. In the large years of fruitful results, nutrients are continuously transported to the fruit, so that the storage nutrients of the tree are reduced, resulting in the inability to form flower buds in the same year, so it is a small year after the new year; Accumulation increases, and most of them create good material conditions for flower bud differentiation, and the next year is a big year, so repeated, forming a vicious circle.
2, the impact of gibberellin. In the large years with many results, the number of seeds on the tree increased correspondingly, and the gibberellin in the embryo was synthesized in large quantities (according to different plant research, the gibberellin secreted in the seed was 15 to 500 times higher than the new shoot) because of its energy. Inducing the production of α (alpha) to amylase, hydrolyzing starch and promoting the growth of new shoots inhibit flower bud formation, making the next year into a small year.
Bad natural conditions
Poor natural conditions such as cold, night frost, and hail hail often lead to the cause of the years. For example, the normal result tree causes a large amount of flower or young fruit to be damaged due to the late frost damage, which is beneficial to the accumulation of nutrients in the tree. Forming, making the next year a big year, natural disasters are large-scale, sometimes involving a county, a province or a few provinces, so the years of age often show its consistency in one area. In addition, due to differences in pests, fertilizers, and varieties, there are small-year plants in the new year, and there are large-year plants in small years.
Unreasonable cultivation techniques
If the prevention and control of pests and diseases is not timely in a certain year,
A lot of leaves from July to August, not very good in the year
The flower buds are formed, causing the leap year to be a small year. In the year of a large number of flowering results, neither fruit thinning nor top dressing in early spring and its critical time is made, so that the tree is undernourished and the flower buds are poorly differentiated, causing or aggravating the occurrence of large and small years.
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