Photosynthetic Nutrient and Water Use Efficiency of Cucumis sativus under Contrasting Soil Nutrient and Lignosulfonate Levels

Ikkonen, Elena; Chazhengina, Svetlana; Jurkevich, Marija

doi:10.3390/plants10020340

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…There are contradictory opinions concerning its possible functioning as an HP. Some publications report a positive role of LS in crop growth [16][17][18][19][20], whereas others consider it as a "fake" HP that can serve only as a stabilizer of HP solutions with a minor effect on plant growth [21,22]. However, by all means, LS is a valuable organic raw material, sharing similar properties with humic substances in terms of an aromatic core with carboxylic and phenolic functional groups.…”

Section: Introductionmentioning

confidence: 99%

Formation of Humic-Like Substances during the Technological Process of Lignohumate® Synthesis as a Function of Time

et al. 2021

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The composition, structure, and biological activity of humic-like substances (HLS) synthesized in the process of lignosulfonate conversion for the production of the humic product Lignohumate® (LH) were examined. It is shown that during the hydrolytic-oxidative process, the transformation of raw material and accumulation of HLS occur. Data on the chemical (elemental content, functional groups, FTIR) and spectral (absorbance and fluorescence) parameters and biological activity (in phytotest) combined with PCA show that the LH samples can be divided into three groups, depending on the duration of synthesis: initial raw material (0-time sample); “young” HLS (15–30 min), and “mature” HLS in 45–120 min of treatment. During the first 30 min, reactions similar to the ones that occur during lignin humification in nature take place: depolymerization, oxidative carboxylation, and further polycondensation with the formation and accumulation of HLS. After 45–60 min, the share of HLS reaches a maximum, and its composition stabilizes. Biological activity reaches a maximum after 45–60 min of treatment, and at that stage, the further synthesis process can be stopped. Further processing (up to 2 h and more) does not provide any added value to the humic product.

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Section: Introductionmentioning

confidence: 99%

Formation of Humic-Like Substances during the Technological Process of Lignohumate® Synthesis as a Function of Time

et al. 2021

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“…The sandy loam soil used for this pot experiment was collected randomly from the topsoil layer in the northwest region of Russia (61.826573, 33.179712). The collected soil is characterized by a low natural fertility, low water holding capacity, and low pH (5.46) and humus content (0.5–2.5%), and had 0.39% of total N and 1.6 g kg −1 of available P and K [ 41 ]. The available Pb content of collected soil was 0.13 ± 0.01 mg kg −1 .…”

Section: Methodsmentioning

confidence: 99%

Effect of Secondary Paper Sludge on Physiological Traits of Lactuca sativa L. under Heavy-Metal Stress

Yurkevich,

Kurbatov,

Ikkonen

2024

Plants

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To eliminate the negative effect of soil contamination with heavy metals on plant growth and crop yield, different methods and techniques are the subject of discussion and study. In this study, we aimed to evaluate the effect of secondary pulp and paper-mill sludge application to soil on the response of the main physiological processes such as the growth, photosynthesis, and respiration of lettuce (Lactuca sativa L.) plants to soil contamination with Pb. For the pot experiment, Pb was added to sandy loam soil at concentrations of 0, 50, and 250 mg Pb(NO3)2 per kg of the soil, and secondary sludge was added to a 0, 20, or 40% sludge solution during each plant watering. The Pb-mediated change in plant biomass allocation, decrease in the photosynthetic rate, increase in leaf respiration rate, and the degree of light inhibition of respiration were closely associated with increases in both root and shoot Pb content. For the Pb-free soil condition, secondary sludge application contributed to the allocation of plant biomass towards a greater accumulation in the shoots than in the roots. Although stomatal opening was not affected by either Pb or sludge, sludge application increased photosynthetic CO2 assimilation regardless of soil Pb content, which was associated with an increase in the electron-transport rate and carboxylase activity of Rubisco. Soil contamination with Pb significantly increased the ratio of respiration to photosynthesis, reflecting a shift in the carbon balance toward carbon losses in the leaves, but sludge application modified the coupling between the processes with a decrease in the proportion of respiratory carbon losses. The sludge-mediated recovery of the physiological processes of L. sativa reflected an increase in plant tolerance to soil contamination with heavy metals, the formation of which is associated with plant and soil adjustments initiated by secondary sludge application.

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“…According to Gael and Smirnova [32], this soil typically is characterized by low natural fertility with a humus content of 0.5-2.5%, as well as low water-holding capacity. The soil had 1.6 g kg −1 of total N, 0.1 g kg −1 of available P and K, 0.8 g kg −1 of Mg and Ca, and a pH value of 5.46 [33].…”

Section: Pot Experiments Installationmentioning

confidence: 99%

Physical Properties of Retisol under Secondary Pulp and Paper Sludge Application

Butylkina,

Ikkonen

2023

Land

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A positive effect of pulp and paper mill sludges as a rich source of organic substrates on soil properties was previously found for some types of sludge and soil. In this study, the effect of secondary pulp and paper sludge on water characteristics and thermal properties of Retisol, as well as the growth parameters of lettuce (Lactuca sativa L.), was tested on the basis of a pot experiment when watering plants with a 20 or 40% sludge solution. The sludge application enhanced plant growth with an increase in biomass accumulation of 21 and 53%, respectively, for 20 and 40% sludge treatments. When the sludge dose was increased from 0 to 40%, the number of leaves increased by 25%, and the leaf mass per area value increased by 42%. Due to the accumulation of more biomass in the shoots than in the roots, sludge causes a change in the allocation of plant biomass. A significant effect of the sludge application on soil particle and microaggregate sized compositions, as well as on the saturated soil hydraulic conductivity, was not found in this study. However, fitted soil water retention curves showed an increased soil water content in sludge-treated soil at all water content values exceeding field capacity. Secondary sludge application led to an increase in the saturated water content from 0.50 to 0.56 cm3 cm−3. The 40% sludge solution increased soil thermal conductivity from 0.92 to 0.98 W m−1 K−1 under saturated water content and from 0.83 to 0.92 W m−1 K−1 under field capacity. The thermal conductivity was higher in the sludge-treated than untreated soil due to a more pronounced positive effect of increased saturated water content than the negative effect of the increased organic matter content on heat transfer. The positive impact of secondary sludge application on both plant growth parameters and physical properties of Retisol, such as increased soil water-holding capacity and thermal conductivity coefficient confirms the possibility of using it to improve soil characteristics and plant productivity.

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Photosynthetic Nutrient and Water Use Efficiency of Cucumis sativus under Contrasting Soil Nutrient and Lignosulfonate Levels

Cited by 11 publications

References 42 publications

Formation of Humic-Like Substances during the Technological Process of Lignohumate® Synthesis as a Function of Time

Formation of Humic-Like Substances during the Technological Process of Lignohumate® Synthesis as a Function of Time

Effect of Secondary Paper Sludge on Physiological Traits of Lactuca sativa L. under Heavy-Metal Stress

Physical Properties of Retisol under Secondary Pulp and Paper Sludge Application

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