马铃薯 - Deformation
症状
Shoots are upright and thin with dull, dark green leaves. Margins of leaves are cupped upward.
Growth is stunted.
原因
Phosphorus deficiency (left)
马铃薯 - Growth retardation
症状
Lateral root development is inhibited. Tuber yield will be reduced.
原因
Phosphorus deficiency (right)
Phosphorus deficiency使变得更糟
- Acidic or very alkaline (calcareaus) soils
- Low organic matter
- Cold or wet conditions
- Crops with a poorly developed root system
- Soils with low P reserves
- Soils with a high phosphate capacity
- Iron rich soils
磷很重要
- Increased number of tubers
- Produces tubers of uniform size
- Boosts bulking and increases the yield of tubers
- Increases tuber dry matter content and starch levels
- Improves storage potential of tubers and reduces storage diseases
对于磷雅苒推荐的产品是
YaraVita MAGPHOS K
Potatoes: To increase tuber number, 10 l/ha at tuber initiation (when 50% of the tip swellings are twice the diameter of the rest of the stolon). To increase tuber size a minimum of 2 applications of 5 l/ha or 1 to 2 applications of 10 l/ha during tuber bulking (as soon as first formed tubers are 10 mm in diameter). Allow 10-14 days between applications. Water rate: 200 l/ha
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Potatoes: Apply Seniphos at 15 l/ha in 200 litres of water, at the onset of tuber initiation. The application may be repeated at bulking, using 5 l/ha in 200 litres of water repeated at 2-3 week intervals.
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