INFLUENCE OF AZOLLA-ANABAENA SYMBIOSIS ON RICE (Oryza sativa L) CROP AS A NUTRITIONAL ALTERNATIVE
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Instituto Nacional de Ciencias Agrícolas
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With the objective of studying the influence of Azolla as green manure or associated to rice crop under controlled conditions, an experiment was carried out during the period of May-October, 1997, using a randomized complete design. 16 treatments were evaluated resulting from the combination of four nitrogen levels (0, 40, 80, 120 kg.ha-1 N) and four cropping systems (rice as monoculture, rice+incorporated Azolla, rice+incorporated Azolla + associated Azolla, rice+associated Azolla) and each treatment was replicated four times. Results showed that rice was positively influenced by the use of Azolla in all variants used, emphasizing the combination of fern incorporation and its association with rice. This allowed to increase plant height, number of effective tillers, leaf area and dry matter, as well as a noticeable increment in nutrient extraction by this cereal. The use of Azolla also increased organic matter and potassium contents of the soil. A positive effect was also observed by increasing nitrogen fertilization levels.
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