Vegetable Crops Prefer Different Ratios of Ammonium-N and Nitrate-N in the Growth Media

Nawarathna, K. K. K.; Dandeniya, W. S.; Dharmakeerthi, R. S.; Weerasinghe, P.

doi:10.4038/tar.v32i1.8445

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Given that, the interactive effects of K + and NH 4 + on plant growth and development became a focus of research (Witold et al, 2017;Shi et al, 2020a;Nawarathna et al, 2021;Aluko et al, 2022;Xiao et al, 2023). Excessive NH 4 + was found to limit growth and yield by reducing K + uptake and influx in wheat (Kong et al, 2014), Arabidopsis (Walch- Liu et al, 2000), rice (Szczerba et al, 2008) and tobacco (Lu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Efficient Nitrogen Fertilizer Management to Improve Crop Production

2024

Frontiers Research Topics

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Section: Introductionmentioning

confidence: 99%

Efficient Nitrogen Fertilizer Management to Improve Crop Production

2024

Frontiers Research Topics

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“…Given that, the interactive effects of K + and NH 4 + on plant growth and development became a focus of research ( Witold et al., 2017 ; Shi et al., 2020a ; Nawarathna et al., 2021 ; Aluko et al., 2022 ; Xiao et al., 2023 ). Excessive NH 4 + was found to limit growth and yield by reducing K + uptake and influx in wheat ( Kong et al., 2014 ), Arabidopsis ( Walch-Liu et al., 2000 ), rice ( Szczerba et al., 2008 ) and tobacco ( Lu et al., 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Determination of optimal NH4+/K + concentration and corresponding ratio critical for growth of tobacco seedlings in a hydroponic system

Aluko

Shi

et al. 2023

Front. Plant Sci.

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Inherently, ammonium (NH4+) is critical for plant growth; however, its toxicity suppresses potassium (K+) uptake and vice-versa. Hence, attaining a nutritional balance between these two ions (NH4+ and K+) becomes imperative for the growth of tobacco seedlings. Therefore, we conducted a 15-day experimental study on tobacco seedlings exposed to different concentrations (47 treatments) of NH4+/K+ at different corresponding 12 ratios simultaneously in a hydroponic system. Our study aimed at establishing the optimal NH4+-K+ concentration and the corresponding ratio required for optimal growth of different tobacco plant organs during the seedling stage. The controls were the baseline for comparison in this study. Plants with low or excessive NH4+-K+ concentration had leaf chlorosis or dark greenish colouration, stunted whole plant part biomass, and thin roots. We found that adequate K+ supply is a pragmatic way to mitigate NH4+-induced toxicity in tobacco plants. The optimal growth for tobacco leaf and root was attained at NH4+-K+ concentrations 2-2 mM (ratio 1:1), whereas stem growth was optimal at NH4+-K+ 1-2 mM (1:2). The study provided an insight into the right combination of NH4+/K+ that could mitigate or prevent NH4+ or K+ stress in the tobacco seedlings.

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Evaluating the nitrification inhibition potential of selected botanicals and their non-target effects

et al. 2022

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Nitrification inhibitors (NI) are aimed at improving N-fertilizer use efficiency in cropping systems. This study aimed to assess the nitrification inhibition potential and non-target effects of dry leaf powders (botanicals) of ten plant species [neem (Azadirachta indica), lantana (Lantana camara), karanda (Pongamia pinnata), Brachiaria humidicola, cinnamon (Cinnamomum verum), clove (Syzygium aromaticum), wild-sunflower (Tithonia diversifolia), mee (‎Madhuca longifolia), nutmeg (Myristica fragrans) and pepper (Piper nigram)]. The effect of botanicals on the growth of three ammonia oxidizing bacteria isolates (M4, M5 and M7) and NO3- formation in soil were tested in laboratory experiments. In a pot-experiment, botanicals were applied with urea to assess their effect on vegetative-growth of tomato and capsicum. The non-target effects of botanicals on soil bacteria and fungi, and seed germination were assessed separately. Dicyandiamide (DCD) was used as the positive control in all experiments. Only the growth of M7 was significantly suppressed by all botanicals except neem, Brachiaria and pepper. The highest shoot-biomass of tomato was obtained when urea was applied with pepper. Nitrate leaching from pots was significantly reduced (p<0.05) when urea was added with botanicals except for clove and wild-sunflower at basal-dressing. The abundance of culturable fungi and bacteria were not affected significantly by botanicals while seed germination was reduced significantly and consistently by clove only. From the ten botanicals tested leaf powders of nutmeg, lantana, cinnamon, mee, and pepper were identified as materials with better potential to suppress nitrification with minimum non-target effects.

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Vegetable Crops Prefer Different Ratios of Ammonium-N and Nitrate-N in the Growth Media

Cited by 3 publications

References 16 publications

Efficient Nitrogen Fertilizer Management to Improve Crop Production

Efficient Nitrogen Fertilizer Management to Improve Crop Production

Determination of optimal NH4+/K + concentration and corresponding ratio critical for growth of tobacco seedlings in a hydroponic system

Evaluating the nitrification inhibition potential of selected botanicals and their non-target effects

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