Chrysanthemums in Aberdeen

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Common Pests:
- Thrips
- Leafminer
- Earwigs
- Slugs 
- Whitefly
- Capsid Bug
- Caterpillars
- Red Spider Mite
- Vine Weevil
- Sciarid Fly
- Stool Miner

Common diseases: 
- White Rust
- Verticillium Wilt
- Powdery Mildew
- Crown Gall
- Chrysanthemum Rust
- Botrytis

Common disorders:
- Nitrogen 
- Phosporus
- Potassium 
- Magnesium
- Manganese
- Copper
- Iron
- High Salt levels

Suggested settings:
- Monitor

- contact me

Date last updated: 
10 July 2008


Phosphorus (last updated 10 July 2008 )

Phosphorus has a negative charge; however it sticks strongly to aluminium and iron. It does this particularly well if the soil pH is below 7, if you raise the pH with calcium it stick to the calcium ions.

 The plant cannot remove Phosphorus from either, therefore Phosphorus is most readily available at a pH of 6.5 .

Phosphorus is very immobile in soils, it doesn't move to the roots, therefore it is essential to create the best conditions to promote good root activity so that the comprehensive root system comes in contact with enough P. Soil porosity is important to ensure sufficient oxygen is present for respiration soils with organic matter present are more likely to have a strong mycorrhiza population, mycorrhiza live off sugars in the plants roots but help to pull in phosphates in return, this symbiotic relationship with plants is beneficial to both. 

As mentioned in the nitrogen report, phosphorus is needed to synthesise important molecules such as proteins and DNA which are responsible in cell development.

Phosphate Deficiency

The picture above shows the smaller plant deficient in phosphorus, exhibiting yellowing and eventual death of lower leaves.

In mild deficiency cases growth is checked and spindly, new leaves are dark green and reduced in size, lower leaves may become orange/green in colour. 

Severe deficiency will cause stunted plants with young leaves dark green and reduced in size. Lower leaves become orange with browning at the margins resulting in death of affected leaves. Flowering is delayed, bloom size reduced and fewer blooms on sprays. Petals may suffer some loss of colour.

Where there is an excess of phosphate certain micro-nutrient deficiencies may  be result e.g. iron, copper, manganese.

Remedial Actions
For deficiency feed with mono ammonium phosphate dissolved in water, or apply super phosphate directly to the soil and water in.

For excess water heavily in an attempt to leach excess, be aware of possible micro-nutrient deficiency.

Other information 


Website designed and published by Paul Barlow with input from Ivor Mace
Copyright 2008 Paul Barlow.