The invention relates to the technical field of
azolla culture and
soil fertility increasing, in particular to a method for continuously increasing the yield of
azolla in a rice field leisure period, which comprises the following steps of: culturing aquatic
green manure azolla with high
growth speed and high biological
nitrogen fixation efficiency in the rice field leisure period, and turning and pressing the azolla at 4 / 5 of the field surface into soil through regular turning and pressing; a new round of growth space is provided for the remaining 1 / 5 of azolla, aging and death of the azolla can be avoided,
phosphorus-
potassium-
calcium-
magnesium fertilizer is applied,
nutrient proportion balance is ensured, continuous and rapid growth of the azolla and resistance enhancement of the azolla can be achieved,
nutrition is applied again in the early stage of azolla culture, rapid propagation of the azolla can be achieved, and the
survival rate of the azolla is increased. Nutrients released by rapid
decomposition of azolla can be recycled by later-reap azolla, rapid growth and continuous high yield of later-reap azolla can be realized only by slightly applying the nutrients, and the method not only can save
fertilizer and improve efficiency, but also can input a large amount of
nitrogen in a biological
nitrogen fixation way into rice
field soil in a short time to fertilize the rice
field soil.