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Soil types with different texture affects development of Rhizoctonia rootrot of wheat seedlings

机译：不同质地的土壤类型影响小麦幼苗根瘤菌根腐的发育

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The effect of different soil textures, sandy (97.5% sand, 1.6% silt, 0.9% clay), loamy sand (77% sand, 11% silt, 12% clay) and a sandy clay loam (69% sand, 7% silt, 24% clay), on root rot of wheat caused by Rhizoctonia solani Kuhn Anastomosis Group (AG) 8 was studied under glasshouse conditions. The reduction in root and shoot biomass following inoculation with AG-8 was greater in sand than in loamy sand or sandy clay loam. Dry root weight of wheat in the sand, loamy sand and sandy clay loam soils infested with AG-8 was 91%, 55% and 28% less than in control uninfested soils. There was greater moisture retention in the loamy sand and sandy clay loam soils as compared to the sand in the upper 10-20 cm. Root penetration resistance was greater in loamy sand and sandy clay loam than in sand. Root growth in the uninfested soil column was faster in the sand than in the loamy sand and sandy clay loam soils, the roots in the sandy soil being thinner than in the other two soils. Radial spread of the pathogen in these soils in seedling trays was twice as fast in the sand in comparison to the loamy sand which in turn was more than twice that in the sandy clay loam soil. There was no evidence that differences among soils in pathogenicity or soil spread of the pathogen was related to their nutrient status. This behaviour may be related to the severity of the disease in fields with sandy soils as compared to those with loam or clay soils.
机译：不同土壤质地，沙质（97.5％砂，1.6％淤泥，0.9％粘土），壤土型砂（77％沙，11％淤泥，12％粘土）和砂质壤土（69％沙，7％淤泥）的影响，在温室条件下，研究了由solani根瘤菌8号引起的小麦根腐病（24％粘土）。用AG-8接种后，沙土中根和茎生物量的减少大于壤土或砂质壤土。在被AG-8侵染的沙土，壤质沙土和砂质壤土中，小麦的干根重分别比未侵染的对照土壤低91％，55％和28％。与上层10-20厘米的沙相比，壤土和沙质壤土的水分保持力更大。壤土和砂质壤土中的耐根渗透性大于沙土。在未受侵染的土壤中，沙土的根生长快于壤土和砂质粘土壤土，沙质土壤的根比其他两种土壤细。与砂质壤土相比，病原体在苗盘中这些土壤中的径向传播速度是砂质壤土的两倍，后者又是砂质壤土土壤的两倍。没有证据表明土壤之间的致病性或病原体土壤传播差异与其养分状况有关。与砂壤土或黏土相比，这种行为可能与沙质土壤田间疾病的严重程度有关。

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