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In this paper, the indoor biology determination pot experiment, field trials under different conditions of soil bacteria growth inhibition of soybean root rot pathogens (Fusarium, the legislation Rhizoctonia solani and Penicillium) and reduce soybean root rot The role of the disease condition. The results show that: soil bacteria Fusarium mycelial growth, sporulation and soybean growth period the number of non-rhizosphere Fusarium rhizosphere to a certain extent, the greater the amount of bacterium, the higher the inhibition rate when The amount of the bacterium the the the 5 × 106cfu/ml bacteria their mycelial growth and sporulation inhibition rate of 98.9%, 98.3%; access bacteria sooner the greater the inhibition of Fusarium; With the pH increase in bacterial inhibition of Fusarium gradually increasing, when pH = 8.5 when, bacterial their mycelial growth and sporulation highest inhibition rate were 55.7%, 91.0%; range of 10 ~ 25 ℃, bacteria. Fusarium inhibition with increasing temperature decreased from 25 ~ 35 ℃ inhibition increased when the temperature is 10 ° C, bacterial their mycelial growth and sporulation inhibition rate were 60.3% , 98.5%; soil water content in the range of 10% to 42%, the rate of bacterial inhibition of Fusarium with water content increased first and then decreased when the water content of 42%, the average inhibition rate up to 45.7%; When mixed fertilizer NPK fertilizer (N = 150mg/kg soil, P = 100mg/kg soil, the K = 50mg/kg earth), bacteria Fusarium inhibition rate than single application of handling higher. The Rhizoctonia solani mycelial growth and soybean rhizosphere soil bacteria opposition non Rhizoctonia solani rhizosphere the quantity significantly inhibited with the bacterium increased its inhibition increases; access the bacteria sooner the inhibition rate higher; gradually increases with the increase of pH, inhibition of bacterial antagonism Rhizoctonia, when the pH = 8.5, the inhibitory effect up to 42.1%; as the temperature rises, bacteria Rhizoctonia bacterial inhibition role reduced to increase the temperature of 35 ° C, the inhibition rate up to 51.6%; increase with the water content in soil moisture content of 10% to 42% of bacteria Rhizoctonia bacteria inhibition rate decreased first liter high trend, when the soil moisture content of 10%, the inhibition rate of up to 62.9%; processing of organic manure (organic fertilizer = 400mg/kg soil), bacterial antagonism suppression of Rhizoctonia solani up to 42.1%. Soil bacteria of Penicillium role is with the increase in the amount of bacterium, the number of Penicillium gradually reduced, when the amount of access bacterium 9 × 107cfu / g dry soil, 46.1% of the average inhibition rate of the bacteria in the rhizosphere Penicillium non-rhizosphere is as high as 54.4%; bacteria was applied to the period of the sooner, the more obvious inhibition of Penicillium; bacterial inhibition of the soybean rhizosphere Penicillium number first decreases with increasing pH. increases. when pH = 8.5, bacteria The highest the Penicillium average inhibition rate was 38.1%; bacterial inhibition of Penicillium with increasing temperature first and then decreased, when the temperature is 15 ° C, the inhibition rate up to 81.8% , when the temperature is 25 ° C, the minimum inhibitory rate of 44.1%; bacteria gradually increased as soil moisture increased inhibition of Penicillium, the water content of 42%, the inhibition rate of up to 86.7%; When single applying potassium fertilizer (K ??= 50mg/kg soil), the average inhibition rate of the bacteria Penicillium up 34.0% when NPK three kinds of fertilizer mixed fertilizer, bacteria lowest the Penicillium average inhibition rate 24.0%. The dynamic interaction of soil bacteria and soybean root rot pathogens research results show that: the bacterial inhibition in soybean seedling and flowering, pod of bacterial inhibition was significantly reduced, until the time of maturity bacteria have almost no inhibition. Was applied to bacteria, the inhibition effect of holding can be maintained for 60 to 80 days from sowing. This study shows that soil bacteria had certain inhibition of soybean root rot pathogens (Fusarium fungus, Rhizoctonia solani, Penicillium), it artificially adjust the soil environmental conditions conducive to bacterial growth, or Adding bacteria by human pathogenic fungi to control and reduce the role of root rot disease. Provided the basis for the biology, ecology, prevention and treatment of soybean root rot.
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