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Calcium Deficiency ✔X Fertiliser Glossary of Terms Herbicides Iron Deficiency Manganese Molybdenum Phosphorus Potassium Deficiency ✔X References Salinity Sulphur Toxicity
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Appendices
HortNET New Zealand — Factors for converting MAF Quicktest results to other units13. (1) Soil: extractant ratio 4.4:20 (v/v) for Ca, K, Mg, 1:20 (v/v) for P. (2) Approximate conversion for Ca, K, Mg and P based on a constant bulk density of 0.91 g/ml for prepared ...More…
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10. Nitrogen excess
HortNET New Zealand — Excess nitrogen readily reduces the growth of kiwifruit (Photo 10a). Symptoms appear first on the older leaves as an interveinal scorching which spreads from the leaf margins towards the midrib (Photo 10b). Leaves on affected plants are very much ...More…
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13. Calcium deficiency
HortNET New Zealand — Symptoms of severe calcium deficiency develop first on recently matured leaves (Photo 13a) and spread to progressively younger leaves. Initially, the veins at the base of the leaf become necrotic and turn black (Photo 13b). As the deficiency ...More…
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14. Iron deficiency
HortNET New Zealand — Iron deficiency can be distinguished from other nutritional disorders by the development of a characteristic interveinal chlorosis of the younger leaves grading from yellow through to snow white (Photo 14a). The older leaves often remain green ...More…
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5. Phosphorus deficiency
HortNET New Zealand — Phosphorus deficiency can reduce the growth of kiwifruit without the development of obvious visible symptoms (Photo 5a). the stems of affected plants tend to be much thinner and the size of the leaves considerably reduced. Clearly recognisable ...More…
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18. Molybdenum deficiency
HortNET New Zealand — The native reserves of molybdenum in many New Zealand soils are very low13. Although extensive plantings of kiwifruit have been made on soils on which responses to molybdenum by pasture plants have been recorded13, deficiencies have not been ...More…
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15. Sulphur deficiency
HortNET New Zealand — Sulphur deficiency causes some visible symptoms which resemble those of nitrogen deficiency. These include a severe reduction in growth and the development of pale-green to yellow leaves. An important point of difference, however, is that the ...More…
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9. Manganese toxicity
HortNET New Zealand — Excess manganese severely reduces the growth of kiwifruit grown in solution culture (Photo 9a). In the field, manganese toxicity causes the growth of the current seasons canes to terminate prematurely and the internode length of these canes to ...More…
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3. Nitrogen deficiency
HortNET New Zealand — Nitrogen deficiency severely reduces the growth of kiwifruit (Photo 3a). Deficiency symptoms develop first on the older leaves and spread progressively to young leaves until the whole plant is affected (Photo 3b). Initially, there is a gradual ...More…
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1. Potassium deficiency
HortNET New Zealand — Disorders producing symptoms mainly on the older leaves - Potassium deficiency The first sign of potassium deficiency in the field is poor growth at bud break. On severely affected vines the leaves are small and pale yellow-green with a slight ...More…
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SOURCE OF SUPPLY
HortNET New Zealand — The appearance of small irregular patches of yellow tissue near the centre of the younger leaves is the first sign of boron deficiency (Photo 16a). These patches enlarge and coalesce to form an extensive area of yellow tissue on both sides of the ...More…
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12. Manganese deficiency
HortNET New Zealand — Manganese deficiency produces a light green to yellow interveinal chlorosis which appears first on recently matured leaves, but in severe cases it may affect almost all leaves on a plant (Photo 12a). The chlorosis develops initially at the leaf ...More…