Sodium (Na) Stimulates Barley Growth in Potassium (K)-Deficient Soils by Improved K Uptake at Low Na Supply or by Substitution of K at Moderate Na Supply

Hussain, Mubshar; Ma, Qifu; Bell, R.W.

doi:10.1007/s42729-021-00458-4

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“…8) and in salt-tolerant barley and canola with 100 mg Na/kg (Ma et al 2011(Ma et al , 2015Krishnasamy et al 2014;Ma and Bell 2016). The Na alleviation of K deficiency in barley may be explained by two distinct mechanisms: low Na stimulated plant growth mainly via increased K uptake, whereas moderate Na induced more growth mainly by functional K substitution (Hussain et al 2021) soils, the difference in K and Na uptake and use between crop species hasan implication for K fertiliser management. More field work needs to assess the possibility of reduced requirement for K by crops on low-K soils that contain low to moderate exchangeable Na levels.…”

Section: Sodium Substitutionmentioning

confidence: 99%

Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review

Bell²,

Scanlan³

et al. 2022

Crop & Pasture Science

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Negative potassium (K) balances on farmlands globally are widespread because fertiliser K input is often less than losses (leaching) and removal of K in hay, straw and grain, which leads to a rundown of plant-available K. When soil K reserves are not large and the plant-available K pools are not well buffered, the risk of K rundown in soils is high. In the south-west of Western Australia, soil K rundown, particularly by continuous cropping or in systems where a large portion of crop biomass is removed, is increasing the prevalence of crop K deficiency even on soils where K was not previously a limiting factor for crop yields. While fertiliser K is required for adequate supply of plant-available K, maximising K use efficiency is also important for cropping profitability and sustainability in dryland agriculture. Plant K uptake and use efficiency can be affected by soil types, crop species and sequences, seasonal conditions, and K management. In water-limited environments, crop K nutrition, especially root access to subsoil K, plays a crucial role in promoting root growth, regulating plant water relations and alleviating biotic and abiotic stresses. Optimised use of both soil and fertiliser K is increasingly necessary to sustain crop yields under stressed conditions in the context of K rundown in soils.

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