The invention relates to a blue-green alga-rice complex operation
nitrogen-fixing and carbon-fixing method.
Anabaena azollae,
anabaena sphaerica and
anabaena flosaguas are taken as initial materials, and after expanded culture of strains in a sterile chamber and scale production in a small
pool of a
greenhouse, the strains are processed with the help of a screen to enable the
water content to be 40%-60%; then mixing, stirring and crushing are performed at the day according to the weight ratio of 2: 6: (2-3): 4: 3, and a mixture is uniformly sprayed into a watered rice field with the density of 2-5g / m<2>; or wet
algae are placed in an oven at the temperature of 35-40 DEG C for 8h or placed under a
fluorescent lamp of 30-50W in the sterile chamber for
drying for 3-5 days to enable the
water content to be 8%-12%, crushing is performed by using a crushing
machine, dry alga
powder is uniformly blended according to the weight ratio of 1: 8: (1-2): 6: 2 and mixed in 5-10 times of the weight of rice
husk, and the dry alga
powder is uniformly sprayed into the watered rice field with the density of 0.5g / m<2>. According to the method disclosed by the invention,
nitrogen-fixing blue-
green algae are cultivated and stocked in the rice field as a
fertilizer source, CO2 is absorbed, organic matters are generated, soil is improved, the yield and quality of paddy rice are improved, and the method has the advantages of simple process, easiness in popularization, safety, high efficiency, no
pollution and the like.