Phosphorus, Phosphorus Deficiency , Phosphorus Deficient, Mineral Deficiency, Nutrient Deficiency
Phosphorus is essential for healthy growth and increased vigour in plants. Phosphorus deficiencies arise when soils are highly acidic, clay-based or if gardens are located on chalk downs. Also, heavy rainfall can be a contributing factor, making the overall leaching effect worse. Most of the time, the symptoms are different from a plant with a nitrogen deficiency. However, on Brassicas, it can be difficult to distinguish between the two disorders. Likewise, symptoms can appear similar to a plant with root damage, so if possible, inspect the roots if a phosphorus deficiency is suspected.
Flowering and fruiting reduced
Leaves don't grow to the full size
Leaves begin to drop from the bottom up
Leaves may turn blue-green with purple undertones
Currants turn bronze with brown-purple spots
Sometimes leaves of potato show scorching
NPK fertilisers should be applied to the media before or during planting; please take care to follow the manufacturer's instructions. Alternatively, you can increase phosphorus levels using sulphur-phosphate or manure. If your soil is prone to phosphorus deficiencies, phosphorus substitutes should be laid with seed or placed as close to seedlings/ plants as possible, for effective absorption by the plant.