Increasing the Number of Bunch/Berry Weight in Table Grape

In order to influence the production of higher table grape yields the farmer will need to control the number of grape bunches and grape berry weight.

Crop Nutrition and Bunch and Berry Weight in Table Grape

Phosphorus 

Phosphorus has a direct effect on table grape yield. Where phosphorus is naturally low in soils, fertilizer phosphate increases berry set and crop yield.

Potassium

Potassium is involved in transportation of photosynthetic products from leaf to different organs of crop, thus it determines berry growth and yield. It has been shown to increase general berry yield and bunch weight by between 24 to 44%.

Boron

Boron plays an important role in table grape fruit set. It is quickly taken up from the soil, but is relatively immobile in the plant, so foliar sprays should be applied just prior to and immediately after flowering to ensure correct pollination and a full table grape bunch number. Deficiencies of boron can seriously affect table grape production, by causing poor bunch number, with large and small berries on the bunch. Thus application of sufficient boron is essential to increase growth and yield.

Iron

Applications of iron (e.g. as chelates through soil application of Fertigation) can be used to increase early leaf production and vine productivity. Application of sufficient amount of iron resulted in higher growth and increase of grape berry weight. Keep in mind though that over-application can have a negative effect. A high iron content in the soils can also reduce manganese uptake, which ensures better berry development.

Zinc

Zinc has a positive effect on berry weight in store.

Related articles

Increasing Table Grape Yield

Increasing Table Grape Yield

High yield of table grape is obtained on the most freely drained soils where nutrients and water are sufficiently available. Table grape grows across a wide range of soils, from sands to clays, that can be of high or low fertility.
Influencing Table Grape Quality

Influencing Table Grape Quality

Table grape quality standards vary between countries. Many have been established as a result of local preference, taste and tradition. Maintaining high sugars and a juicy berry by manipulating the time of maturity is important for marketability.
Influencing Table Grape Health

Influencing Table Grape Health

Deficiency of any essential nutrient can hinder growth and development of a crop. Well-nourished crops are generally more tolerant of diseases compared with sub-optimally nourished crops.
Preventing Bunch Stem Necrosis in Table Grapes

Preventing Bunch Stem Necrosis in Table Grapes

Bunch stem necrosis is a disorder known under many different names. It can occur around flowering or at veraison, sometimes even later in the season.

See all table grape nutrition advice