There are some ways to grow citrus by coloring and promoting flower.

If the citrus color is beautiful and the fruit is high, the key is to apply phosphorus and potassium fertilizer early, because phosphorus and potassium are beneficial to the accumulation of sugar and the formation of protein, and increase the chromaticity of the fruit. Do not spray quick-acting nitrogen fertilizer, there is a lot of nitrogen, the tree is prosperous, and most of the photosynthates are converted into nitrogen-containing organic compounds to form shoots and consumed. The fruit is characterized by coarse fruit, green skin, poor color conversion, low fruit juice content, less soluble sugar, poor quality and so on. Foliar spraying to supplement phosphorus, manganese, zinc and sulfur (such as green Fenwei fruit beautiful) can make citrus early ripening, sanding, obvious yield increase, uniform fruit size and luster, and has a lasting effect against frost and cold. Spray once when the fruit begins to change color, at intervals of 10-15 days, and spray again.

The quality of citrus flower bud differentiation is the key to determine the number of flowers, flower quality and fruit setting rate next year, so promoting flower is one of the important measures to ensure high yield next year. The top priority is the following three measures:

Ring cutting to promote flowers

It is generally carried out from mid-late November to early December. Cutting 1-2 circles on the trunk or branch with a knife can promote the nutrient accumulation of the upper branch and increase the sap concentration. However, it should be noted that the ring cutting should not be overweight, and the depth of the xylem should not hurt the wood. If the ring is cut twice, the spacing should be more than 3 cm. If you don't pick the skin, you don't have to cut it with a saw ring, otherwise it won't heal. Ring cutting is mostly used for young and strong trees, old trees, weak trees are generally not suitable for ring cutting to promote flowers, because the old and weak itself tends to reproductive growth, easy to become flowers, if cut, the wound is difficult to heal. Pay attention to the weather, dry, windy or rainy days should not be cut. Foliar fertilizer with high phosphorus and potassium should be sprayed 1-2 times before and after ring cutting to provide enough nutrients to meet the needs of flower bud differentiation. It is best to choose long-term foliar fertilizer with slow release (such as Lvfenwei Huabao), which lasts for 15-20 days.

Rational application of winter fertilizer

Fertilizers are mainly long-acting organic fertilizer, peanut bran, chicken shit, etc., combined with quick-acting chemical fertilizer. This fertilization should account for about 30% of the total amount of fertilizer applied in a year.

Pay attention to water control

Moderate drought in winter is the external condition of antagonistic flower bud differentiation of citrus, which can inhibit growth and increase sap concentration. Generally, water control begins in the middle and last ten days of November, digging and exposing roots or combined with deep ploughing to improve soil, partial root cutting to control growth and water absorption. When controlling water, we should pay attention to "light leaf color, leaf micro-roll" is appropriate. If the drought is too much, spray a thin water mist on the leaves to avoid a large number of fallen leaves.