Long-term utilization of azolla as organic fertilizer from lowland rice [Philippines]
1986
Lales, J.S. | Marte, R.S. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Agronomy)
The effects of continuous manuring with azolla on the yield of lowland rice and soil fertility were determined. For five consecutive cropping periods, replacing 50% of the total commercial nitrogen fertilizer input for lowland rice with azolla gave grain yield similar to that given by 90 kg N/ha from urea. Without any condition of inorganic nitrogen fertilizer, at least three azolla incorporations (equivalent to about 26 t fresh azolla/ha) during the entire cropping period were found necessary to attain grain yield comparable to that of the standard treatments. Slight increases in inorganic matter content of the soil have been observed at the end of each cropping period but there was no significant change in soil inorganic matter content after six consecutive cropping seasons and continuous utilization of azolla as green manure.
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