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Interactive Effects of Nitrogen-Fixing Bacteria Inoculation and Nitrogen Fertilization on Soybean Yield in Unfavorable Edaphoclimatic Environments

机译：不利的气候条件下固氮菌接种和氮肥互作对大豆产量的交互影响

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The objective of this work was to evaluate the effect of nitrogen (N) fertilization and the biological nitrogen fixation efficiency in soybean crops grown in unfavorable environments (high temperature, low fertility, and areas with sandy soil). Six field experiments were conducted between 2015 and 2018. Two experiments were performed per year. They were conducted in two separate areas. One was previously covered with degraded pasture (post-pasture area). The other was previously used to plant soybean (post-soybean crop area). The treatments consisted of inoculations with N-fixing bacteria (NFB) (0, 4, 8, and 12 doses ha−1) and N fertilization with rates of 0, 25, 50, and 100 kg ha−1. N fertilization and inoculation with NFB increased soil N, though the levels were still low. Among the tested groups, those with the application of eight doses of inoculant recorded the highest grain yields in post-soybean areas. They showed 10% (237 kg ha−1) and 15% (336 kg ha−1) higher grain yields when compared to crops treated without inoculant and crops with four doses of inoculant, respectively. N fertilization with 25 and 100 kg ha−1 decreased the root nodules of soybean plants grown in the post-soybean and post-pasture areas, respectively. Soybean crops grown on degraded pasture areas also showed good response to N fertilization (50 kg ha−1) when combined with NFB inoculation (12 doses ha−1). These showed grain yields 22% (439 kg ha−1) higher than those of plants treated with just 12 doses of inoculant and no N fertilization.
机译：这项工作的目的是评估在不利环境（高温，低肥力和有沙土的地区）下种植的大豆作物中氮肥的施用效果和生物固氮效率。在2015年至2018年之间进行了六次现场实验。每年进行两次实验。他们在两个不同的区域进行。其中一个以前被退化的牧场覆盖（牧后地区）。另一个以前用于种植大豆（大豆后种植区）。处理方法包括接种固氮菌（NFB）（0、4、8和12剂量ha -1 ）和施氮量分别为0、25、50和100 kg ha -1 。施氮和NFB接种增加了土壤N含量，尽管水平仍然很低。在测试组中，使用八剂接种剂的组在大豆种植后地区的谷物产量最高。与未接种接种剂和四剂作物相比，它们的谷物单产高出10％（237 kg ha -1 ）和15％（336 kg ha -1 ）高分别接种。施氮量分别为25和100 kg ha −1 减少了大豆在大豆种植后和牧草后地区的根瘤。在退化的牧区种植的大豆作物与NFB接种（12剂量ha -1 ）联合使用时，对氮肥的施用也表现出良好的响应（50 kg ha -1 ）。这些结果表明，与仅施用12种接种剂且不施氮的植物相比，谷物的产量高出22％（439 kg ha -1 ）。

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