Abstract
Azolla and urea application in a rice field transplanted with square (20 cm×20 cm) and rectangular (10 cm×40 cm) spacings for three consecutive seasons were found to increase significantly uptake of N and P by the rice plants, irrespective of seasons. Azolla treatments increased the organic C content of the soil during both wet and dry seasons, while its N and P contents were more only during the wet seasons. Urea did not affect N, P and organic C contents of the soil. Spacing had no significant effect on N and P uptake by the rice plant or N, P and C contents of the soil.
Maximum N and P uptake in rice were obtained by growing two crops of Azolla after transplanting in addition to its incorporation before transplanting. This treatment showed significantly more N uptake than the urea at 60 kg N ha−1 during wet and dry seasons of 1982. Among Azolla treatments, twice Azolla dual cropping although showed comparatively lower uptake of N and P, it was comparable to that of 60 kg N ha−1 urea.
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Singh, A.L., Singh, P.K. Influence of Azolla management on the growth, yield of rice and soil fertility. Plant Soil 102, 49–54 (1987). https://doi.org/10.1007/BF02370899
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DOI: https://doi.org/10.1007/BF02370899