杏仁 - Chlorosis
症状
Interveinal chlorosis and bright yellowing develop first on older leaf margins and tips and spreads back to the main vein. The leaves often have a characteristic herringbone pattern of chlorosis on new season’s growth.
Symptoms are normally most obvious later in the season during fruit fill.
原因
Magnesium deficiency
Lack of magnesium results in reduced photosynthesis leading to smaller leaves that are lighter in color, as well as poor flowering, reduced fruit size and significant fruit drop.
Magnesium deficiency使变得更糟
- Sandy soils
- Acidic soils
- Potassium rich soils
- Soils receiving high potash applications
- Cold wet periods
镁很重要
- Combats chlorosis
- Prevents premature leaf fall
- Gives healthier greener trees
