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Eivind Vangdal, Sigrid Flatland and Ingvild Mehl Bioforsk Vest Ullensvang, Norway

The Effect of Foliar Fertilization with Potassium and Magnesium on Fruit Quality in Plums ( Prunus domestica L.). Eivind Vangdal, Sigrid Flatland and Ingvild Mehl Bioforsk Vest Ullensvang, Norway. This presentation includes:. Why use foliar fertilization

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Eivind Vangdal, Sigrid Flatland and Ingvild Mehl Bioforsk Vest Ullensvang, Norway

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  1. The Effect of Foliar Fertilization with Potassium and Magnesium on Fruit Quality in Plums (Prunus domestica L.) Eivind Vangdal, Sigrid Flatland and Ingvild Mehl Bioforsk Vest Ullensvang, Norway ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  2. This presentation includes: • Why use foliar fertilization • Present status of major nutrients in plum and present recommendations for foliar fertilization in plums in Norway • Results from field experiments • Conclusions ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  3. Why use foliar fertilization? • Strong focus on fruit quality • Good foliar fertilizers are available • Are fruit trees in high density orchards able to get the nutritients needed through their roots for optimum fruit quality? ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  4. Standard fertilization in plums in Norway: • N-P-K mineral fertilizer on the soil in the spring Contains some calcium and magnesium and trace elements like Manganese, Boron, Zink etc. ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  5. Leaf analysis of plums: *) Per cent of DM; **)ppm of DM

  6. Standard fertilization in plums in Norway: • N-P-K mineral fertilizer (6-5-20 or 11-5-18) on the soil in the spring • Foliar fertilization: • Calcium (every second week from two weeks after petal fall until 2 weeks prior to estimated harvest date) • Boron (once after harvest, once two weeks prior to flowering • Nirogen (urea after harvest) ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  7. Field experiment with foliar fertilization with Mg and K A: Foliar fertilization programme with N, P, K, Ca, Mg, Cu, S, B, Mn, Zn (Reduced N-P-K on the ground) ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  8. Foliar fertilization programme:

  9. Field experiment with foliar fertilization with Mg and K • A: Foliar fertilization programme with N, P, K, Ca, Mg etc. (in additon to N-P-K on the ground) • B: As A + 2 x 5 kg MgSO4 (week 24 and 27) • C: As A + 2 x 3 kg MKP (week 29 and 32) • D: As A + both Mg and K as in C and D • Cultivars: Avalon, Excalibur and Reeves ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  10. Results: yield, fruit size and colour

  11. Results: internal quality factors

  12. Results: leaf analysis

  13. Results: fruit analysis

  14. Results: yield, fruit size and colour

  15. Results: internal quality factors

  16. Results: fruit analysis

  17. Concluding remarks: • The results shown in this presentations do not indicate strong effects of foliar application with Magnesium and Potassium • Previous research and observations show good effects of foliar applications of Calcium, Boron (and in some situations) Nitrogen • The fieled experiment with foliar fertilization with Mg and K will be repeated this year including studies of effects on shelf life of plums ISHS Plum and Prune Symposium; Palermo, Italy 17.-19.03.08

  18. Thank you for your attention!

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