Effects of humic acid on photosynthetic efficiency of rapeseed plants growing under different watering conditions

Lotfi, Ramin; Kalaji, Hazem M.; Valizadeh, G R; Behrozyar, Ebrahim Khalilvand; Hemati, Arash; Gharavi-Kochebagh, P.; Ghassemi, Amirreza

doi:10.1007/s11099-017-0745-9

Cited by 79 publications

(52 citation statements)

References 58 publications

(49 reference statements)

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“…Fulvic acid spraying improved the Fv/Fm ratio under both watering regimes (Figure 4). These results are similar to those obtained by Lotfi et al (2018), who also reported that FA spraying improves Fv/Fm and the performance index of rapeseed plants under WD and WW conditions. It also increased photosynthesis.…”

Section: Discussionsupporting

confidence: 91%

Co-application of soil superabsorbent polymer and foliar fulvic acid to increase tolerance to water deficit maize: photosynthesis, water parameters, and proline

Yang

Guo

et al. 2019

Chil. j. agric. res.

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Fulvic acid (FA) and superabsorbent polymer (SAP) are widely applied to improve crop growth and yield under water deficit conditions, but little is known about the changes in crop physiological parameters related to water deficit tolerance when SAP and FA are combined. A pot test with maize (Zea mays L.) plants was conducted to examine the combined effect on photosynthesis, leaf water, proline, and growth under soil water deficit. Maize plants were subjected to two soil moisture conditions at the late crop growth phase: water deficit (WD, 50% field capacity) and well-watered (WW, 80% field capacity). The SAP (4.5 g m-2) was mixed into the soil layer at sowing and the FA solution (2 g L-1) was sprayed twice during water control. The combined application significantly improved maize grain yield under both watering conditions. The net photosynthesis rate, intrinsic quantum yield, fluorescent parameter (Fv/Fm), and chlorophyll content all improved with the combined application under both watering regimes. The compensating effect of combining chemicals on yield and photosynthesis parameters was higher than when applied alone under the two watering conditions. For prolonged and WD conditions, leaf proline and water content were higher under the combined treatment than when used separately. Under the WD conditions treated with FA and SAP, Fv/Fm had positive significant correlations with leaf water content and osmotic potential; leaf proline did not show any correlations with either the osmotic potential or leaf water content. This result demonstrated that SAP and FA could be combined to maintain high leaf proline and improve photosynthesis to mitigate adverse effects of moderate water storage on maize growth.

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Section: Discussionsupporting

confidence: 91%

Co-application of soil superabsorbent polymer and foliar fulvic acid to increase tolerance to water deficit maize: photosynthesis, water parameters, and proline

Yang

Guo

et al. 2019

Chil. j. agric. res.

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“…However, a proportion of this energy is released in the form of heat and fluorescence. When the electron transport in the photosynthetic system is partially or completely blocked due to a stress factor, the emitted fluorescence intensity increases, reflecting less use of photosynthetically active radiation by plants [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Early Identification of Herbicide Modes of Action by the Use of Chlorophyll Fluorescence Measurements

Hassannejad

Lotfi

Ghafarbi

et al. 2020

Plants

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The effect of seven herbicides (U-46 Combi Fluid, Cruz, MR, Basagran Bromicide, Lumax, and Gramoxone) on Xanthium strumarium plants was studied. Chlorophyll content and fluorescence, leaf temperature, and stomatal conductance were evaluated at 12 h, 36 h, 60 h, and 84 h after herbicides application. U46 Combi Fluid, Cruz, and MR did not have a significant effect on chlorophyll fluorescence induction curves as compared to the control treatment. However, Basagran, Bromicide, Lumax, and Gramoxone showed significant changes in the shape of polyphasic fluorescence transients (OJIP transients). Variations in chlorophyll content index, leaf temperature, and stomatal conductance parameters were dependent on the type of applied herbicide. Our study revealed that the specific impact of the applied herbicides on the photosynthetic efficiency of plants is related to their chemical groups and their mechanism of action.

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“…Thus, the photosynthetic efficiency readings collected in the most mature period (60 days PE) showed that the treatments presenting significant differences between control were much closer to the optimal/non-stress threshold. Lotfi et al (2018) tested the effects of HA on photosynthetic efficiency of rapeseed (Brassica napus subsp. napus) plants in different water regimes and the application of HA resulted in increased maximum quantum yield of PSII photochemistry (F v /F m ), where the highest discrepancy between non-humic acid and HA treatments appeared in response to the most severe water stress.…”

Section: Plant Heightmentioning

confidence: 99%

Corn Response to an Integrated Plant Nutrition System (IPNS) With Humic Acid and Biofertilizers

Filho¹,

Thomason²,

Evanylo³

et al. 2020

JAS

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Sustainable agriculture production depends on the development of methods that optimize nutrient cycling, minimize use of external inputs, and maximize input use efficiency according to the conditions of each region. The principle of an integrated plant nutrition system (IPNS) is to tailor plant nutrition and soil fertility management, taking advantage of the combined and harmonious use of inorganic, organic and biological resources. This greenhouse study investigated the individual and combined use of inorganic, organic and biological fertilizer resources for corn (Zea mays L.). We evaluated the effects of commercial synthetic fertilizer, humic acid products, compost/manure teas and bioinoculant as inorganic, organic and biological resources, respectively, and their synergy on corn growth and soil respiration parameters under a period of water stress. The pots were laid out in completely randomized design and the total of sixteen treatment combinations were replicated four times. In general, when comparing to the control values, the use of humic acid (HA), biofertilizers and the integration of both compounds generated significantly greater early season plant height, chlorophyll content, photosynthetic efficiency and shoot/root dry biomass. The soil substrate induced respiration was affected by only one biofertilizer product at two different rates. Though all pots received adequate synthetic fertilizer, the control plants were generally smaller and less vigorous compared to the plants receiving either HA or biofertilizer treatments, but no additive benefit was observed for the integrated practice compared to individual applications. Further studies addressing different types and levels of stress along with greater stress duration should be conducted to validate these findings.

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Effects of humic acid on photosynthetic efficiency of rapeseed plants growing under different watering conditions

Cited by 79 publications

References 58 publications

Co-application of soil superabsorbent polymer and foliar fulvic acid to increase tolerance to water deficit maize: photosynthesis, water parameters, and proline

Co-application of soil superabsorbent polymer and foliar fulvic acid to increase tolerance to water deficit maize: photosynthesis, water parameters, and proline

Early Identification of Herbicide Modes of Action by the Use of Chlorophyll Fluorescence Measurements

Corn Response to an Integrated Plant Nutrition System (IPNS) With Humic Acid and Biofertilizers

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