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Molybdenum Deficiency Symptoms in Cotton¹

ABSTRACT

Molybdenum deficiency symptoms were developed in first generation cotton (Gossypium hirsutum, var. Coker) growing in purified nutrient solutions. The first symptoms appeared when the plants were 7 weeks old. The young leaves became chlorotic between the veins, while the old leaves became greasy and swollen between the veins. Cupping of their margins occurred either upward or downward. Addition of Mo in the nutrient solution of the deficient plants corrected all deficiency symptoms and allowed the plants to develop normally again. The Mo content of the leaves exchibiting advanced deficiency symptoms was 1.14 ppm, of leaves exchibiting incipient deficiency symptoms was 1.88 ppm, and of healthy leaves was 2.37 ppm.

Key Words: water cultures • nitrogen/phosphorus ratio

¹ Contribution from the Inst. of Soils and Fertilizers of the Ministry of Agriculture, Athens, Greece. Presented before Div. S-4, Soil Science Society of America, at Stillwater, Okla., Aug. 25, 1966.

² Chemist and Chemist-Soil Scientist, respectively, in the Inst. of Soils and Fertilizers, Ministry of Agr., Athens, Greece.

Received for publication December 12, 1966. Accepted for publication March 21, 1967.