A method of using nitrogen-fixing cyanobacteria to improve acidified soil and improve soil fertility

Abstract

The invention discloses a method for improving acidified soil and enhancing soil fertility by the aid of nitrogen-fixation cyanobacteria. The method includes steps of 1), selecting anabaena to be usedas nitrogen-fixation cyanobacteria application algae species, and carrying out step-by-step extended culture; 2), deeply plowing crop rotation fields by the depths of 15-20 cm at early-season rice transplanting earlier stages in double-cropping rice modes at first, transplanting rice, then applying nitrogen, phosphorus and potassium fertilizers, inoculating the nitrogen-fixation cyanobacteria according to a quantity of 3-5 kg of fresh alga for each mu, harvesting early-season rice, then shallowly plowing the crop rotation fields by the shallow plowing depths of 5-10 cm, planting late rice, and applying the nitrogen-fixation cyanobacteria and nitrogen, phosphorus and potassium fertilizers according to the same process; alternately, deeply plowing the crop rotation fields by the depths of 15-20 cm at first at rice transplanting earlier stages in single-cropping rice modes, transplanting the rice, then applying the nitrogen, phosphorus and potassium fertilizers, and inoculating the nitrogen-fixation cyanobacteria according to a quantity of 5-7 kg of fresh alga for each mu. The method has the advantages that the application amount of nitrogen fertilizers can be reduced by 50%, the nitrogen-fixation cyanobacteria can be fed into red soil along with deep plowing or shallow plowing, the organic matter content of the red soil can be increased after the nitrogen-fixation cyanobacteriais decomposed, and accordingly the soil fertility level of the red soil can be comprehensively enhanced.

Description

technical field [0001] The invention belongs to the technical field of algae biotechnology and fertilizing soil fertility, and in particular relates to a method for improving acidified soil and improving soil fertility by using nitrogen-fixing cyanobacteria. Background technique [0002] my country is the largest rice producer in the world, ranking first in output and second in the world in terms of production area. Among the three major grain crops of rice, wheat and corn in my country, rice is the crop with the largest planting area, accounting for 35% of the grain planting area in my country. With the rapid growth of my country's population and the continuous reduction of arable land, the contradiction between food security, resource consumption and environmental protection has become increasingly acute. In recent years, the amount of chemical fertilizers in my country has continued to grow at a high speed, but the output of food crops has grown slowly, which shows that ...

AI Technical Summary

Problems solved by technology

The traditional methods of increasing soil organic matter mainly include adding decomposed organic manure, returning straw and returning green manure to the field, but these methods have their own shortcomings and application limitations, such as the sources of decomposed organic manure are not wide enough; and large-scale agricultural machinery operations Straw returning to the field cannot be popularized, and the cost of small-scale straw returning to the field is high; green manure planting and returning to the field will indirectly increase the input cost of farmers

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