N. S. Berja

The utilization of the Azolla - Anabaena complex as a nitrogen fertilizer for rice

I. Watanabe, C. Espinas, N. S. Berja, 1977 .

The growth of four species of Azolla as affected by temperature

I. Watanabe, N. S. Berja, 1983 .

Growth of Azolla in paddy field as affected by phosphorus fertilizer

I. Watanabe, N. S. Berja, Diana C. Del Rosario, 1980 .

The Azolla-Anabaena complex and its use in rice culture

I. Watanabe, N. S. Berja, K. Bai, 1981 .