INFLUENCE OF AZOLLA-ANABAENA SYMBIOSIS ON RICE (Oryza sativa L) CROP AS A NUTRITIONAL ALTERNATIVE
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Abstract
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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