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[转载]气候干旱影响根瘤菌在土壤内的存活

已有 2273 次阅读 2012-12-22 10:35 |个人分类:根瘤菌在农业上的应用|系统分类:科研笔记|关键词:干旱,根瘤菌,存活| 干旱, 根瘤菌, 存活 |文章来源:转载

气候干旱影响根瘤菌在土壤内的存活,正因为如此,每年对豆科作物进行接种根瘤菌工作成为必要。

原文见这里:http://corn.osu.edu/newsletters/2012/2012-26/survival-of-soybean-rhizobia-cells-in-soil

Return to C.O.R.N. Newsletter 2012-26

Survival of Soybean Rhizobia Cells in Soil

Harold Watters researching rhizobia populations while in the Ukraine

Survival of Soybean Rhizobia Cells in Soil
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The dry weather of 2012 has given cause for worry about many areas of crop production. On a recent trip to Ukraine, it became obvious that high soil temperatures and dry surface conditions there have greatly reduced rhizobia populations. This is a country where soybeans are only recently being established, first year soybeans even with inoculants applied are suffering from lack of nitrogen due to the lack of rhizobia development. While we in Ohio have a long relationship with soybean and rhizobia, conditions this year may lead to concerns for next year.

Soybean rhizobia bacterial cells survive best when they are in a moist soil environment and an ambient soil temperature of 40-80 degrees F.  The drought throughout the Ohio in 2012 has resulted in the top six inches of soil becoming extremely dry and very hot in many fields.  Either a very dry soil environment or a very hot soil environment causes the rapid death of rhizobia cells and the combination is lethal.  Therefore, we would expect a reduction in the population of residual soil rhizobia cells in many Midwestern soybean fields in 2012 due to those soil conditions.  Although many cells will survive the extreme environmental conditions, those cells will have evolved into survival mode and will have lost much of their potential to provide nitrogen to soybean plants in 2013. That means the surviving rhizobia population will likely be less productive next year than in previous years. That reduced productivity should translate into increased yield responses to inoculating soybeans and other legume seeds in the spring of 2013. 



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