Biodiversity, productivity and socio-economic impacts of azolla utilization in rice production
1991
Tisico, A.S.
This study aimed to evaluate the impacts of Azolla utilization in rice production. Biodiversity in the Azolla inoculated and not inoculated farms was studied. Species diversity index of arthropods was not significantly affected by inoculation of Azolla. However, it was found that the total population of rice pests tend to be lesser in the Azolla users farm than in the non-users farm. The use of Azolla tend to favor the proliferation of blue green algae (BGA) over the greens, euglenoids, and diatoms. Nostoc and Anabaena responded well to the conditions accompanying Azolla use in farms. With or without Azolla utilization the algal communities have similar degree of variability in terms of the number of taxa. Productivity in the fields of Azolla users was higher than that of the non users. Azolla users had an average yield of 100 cavans per hectare, while non users had an average yield of 82 cavans per hectare. In the comparative analysis between users and non users of Azolla, the utilization of Azolla did not have any effect on the levels of living of respondents in Pakil and Pangil, Laguna [Philippines]. Both users and non users of same belonged to the middle to above middle class. Azolla users however obtained an income of around P1,911.00 (US$70.78) over that of the non users.
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