Maças - Chlorosis
Sintomas
Old leaves bluish-green with scorched margins (brown or grey). Margins may first appear light green and later turn necrotic. Necrosis progresses from the margins inward to the midrib.
Causas
Potassium deficiency
Frost and drought can cause similar symptoms
Maças - Necrosis
Sintomas
Old leaves bluish-green with scorched margins (brown or grey). Margins may first appear light green and later turn necrotic. Necrosis progresses from the margins inward to the midrib.
Causas
Potassium deficiency
Frost and drought can cause similar symptoms
Potassium deficiency piorado por
- Acidic soils (low pH)
- Sandy or light soils (leaching)
- Drought conditions
- High rainfall (leaching)
- or heavy irrigation
- Heavy clay (illite) soils
- Soils with low K reserves
- Magnesium rich soils
Potássio É importante para
- New growth is healthy
- Cold hardiness is improved
- Flower number increases
- Fruit are longer and are generally more intensely coloured
- Fruit may mature earlier and have improved flavour
- Yields are increased
Produtos recomendados pela Yara Potássio
YaraVita FOLIAR POTASH
Apple: 5 l/ha at bud burst. Also, two to three applications of 2 to 3 l/ha at 10 to 14 day intervals starting at petal fall. A further application of 5 l/ha may also be applied post-harvest before leaf fall. Water rate: 500 l/ha.
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