Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain.
Plant Biol (Stuttg). 2013 Mar;15(2):415-21. doi: 10.1111/j.1438-8677.2012.00634.x. Epub 2012 Sep 28.
Increasing soil salinity represents a major constraint for agriculture in arid and semi-arid lands, where mineral nitrogen (N) deficiency is also a frequent characteristic of soils. Biological N fixation by legumes may constitute a sustainable alternative to chemical fertilisation in salinity-affected areas, provided that adapted cultivars and inoculants are available. Here, the performance of three peanut cultivars nodulated with two different rhizobial strains that differ in their salt tolerance was evaluated under moderately saline water irrigation and compared with that of N-fertilised plants. Shoot weight was used as an indicator of yield. Under non-saline conditions, higher yields were obtained using N fertilisation rather than inoculation for all the varieties tested. However, under salt stress, the yield of inoculated plants became comparable to that of N-fertilised plants, with minor differences depending on the peanut cultivar and rhizobial strain. Our results indicate that N fixation might represent an economical, competitive and environmentally friendly choice with respect to mineral N fertilisation for peanut cultivation under moderate saline conditions.
土壤盐渍化的加剧是干旱和半干旱地区农业的主要限制因素，而这些地区的土壤也常常缺乏矿物氮（N）。在受盐影响的地区，豆科植物的生物固氮可以替代化学肥料，只要有适应的品种和接种剂可用。在这里，评估了在中度盐水中灌溉下，三种花生品种与两种耐盐性不同的根瘤菌菌株共生的表现，并与施肥植物进行了比较。地上部重量被用作产量的指标。在非盐渍条件下，与接种相比，所有测试品种的氮肥施肥都能获得更高的产量。然而，在盐胁迫下，接种植物的产量与施肥植物相当，具体差异取决于花生品种和根瘤菌菌株。我们的结果表明，在中度盐渍条件下种植花生时，与矿物氮施肥相比，生物固氮可能是一种经济、有竞争力且环保的选择。
