A Detailed Guide to the Key Techniques for Growing Muscat Hamburg Grapes

Muscat Hamburg grape is a fruit variety with a relatively long history, and it can be seen in most parts of our country. It generally ripens around the Mid-Autumn Festival each year, and the ripe berries are dark purple or black, tasting sweet with a slight hint of sourness. Eaten in summer, it is very refreshing and appetite-stimulating.

Muscat Hamburg Grape Growing Techniques

1. Seedling preparation. For one-year-old winter-stored seedlings, the thickness should be above 0.4 cm, with more than 5 lateral roots, stem thickness above 0.6 cm, and 3 to 5 plump buds. Soak in clean water for 12 to 24 hours 1 to 2 days before planting, so the seedling roots absorb enough water. For green leaf seedlings raised in nutrient pots in the same year, the seedling height should be above 15 cm, with three leaves and one heart.

2. Planting time. In Muscat Hamburg grape growing, winter-stored seedlings are best planted in late November or early April of the following year, and nutrient-pot seedlings from late April to early May.

3. Planting method:

One-year-old winter-stored seedlings. Dig holes in the planting trench, with the depth based on the depth of the seedlings in the nursery. When planting, spread the root system out in all directions and make it fit closely with the soil, then water promptly after planting.

Nutrient-pot green leaf seedlings. For large-area planting, a homemade hole punch can be used, made from thin iron plate into a round tube 6.5 cm at the top, 5.5 cm at the bottom opening, and 20 cm high, with a handle welded to the bottom facing down to remove soil and make holes. Remove the nutrient pot, place the soil-bearing seedling into the hole, fill soil around it and press firm, then water. For small-area planting, do the same as for winter-stored seedlings.

In Muscat Hamburg grape growing, in arid areas where water sources are difficult, it is advisable to plant deep and bury shallow, and build up soil year by year to increase root mass and improve drought resistance.

Fertilization Methods for Muscat Hamburg Grapes

1. Bud-promoting fertilizer. Apply in early to mid-April, before budding, with fully decomposed organic fertilizer, applying 15-20 kg of urea or 30-40 kg of diammonium phosphate per 667 sq m. If the base fertilizer is sufficient, this fertilization can be skipped.

2. Flower-promoting fertilizer. About 10 days before flowering, apply 15-20 kg of urea or 20-30 kg of diammonium phosphate per 667 sq m. Spray a 0.3-0.5% boric acid or borax solution once each at the early flowering stage and the full flowering stage.

3. Fruit-promoting fertilizer. During the berry enlargement stage, apply fully decomposed organic fertilizer or apply 15 kg of urea and 30-40 kg of diammonium phosphate.

4. Ripening-promoting fertilizer. Around the time the berries begin to color, apply foliar fertilizer, spraying a 0.2-0.3% potassium dihydrogen phosphate solution outside the roots, about once every 7 days, for a total of 3—4 sprays, or spray a multi-element compound fertilizer containing phosphorus, potassium, and calcium. For grapes to be stored, spray 0.5% amino acid calcium or calcium acetate to help keep them fresh during storage.

Small Pruning Tips for Muscat Hamburg Grapes

In the pruning steps for grapes, the main principle to master is “first look, second thin, third cut, fourth check.”

1. “Look” is the prerequisite, the investigation before pruning. First look at the climate, look at the soil, look at the variety, look at the tree shape, look at the tree vigor, and then look at the relationship with neighboring plants, to preliminarily determine the plant load, determine the pruning plan and the number of buds to retain.

2. “Thin” is, on the basis of looking, removing diseased and insect-damaged branches, thin and weak branches, dead branches, overly dense branches, and locally renewing weak main and side canes, thinning out useless root-crown sprout branches, and thinning to create the outline.

3. “Cut” is the processing, that is, according to the habits of the variety, under various different conditions, including tree age, trellis type, tree shape, growth vigor, different parts, and different branch qualities, determining the pruning and retention length of each branch.

4. “Check” is the ending, that is, after pruning is finished, checking again whether anything was missed, and checking for errors and filling omissions.

Water and Fertilizer Management for Muscat Hamburg Grapes

1. The budding water should be watered thoroughly, watering 7 to 10 days before budding.

2. The pre-flowering water should be watered thoroughly, watering 7 to 10 days before flowering, and no watering during the 10 to 15 days of flowering.

3. The fruit-swelling stage water should be watered thoroughly, watering once every 10 to 15 days.

4. During the coloring stage, water should be controlled, mainly with small amounts of water, because too much water easily cracks the fruit.

5. The winter irrigation water should be watered thoroughly, watering after leaf fall and before freezing.

6. Fertilization should mainly be concentrated fertilization after harvest, while also applying 4 key additional fertilizer applications, for a total of five fertilizer applications.

The most important thing in Muscat Hamburg grape growing is that the fertilizer and water techniques must be done well, and later-stage management is also crucial. Only by doing these tasks well can the grape quality be excellent when the fruit sets later; otherwise, berry drop and uneven grape size will occur.