Entering November, the temperature difference between day and night increases, the orange quickly enters the fruit ripening period, the color change period is required to properly maintain the soil drought, look at the situation of the tree situation appropriate and reasonable water control is conducive to the formation and accumulation of soluble solids and sugars of the fruit, thereby promoting the transformation of color, but these days of continuous rainfall, too much soil moisture will affect the sugar accumulation and acid reduction of the fruit, but there is no way to agriculture is to see the day to eat, but some man-made measures will affect the color of the fruit, we can do it as much as possible to avoid.
The accumulation of sugar mainly comes from the synthesis of leaf photosynthesis, light on the accumulation of sugar is the largest nutrient, sufficient light on the fruit sugar accumulation has a great effect, light helps to increase anthocyanins, it promotes the photosynthesis of the leaves, so that more sugar accumulates to the fruit, the synthesis of anthocyanins requires a large amount of sugar to form anthocyanins, the higher the sugar content, the more anthocyanin synthesis, the faster the orange color change, ventilation and light transmission, good light conditions The tree shape is more obvious than the yellowing of the tree with poor light conditions.
Some densely planted closed orchards will affect the light due to improper pruning, and the yellowing of the poor light conditions of the drooping branches and the bottom fruit is not obvious.
Use the hanging fruit rope to support the fruit of the drooping branch in time, the overlapping fruit branches are branched out, at least let the sun shine, and there is a reasonable and appropriate shape and pruning can ensure sufficient light conditions in the canopy, to ventilate the light as a requirement, improve the light conditions of the closed canopy, and the reasonable tree shape with good light conditions is very conducive to the color and sugar of the fruit.
Autumn shoots are not yet ripe, the nutrients consumed by young shoots are very much, the nutritional competition contradiction between the shoots and fruits is very large, and the competition between the two has a great impact on the color of oranges to increase sugar, because the color change sugar is to accumulate enough nutrients, so the autumn shoots are not ripe.
Now the progress of low temperature and old ripening will also become slower, to quickly promote the old ripening of autumn shoots, the nutrients concentrated to the fruit, while the autumn shoots can form functional leaves after ripening can produce carbohydrates and organic nutrients, feeding back to the fruit, conducive to the accumulation of color and sugar.
The above content is a personal opinion, for reference only, the orchard here is the Guinan area, please combine the actual situation of your own orchard.
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