Diagnosis and prediction of deficiency and toxicity of nutrients

Bell, R.W.

doi:10.1016/b978-0-12-819773-8.00008-3

Cited by 3 publications

(2 citation statements)

References 88 publications

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“…In most countries, the optimum fertilizer dose and fertilization strategies are established by extension services, academic research, and fertilizer companies with the objective to maximize crop yield and profitability. These fertilizer recommendations (FR) are usually aided by plant (Izsaki 2009;Weetman and Wells 1990;Bell 2023) or soil diagnostics (van Heerwaarden 2022), using empirical algorithms that translate soil or plant nutrient concentrations into a desired nutrient dose in order to achieve the target crop yield. Both methods require insights into the relationship between concentrations in soils or plants and the corresponding growth and yield response curves, usually obtained in field experiments using different rates of fertilizers (Bell 2023).…”

Section: Introductionmentioning

confidence: 99%

“…These fertilizer recommendations (FR) are usually aided by plant (Izsaki 2009;Weetman and Wells 1990;Bell 2023) or soil diagnostics (van Heerwaarden 2022), using empirical algorithms that translate soil or plant nutrient concentrations into a desired nutrient dose in order to achieve the target crop yield. Both methods require insights into the relationship between concentrations in soils or plants and the corresponding growth and yield response curves, usually obtained in field experiments using different rates of fertilizers (Bell 2023). How soil-and plant-based methods will complement each other is currently under debate; however, sensor-derived estimates (of both) will certainly contribute to more tailor-made fertilizer practices that can match crop demand with the actual soil nutrient supply or availability.…”

Section: Introductionmentioning

confidence: 99%

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Options to reduce ranges in critical soil nutrient levels used in fertilizer recommendations by accounting for site conditions and methodology: A review

Siatwiinda,

Ros,

Yerokun

et al. 2024

Agron. Sustain. Dev.

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Fertilizer recommendations (FR) to improve yields and increase profitability are based on relationships between crop yields and soil nutrient levels measured via soil extraction methods. Within these FR, critical soil nutrient (CSN) levels are used to distinguish nutrient deficient from non-deficient soils. The variation in CSN levels is large, implying a risk of over- or under-fertilization. Here, we review and assess the factors influencing the derivation of CSN levels in order to increase both their reliability and applicability within FR systems. The evaluated factors included site conditions, i.e., crop type and location as a surrogate for climate and soil properties, and methodological factors, i.e., the experimental approach (field or pot experiments), and statistical methods and cut-off point. Results showed that the range of values used to define the medium soil fertility classes coincided with the range of CSN levels derived from experimental data. We show that harmonizing methodological aspects can substantially reduce the uncertainty in the CSN levels (> 50%), implying a substantial enhancement of the reliability of FR systems. Inclusion of site conditions might further improve the reliability. To enable reduction in CSN levels requires well-documented field experiments and standardization of data collection and analysis. We foresee the potential for generic FR systems that make use of reliable data, more process-based interpretation of nutrient pools and accounting for the interactions among nutrients.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Options to reduce ranges in critical soil nutrient levels used in fertilizer recommendations by accounting for site conditions and methodology: A review

Siatwiinda,

Ros,

Yerokun

et al. 2024

Agron. Sustain. Dev.

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Subsoil testing required to detect the rundown of soil potassium to deficient levels for wheat production on loam-textured soils

Scanlan,

Bell,

Cheng

et al. 2024

Crop & Pasture Science

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Context Long-term negative potassium (K) balances in crop production have depleted soil K levels in Western Australia (WA). Previous research has focussed on sand-textured soils, but recently, monitoring of crops grown on loam-textured soils has shown deficient or marginal shoot K concentrations where Colwell K 0–10 cm is above current critical levels. Aims The aims were to examine whether grain yield responses to fertiliser K can be detected on loam-textured soils and if soil test calibration curves can be identified for these soils. Methods Eight field trials were conducted with wheat on loam-textured soils. The same experimental design was used at all sites; six levels of K applied at sowing, from 0 to 200 kg K ha−1 with one treatment including a split application. Soil and plant test calibration curves were modelled using measurements from the trials. Key results Grain yield responses of 0.69 to 1.37 t ha−1 to fertiliser K (P < 0.05) occurred in 4 of 8 trials. Relative yield was closely related to soil exchangeable K and the goodness of fit of the soil test calibration curves increased as the depth of sampling increased. The best soil test calibration curve was for sampling 0–40 cm. Conclusions This research confirms that on some loam-textured soils, yield loss is occurring to K deficiency if no K fertiliser is applied. Implications As soil K reserves are run down, soil sampling at 0–40 cm on loam-textured soils will provide the most accurate monitoring of soil K deficiency for wheat production.

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Boron toxicity in young cassava plants

Silva

2024

Journal of Plant Nutrition

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Diagnosis and prediction of deficiency and toxicity of nutrients

Cited by 3 publications

References 88 publications

Options to reduce ranges in critical soil nutrient levels used in fertilizer recommendations by accounting for site conditions and methodology: A review

Options to reduce ranges in critical soil nutrient levels used in fertilizer recommendations by accounting for site conditions and methodology: A review

Subsoil testing required to detect the rundown of soil potassium to deficient levels for wheat production on loam-textured soils

Boron toxicity in young cassava plants

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