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Nitrogen Effects on Cotton: I. Vegetative and Fruiting Characteristics¹

ABSTRACT

A series of N fertilization experiments was conducted over three growing seasons, at three elevations, utilizing two varieties of ‘Acala’ cotton (Gossypium hirsutum) on two soil types. The treatments consisted of various rates and timing of N fertilizer applications. Data indicated that N deficiency at early growth stages limited development of vegetative branches, internode elongation, and fruiting, particularly in "one-peak" flowering areas. Cotton plants can compensate by increased fruiting in longer seasons or "two-peak" flowering areas when adequate N is available during late season following earlier N deficiency. The effect of N applications on fruiting and yield was dependent on the intial N fertility of the soil and the yield possibility. When N was limited, yield and fruiting were increased by N applications. Petiole analyses were used to show the relationship between N nutrition and yield and fruiting.

¹ Contribution from the Dep. of Agr. Chem. and Soils, Arizona Agr. Exp. Sta., Tucson, Ariz. Presented before Div. S-4, Soil Sci. Soc. Amer., Dec. 1960. Published with the approval of the Director as Journal Article no. 1155. Investigation was supported in part by a grant-in-aid from the US Steel Corp. This paper resulted from a dissertation submitted by the senior author in partial fulfillment for the Ph.D. degree at the Univ. of Arizona.

² Former Graduate Assistant and Professor and Soil Scientist, respectively. Dep. of Agr. Chem. and Soils, Univ. of Arizona, Tucson. Senior author is now Assistant Agricultural Chemist, Arizona Agr. Exp. Sta., Yuma.

Received for publication February 7, 1967. Accepted for publication August 8, 1967.