Nitrogen-deficient corn and maize plants are typically stunted, grow slowly, and show signs of early aging. Maize lacking in nitrogen often has thin stalks, with older leaves turning yellow or purple. Phosphorus-deficient maize exhibits purplish leaves and underdeveloped ears, while potassium-deficient plants may have weak stems and dark green, curling leaves.
In wheat, nitrogen deficiency leads to smaller, pale green leaves and reduced growth. Phosphorus-deficient wheat may show red stems and poor grain development, while potassium-deficient wheat is prone to lodging, with older leaves turning dark green and weak.
Cotton suffering from nitrogen deficiency shows yellowing at the leaf tips and reduced yield. Deficiency in nitrogen also delays maturity, causing buds to drop prematurely. Potassium-deficient cotton develops rolled leaves, and bolls become thin and difficult to form.
Peanuts with nitrogen deficiency exhibit yellow, sparse foliage and poor growth. Phosphorus-deficient peanuts have small, poorly developed pods, with old leaves showing blue or reddish discoloration at the base. Potassium-deficient peanuts display light green leaves and empty pods.
Soybeans affected by nitrogen deficiency struggle with nitrogen fixation, leading to overall poor growth. They are highly sensitive to phosphorus deficiency, which can cause stunted growth and delayed development. Potassium-deficient soybean leaves develop yellow edges, and the seeds are small and of low quality.
Sweet potatoes with nitrogen deficiency grow slowly and have pale leaves. Phosphorus-deficient sweet potatoes show large yellow spots on older leaves, while potassium-deficient plants have grayish leaves near the growing point and reduced yields.
Tobacco plants with nitrogen deficiency have poor color and slow growth. Phosphorus-deficient tobacco leaves are dark in color, and the plant appears thin and weak. Potassium-deficient tobacco leaves show dry spots along the margins.
Rapeseed plants with nitrogen deficiency show premature leaf death, weak growth, and small, pale leaves. Phosphorus-deficient rapeseed grows slowly, with empty seed pods and darkened leaflets. Potassium-deficient plants have thin stems and are prone to lodging.
Cabbage with nitrogen deficiency has yellow, weak leaves and poor growth. Phosphorus-deficient cabbage is short, with small, dark green leaves. Potassium-deficient cabbage shows brown edges on leaves and reduced disease resistance.
Watermelon plants with nitrogen deficiency have pale leaves and slow growth. Phosphorus-deficient watermelons experience delayed flowering and underdeveloped seeds. Potassium-deficient watermelons show short vines, with brown roots and poor fruit quality.
By understanding these symptoms, farmers can better identify nutrient deficiencies and apply appropriate fertilizers to improve crop health and yield.
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