Image Number: 1402094

Delayed growth, particularly in the early season, is typical of Phosphorus (P) deficiency. Plants may be dark green in color if N levels are adequate, and leaves may be narrower than normal. Small, necrotic spots may appear on the lower leaves when deficiency is severe. Due to generally adequate levels of P in previously cropped and well-fertilized soils, deficiencies of this element are rare and often temporary. Photo shows plants in a low P soil on right. P shortages may be induced if root growth is restricted. High soil or fertilized if root growth is restricted. High soil or fertilizer P levels may result in more rapid early growth but not increased yields. As the root system expands, growth differences between various P levels become less apparent.
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United States


Kingdom: Other damage agents
Phylum: Other damage agents
Class: Other damage agents
Order: Abiotic
Family: Nutrient deficiency
Subject: phosphorous deficiency


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
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Image uploaded:
Sunday, March 10, 2002
Image last updated:
Wednesday, May 4, 2011