Rhizobium Inoculation Improved the Rhizosphere P Dynamics and P Uptake Capacity of Pigeon Pea Plants Grown in Strongly Weathered Soil Only under P Fertilized Conditions
Rhizobium Inoculation Improved the Rhizosphere P Dynamics and P Uptake Capacity of Pigeon Pea Plants Grown in Strongly Weathered Soil Only under P Fertilized Conditions
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DOI：
10.3390/agronomy12123149
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Saki Yamamoto;Shin Okazaki;Nakei D. Monica;Naoko Ohkama‐Ohtsu;Haruo Tanaka;S. Sugihara
中科院分区：
文献类型：
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作者：
Saki Yamamoto;Shin Okazaki;Nakei D. Monica;Naoko Ohkama‐Ohtsu;Haruo Tanaka;S. Sugihara
由于磷素的缺乏，提高磷素利用效率是作物生产中的一个关键问题。特别是在强风化的土壤中，具有高的磷固定能力，低的PUE通常会限制植物的生长。在这里，在一个为期70天的木豆栽培盆栽试验中，我们评估了接种根瘤菌（−I/+I）对植物生长、根际、土壤磷动态和植物根系磷吸收特性的影响，有或没有施磷（0 P：不施磷; 50 SSP：50 kg P ha−1与单一过磷酸钙）。接种根瘤菌与施磷肥（50 SSP + I）相结合，植株生长、吸磷量和有机酸含量分别提高了63%、41%和130%，而不施磷肥（0 P + I）则没有提高。50 SSP + I处理下，根际土壤中活性和中等活性无机磷（NaHCO 3-Pi和NaOH-Pi）含量分别比根际土壤高55%和44%，说明50 SSP + I处理对施入的磷有较好的增溶作用。50 SSP + I处理的PUE（26%）高于50 SSP −I处理（15%）。因此，这些结果表明，接种根瘤菌与50 SSP应刺激植物根系磷的获取特性，导致在根际和有效的植物磷吸收的增溶施磷。可见，50 SSP + I处理能有效提高强风化土壤中木豆的PUE。
The improvement of phosphorus (P) use efficiency (PUE) is a critical problem in crop production because of phosphorus’ scarcity. Especially in strongly weathered soil with a high P fixation capacity, a low PUE generally limits plant growth. Here, in a 70-day pigeon pea cultivation pot experiment using Ultisols, we evaluated the effects of Rhizobium inoculation (−I/+I) on the plant growth, rhizosphere, bulk soil P dynamics, and plant root P acquisition characteristics, with or without P fertilization (0P: no P application; 50SSP:50 kg P ha−1 with single superphosphate). The combination of Rhizobium inoculation with P fertilization (50SSP + I) increased the plant growth, P uptake, and organic acid content per pot by 63%, 41%, and 130%, respectively, but not without P fertilization (0P + I). The labile and moderately labile inorganic P (NaHCO3-Pi and NaOH-Pi) contents were higher (55% and 44%, respectively) in the rhizosphere soil than those in the bulk soil in the 50SSP + I treatment, indicating the efficient solubilization of the applied P under the 50SSP + I treatment. The fertilized PUE was higher in the 50SSP + I treatment (26%) than that in the 50SSP−I treatment (15%). Thus, these results suggest that Rhizobium inoculation with 50SSP should stimulate plant root P acquisition characteristics, leading to the solubilization of applied P in the rhizosphere and efficient plant P uptake. In conclusion, the 50SSP + I treatment effectively improved the PUE of pigeon peas in strongly weathered soil.