Detailed Introduction to Six Well-Known Varieties of Red-Fleshed Navel Orange

Orange is a fruit that many people love to eat, and the red-fleshed navel orange is a variant of it, called blood orange, which is grown in many places in China. So next, the editor will introduce the six relatively well-known varieties of red-fleshed navel orange.

1. Six Relatively Well-Known Varieties of Red-Fleshed Navel Orange

The blood orange is named for its flesh that resembles the color of fresh blood. It essentially belongs to the navel orange category, and many flavorful varieties have been developed. The relatively well-known ones include the Italian Tarocco blood orange, and in China there are the Hongyu navel orange, rose blood orange, and others.

1. Tarocco

It was selected and bred from the nucellar seedling progeny of the Tarocco navel orange. The fruit generally matures in late January. As a late-maturing sweet orange, it is an important superior variety for promotion.

2. Rose Blood Orange

The rose blood orange is also called the rose-scented orange. The fruit is obovate or short oval, with obvious grooves at the stem end. The single fruit weighs 200-250 g, making it a larger strain among blood oranges. The peel is particularly smooth, and when ripe, the peel and flesh are blood-red. The fruit generally matures in late January.

3. Moro

The Moro navel orange is a recently added member of the navel orange family. Its color is the more vivid of the three, featuring deep purple flesh and a red-orange peel.

4. Sanguinello

The Sanguinello blood orange was discovered in Spain in 1929. Its skin has a reddish hue, it has few seeds, and the flesh is sweet and soft. The Sanguinello blood orange and the Moro blood orange share similar characteristics. It ripens in February, but if not harvested it can remain on the tree until April, and does not fall until the end of May. The orange peel is firm, bright yellow in color, with a slight reddish hue. The flesh is orange with many blood-colored streaks.

5. Hongyu Blood Orange

Also known as Ruby Blood Orange, Honghua Orange, and Hongbao Orange. It is mainly produced in countries along the Mediterranean coast, and is cultivated in China.

6. Hongwan Orange

Hongwan Orange is a variety introduced through the "948" project. This variety has pink to red flesh with uniform color. The outer peel has a special fragrance, and the aroma is pleasant when the orange is peeled. It has excellent quality and good marketability. The fruit is nearly round with a closed navel, and the average fruit weight is about 200-300 grams. It has a high fruit-setting rate, early production, and is extremely storage-tolerant, with a cold storage period of more than 4 months. As a new and special variety, it has great value for promotion.

2. Key Points for High-Yield Cultivation of Red-Fleshed Navel Orange

1. Deep Plowing and Soil Improvement

Dig fertilization pits 1-1.2 m long, 40-50 cm wide, and 40-50 cm deep along the outer edge of the fruit pit. Apply 20-30 kg of green manure and weeds, 10-15 kg of pig and cattle pen manure, 1-1.5 kg of phosphate fertilizer, and 0.5 kg of lime per tree. Mix the fertilizer with the topsoil, apply it into the pit, and cover with soil. Each year, carry out deep plowing and soil improvement 1-2 times in combination with deep application of organic fertilizer. Rotate the deep plowing locations successively, and complete deep plowing throughout the orchard in 3-4 years.

2. Planting Two Seasons of Green Manure

Use the open space between rows to plant two seasons of green manure. Carry out 3-4 times of shallow tillage and weeding in the tree disk each year, and do a good job of covering the tree disk during high-temperature and drought seasons. In rainy seasons, flatland orchards should do a good job of ditching and drainage.

3. Rational Fertilization

For 1-3 year old trees, the purpose of fertilization is to enhance the vegetative growth of the tree, promote the sprouting of robust branches, and enable rapid expansion to form a high-yielding tree shape. The fertilization principles are: frequent application, light application, small meals more often, mainly nitrogen fertilizer, with appropriate combination of phosphorus and potassium fertilizers. Apply 10-20% decomposed bran manure water (or biogas slurry) plus 0.1-0.3% urea or 0.1-0.3% compound fertilizer as a drench, once every 15-20 days. As the tree age increases, the amount used goes from less to more, and the concentration goes from dilute to concentrated. For each flush of shoots, implement "three fertilizers per flush", namely pre-bud fertilizer (10 days before budding), shoot-promoting fertilizer (when new shoots unfold leaves), and shoot-strengthening fertilizer (after leaves turn green). Strive to produce 3-4 flushes of robust shoots per year. When each flush of shoots turns green, combine with *pest and disease control and add foliar fertilizers such as Lüwang No. 1 at 1000 times or 0.2% potassium dihydrogen phosphate to promote shoot maturation.

4. Shaping

Summer orange should adopt a natural round-headed tree shape. Cut the top at a trunk height of 30-40 cm to set the trunk. After new shoots sprout, select and retain 3-4 robust, evenly distributed shoots on the trunk as main branches, with main branch opening angles of 40-45 degrees. Each main branch is configured with 2-3 secondary main branches to form a good, strong-load-bearing crown framework.

5. Pruning

Bud rubbing and shoot control: for young trees planted in the same year, after the first batch of shoots matures, during the period of releasing summer and autumn shoots, remove the scattered new shoots that sprout early, so as to release shoots uniformly, making new shoots emerge neatly and robustly and reducing damage from leafminers and aphids.

Friends who have eaten red-fleshed navel oranges probably know that its taste is quite good, and most people love to eat it. However, it has many varieties. I wonder which one you have tried? The six relatively well-known varieties shared above, which one do you prefer?

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