苹果 - Chlorosis
症状
Leaf growth is reduced and leaves are pale green / yellow in colour. Chlorotic leaves eventually develop necrotic blotches near the margin. Symptoms start at younger leaves.
原因
Sulphur deficiency
Nitrogen deficiency can produce similar symptoms but starts at older leaves.
Sulphur deficiency使变得更糟
- Acidic soils
- Light, sandy soils (leaching)
- Low organic matter
- Poorly aerated soils (waterlogged soils
- ) Areas with low industrial emissions
硫很重要
- New growth healthy and green
- Fruit number and size increased
- Overall yield is greater
对于硫雅苒推荐的产品是
YaraVita THIOTRAC 300
Apple: 3 to 5 l/ha before the start of flowering. Repeat at fruit set and 10 to 14 days later if necessary or after harvest before leaf fall. Water rate: 500 to 1000 l/ha. WARNING Do not apply during flowering. This product contains an active ingredient which, when used at rates around 15 l/ha, has been found to cause fruit thinning. These rates may also cause leaf scorch and Yara does not warrant this application.
阅读更多关于YaraVita THIOTRAC 300
