Seasonal Trends of Calcium, Magnesium, and Potassium Fractions in Apple Leaf and Fruit Tissues1

Himelrick, David G.; Walker, Candace E.

doi:10.21273/jashs.107.6.1078

Cited by 13 publications

(1 citation statement)

References 10 publications

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“…All the minerals present in the apple peel and pulp affect physiological functions in plant metabolism, with some elements present in significant amounts while others play a minor role. As mentioned earlier, potassium is most abundant in fruit tissues (peel, pulp), and this organ is a strong sink for K, while nitrogen, as a building block, links the uptake of all other elements in fruit tissues [131][132][133][134]. It is confirmed that the apple peel has a slightly higher to several times higher content of many bioactive compounds compared to the fruit pulp.…”

Section: Apple Fruit Mineral Content and Its Qualitymentioning

confidence: 80%

Apple Growing in Norway—Ecologic Factors, Current Fertilization Practices and Fruit Quality: A Case Study

Ličina,

Krogstad,

Fotirić Akšić

et al. 2024

Horticulturae

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This paper presents some features of apple production in Norway, the northernmost apple-growing country in the world. Acceptable growing conditions prevail along the fjords in western Norway and around the lakes in eastern Norway at 60° north. These specific mesic climate conditions are associated with very long summer days (18 h daylight mid-summer) and short winter days (6 h daylight), with frost rarely occurring in the spring along the fjord areas. The present apple-growing technique in Norway is similar to that of other developed apple-growing countries, taking into account that all local growing phases involve a considerable delay in progress (1.5–2 months). Therefore, high-density planting systems based on the use of dwarf rootstocks (mainly M.9) with imported early maturing international apple cultivars are used in most orchards. The most common soil type has high organic matter content (2–18%), which persists due to the cool climate and low mineralization, and a clay content of <15%, which results from the formation of the soil from bedrock. The increase in average temperatures caused by current climatic changes leads to a complex combination of different physiological effects on apples, which can have positive or negative effects on the phenology of the trees. The main advantage of Norwegian apple production is that the quality and aroma of the fruit meet the current demands of the local market.

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Section: Apple Fruit Mineral Content and Its Qualitymentioning

confidence: 80%

Apple Growing in Norway—Ecologic Factors, Current Fertilization Practices and Fruit Quality: A Case Study

Ličina,

Krogstad,

Fotirić Akšić

et al. 2024

Horticulturae

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Magnesium deficiency of kiwifruit (Actinidia deliciosa)

Clark¹,

Smith²

1987

Plant Soil

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Magnesium deficiency was associated with large yield reductions in a five-year-old commercial kiwifruit (Actinidia deliciosa) orchard. The effect on yield resulted primarily from a reduction in fruit numbers, there being no difference in mean fruit weight between fruit harvested from affected and unaffected vines. Magnesium deficiency had no deleterious effect on postharvest storage characteristics of fruit stored at 0.5 1 ~ for 18 weeks; fruit from deficient vines were firmer but had slightly lower soluble solids than fruit from control vines.Although deficiency symptoms were first observed on the basal leaves of the non-fruiting shoots mid season, indications of the impending deficiency could be established very early in the season using foliar analysis. Magnesium concentrations in youngest fully expanded leaves (YFEL) on the affected vines were less than 2.0 g kg ~ DM four weeks after budbreak and remained below this value for the rest of the season; concentrations in YFEL on unaffected vines did not decrease below this value and gradually increased after fruitset to 4.5gkg ~DM at harvest. To avert potential production losses, it is suggested that soluble magnesium fertilizers (containing at least 200 kg ha 1 Mg) should be broadcast early in the season if foliar magnesium concentrations less than 2.0 g kg-~ DM are measured four-six weeks after budbreak.

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