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Recovery of Nitrogen by Rice from Blue-Green Algae Added in a Flooded Soil¹

ABSTRACT

Uptake of N from a blue-green alga (Aulosira 68) by rice (Oryza sativa L.) was studied in a greenhouse pot experiment. When a suspension of the alga was buried 5–7 cm deep, 52% of the N added was recovered in the grain and straw of the first rice crop, and an additional 5% was recovered by a ratoon crop and by a subsequent transplanted crop. Additions of NH₄Cl equivalent to 100 kg N/ha did not affect the recovery of algal N. Surface placement of the alga reduced recovery by the first crop to 37% of the added N.

¹ Joint contribution of the Dep. of Agronomy, Cornell Univ., and The Boyce Thompson Institute, Ithaca, NY 14853. The work was supported in part by a grant from the U.N. Development Program.

² Former Graduate Research Assistant, presently Microbiologist, R. S. Kerr Environmental Research Laboratory, Ada, OK 74820.

³ Postdoctoral Research Associate, Boyce Thompson Institute, Ithaca, N.Y.

⁴ Former Postdoctoral Research Associate, Cornell Univ., presently Assistant Professor, Dep. of Agronomy, Univ. of Hawaii, Honolulu, HI 96822.

Received for publication March 27, 1980. Accepted for publication August 11, 1980.