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Phosphorus deficiency: early phosphorus deficiency affects root development and seedling growth; phosphorus deficiency from bud-breaking to flowering, leaf crumpling, dark green color, serious basal leaves become lavender, plant stiffness, petiole, leaflets and leaf margins facing upward, do not unfold horizontally, the leaflet area is narrowed, the color of dark green. When there is too much phosphorus deficiency, growth is greatly affected, and rust-colored traces are easy to occur inside the potato.

Prevention methods:

(1) application of composted compost or fully rotted organic fertilizer, the use of formula fertilization technology.

(2& # 41; lack of phosphorus: seedling and planting period should pay attention to the application of sufficient phosphorus fertilizer, culture soil required to have 1000 ~ 1500 mg of phosphorus pentoxide, but also foliar spraying 0.2% ~ 0.3% potassium dihydrogen phosphate or 0.5% ~ 1% aqueous solution of calcium superphosphate.

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