The Potassium Cycle and Its Relationship to Recommendation Development

Brouder, Sylvie M.; Volenec, Jeffrey J.; Murrell, T. Scott

doi:10.1007/978-3-030-59197-7_1

Cited by 6 publications

(19 citation statements)

References 120 publications

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“…A robust K recommendation should include not only the twofactor correlation between soil test K and crop yield, but consider geography and other covariates that may explain variation in yield response across space and time (Brouder et al 2021). Critical levels for soil test K are likely associated with clay type and content, soil CEC and nonexchangeable K. For example, illite is a significant clay mineral in some soils but its role in non-exchangeable K supply to crops has not been well examined in the WA grainbelt soils.…”

Section: Future Research Soil K-test Methodsmentioning

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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Section: Future Research Soil K-test Methodsmentioning

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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“…The low response in the "Medium" fertility ratings were unexpected and highlight the persistent uncertainty in fertilizer recommendations near recommended critical thresholds. These inconsistencies likely derive from bias during recommendation developments and the complexity of the dynamic soil-plant system (Fryer et al, 2019;Brouder et al, 2021). The uncertainty observed in regional P and K soil-tests involve complex interactions between environmental conditions, soil properties, and management practices.…”

Section: Evaluating Missouri Phosphorus and Potassium Fertilizer Reco...mentioning

confidence: 99%

“…This dataset includes over 20 soil types, with unique soil properties and response conditions to P and K fertilization, and likely contribute substantial unpredictability in the effectiveness of soil tests to estimate P and K crop supply during the growing season. These site-specific interactions are the principal justification for investigating multivariate approaches to improve current regional P and K recommendations in modern management systems (Fulford & Culman, 2018;Brouder et al, 2021).…”

Section: Evaluating Missouri Phosphorus and Potassium Fertilizer Reco...mentioning

confidence: 99%

“…Soil fertility analysis assesses physiochemical processes that govern labile P and K availability (Khan et al, 2014;Brouder et al, 2021) while soil health tests detect effects of management on soil biological properties . Their associated recommendations reflect these differences, with soil fertility tests informing fertilizer management while soil health tests inform soil and general cropping system practices.…”

Section: Integrating Soil Health Into Soil Fertility Recommendationsmentioning

confidence: 99%

“…Physiochemical, rather than biological, processes predominantly govern P and K nutrient supply to crops Brouder et al, 2021). These biological relationships are underdeveloped, but are hypothesized to be connected with P and K nutrient supply to crops through two processes: 1) estimating P and K mineralization from organic material, and 2) indirect effects on physiochemical processes that govern labile P and K availability.…”

Section: Integrating Soil Health Into Soil Fertility Recommendationsmentioning

confidence: 99%

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Utilization and limitations of soil health metrics in Missouri corn production decisions

Svedin¹

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Soil health benefits are widely acknowledged but empirically-vetted connections to agronomic outcomes remain absent. Therefore, recommendations for on-farm soil health assessments and interpretation remain ambiguous. Empirical connections to two major outcomes remain absent, specifically row crop productivity and fertilizer recommendations. This dissertation investigates potential benefits from incorporating soil health indicators with established phosphorus (P) and potassium (K) fertilizer recommendations, evaluates links between soil health indicators and corn grain productivity, and identifies optimal sampling depths and regional sensitivity to common conservation practices for seven unique soil health indicators. All results and conclusions derive from a dataset collected over three seasons (2018-2020) including 446 sample locations collected from 101 Mid-Missouri commercial row crop systems. Current P and K fertilizer recommendations accurately identified where fertilizer improved yield with 42 and 34 percent accuracy, respectively. No significant or measurable benefit occurred from incorporating soil health indicators with established P and K soil nutrient analysis when identifying nutrient deficiencies. Investigations into general productivity discovered an empirical relationship between potassium permanganate oxidizable carbon (or POXC) and grain yield. This relationship identified a POXC value of [greater than] 415 mg kg soil-1 where corn productivity was optimized. Further, POXC outperformed all other established soil analyses in predicting corn grain yield. Finally, regional sensitivity analysis of soil biological indicators of soil health identified important environmental and soil properties to consider when interpreting soil health assessments in Mid-Missouri. Recommendations were unique for each soil health assessment, with specific conservation practices and optimal sampling depth. In total, these results provide the needed groundwork connecting soil health with agronomic outcomes to support on-farm soil health interpretations.

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A review of the interaction between potassium nutrition and plant disease control

Ortel,

Roberts,

Rupe

2024

Agrosystems Geosci & Env

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Potassium (K) is an essential macronutrient involved in many physiological and biochemical functions that affect a plant's susceptibility to disease. These processes include stomatal regulation, enzyme activation, and solute transport, each of which is often discussed through the lens of either plant nutrition or plant disease control. However, the interaction between these stresses and the resulting physiological and agronomic impact is an important consideration when managing a cropping system as a whole and is scarcely addressed in the literature. Therefore, a review of the literature was focused on the interaction of K nutrition and the resulting impact on plant disease control. Nutrient management, especially K, can manipulate these essential plant processes to provide the host plant with either an advantage or disadvantage in disease susceptibility, depending on the pathogen and the situation. Numerous studies have been conducted investigating the individual pathogen and host relationships, concluding that the majority of bacterial and fungal diseases decreased with increasing K nutrition, while viral diseases and nematode infections had inconsistent responses to K nutrition. These differences in the response of disease to K nutrition complicate generalizations across species and environments. Similarly, the impact of K on plant growth is affected by the concentration of each nutrient and its ratio with other nutrients. Therefore, a review of the major physiological processes that depend on plant K nutrition is discussed below with the resulting impact on plant disease control.

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The Potassium Cycle and Its Relationship to Recommendation Development

Cited by 6 publications

References 120 publications

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

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

Utilization and limitations of soil health metrics in Missouri corn production decisions

A review of the interaction between potassium nutrition and plant disease control

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