This document describes several physiological disorders that can affect pea plants, including deficiencies of phosphorus, nitrogen, calcium, magnesium, sulfur, potassium, manganese, boron, and zinc. It provides the key symptoms for identifying deficiencies of each nutrient, such as purple or reddish leaves for phosphorus deficiency, yellowing of older leaves for nitrogen deficiency, and marginal leaf scorching for magnesium and manganese deficiencies. The document also briefly mentions molybdenum deficiencies in brassicas, chimaera genetic variations, and blindness in sweet pea growing points.