Laboratory and Field Investigations with Phorate-Treated Cotton Seeds1

Abstract

The absorption of P*Z-labeled phorate by cotton seeds was investigated under laboratory, greenhouse, and field conditions. Dehulled seeds absorbed much more phorate than intact seeds; however, this increased amount of phorate in the dehulled seed did not reduce germination or radicle growth. Absorption of inorganic p32 was not appreciably inhibited by the seed coat. Water absorption and respiration of germinating cotton seeds was not markedly different between untreated and treated seeds. Cotton plants grown in sand and soil from phorate-treated seeds absorbed 2% to 6% of the applied dosage, chiefly during the first 7 days after planting.