Sufficiency ranges for lemon balm and nutrient removals in aboveground phytomass

Rodrigues, M. Ângelo; Ferreira, I.Q.; Afonso, Sandra; Arrobas, Margarida

doi:10.1080/01904167.2018.1431671

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Boron is very important in dicots, where it plays an important role in cell wall and membrane integrity, with these plants requiring greater amounts of B than monocots [48][49][50]. In the region, dicots often respond to the application of B [12,41,51]. In this field trial, however, tissue B levels were never below the sufficiency range even though they were close to the limit.…”

Section: Discussionmentioning

confidence: 68%

“…Leaf P concentrations did not vary significantly with treatments and always remained within the sufficiency range established for this species (1.1 to 3.0%) [25,39]. Initial soil P levels were at a level classified as medium (Table 1), and in the region, it has been difficult to obtain a response of different crop species to P applications [5,40,41]. In chestnut, the lack of response may be due to those reasons but also to the buffering effect of the perennial parts, already mentioned for N, and to a possible role of mycorrhizal fungi.…”

Section: Discussionmentioning

confidence: 88%

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Large Chestnut Trees Did Not Respond to Annual Fertiliser Applications, Requiring a Long-Term Approach to Establishing Effective Fertilisation Plans

Arrobas

Silva²,

Busato

et al. 2023

Soil Systems

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Due to the high value of the fruit, the European chestnut (Castanea sativa Mill.), usually grown in agroforestry systems, has been planted as a single species in orchards managed with increasingly intensive cropping practices, such as the regular use of fertilisers. This justifies research into establishing fertilisation programmes oriented towards ecological intensification. In this study, the results of fruit production, plant nutritional status and soil properties are reported from a field trial in which three NPK fertilisers (20:7:10, 13:11:21 and 7:14:14) and a control treatment were used. Chestnut yields did not vary significantly between treatments, although the mean values of the control showed a clear downward trend. N supplied by the fertilisers seems to have been the most important factor in the difference between the fertilised and control treatments, since leaf N concentrations were lower in the control and often below the lower limit of the sufficiency range. Soil inorganic N levels in the autumn, and tissue N concentrations of the herbaceous vegetation developing beneath the trees, indicated risks of N loss to the environment and highlighted the importance of this vegetation remaining during the winter. The chestnuts’ poor response to fertiliser applications was attributed to the buffering effect of the large perennial structure of the trees on the distribution of nutrients to the growing plant parts. In large trees, it seems appropriate to base the annual fertilisation plan on leaf nutrient concentration. Thus, farmers probably should avoid spending money on fertilizer applications as long as leaf nutrient concentrations do not approach the lower limits of sufficiency ranges.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 88%

Large Chestnut Trees Did Not Respond to Annual Fertiliser Applications, Requiring a Long-Term Approach to Establishing Effective Fertilisation Plans

Arrobas

Silva²,

Busato

et al. 2023

Soil Systems

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“…Stieger and Feller (1994) reported a considerable increase in Mn and Fe contents in wheat plants growing in large pots under conditions of flooding. Pot experiments are often associated with high levels of Fe and Mn in plant tissues (Afonso et al 2018;Rodrigues et al 2018), probably due to the greater regularity of water supply and poor drainage that occur with plants grown in the field.…”

Section: Discussionmentioning

confidence: 99%

Soil and Plant Analyses to Diagnose Hop Fields Irregular Growth

Afonso

Arrobas

Rodrigues

2020

J Soil Sci Plant Nutr

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In cultivated fields, patches of poorly developed vegetation often appear without a clear indication of what is affecting the growth of the plants. The purpose of this study was to investigate the causes behind these irregularities in the hop (Humulus lupulus L.) fields of NE Portugal which are greatly reducing crop yield and farmers' profits and to provide guidance to farmers as to appropriate remedial action. Patches of different levels of plant development were selected within hop fields and categorized according to plant vigour (weak, fair and good). Several soil properties were determined and related to the plant nutritional status and dry matter yield of different parts of the plant (hops, leaves, stems). Data was subjected to analysis of variance and principal component analysis. The results suggest that crop yield is reduced mostly due to poor soil aeration and excessive soil and tissue Mn and Fe levels. The plants from the plots of weaker vigour seem to be particularly affected by toxic levels of Mn and the plants from the plots of fair vigour by Fe levels. pH, texture (clay content), cation exchange capacity and organic carbon seem to be other soil properties with some degree of influence on plant performance. From these results, farmers are advised to increase soil aeration by implementing a drainage system and converting to a drip irrigation system, in addition to increasing soil pH by liming to reduce Mn toxicity.

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Metalaxyl-M, phosphorous acid and potassium silicate applied as soil drenches show different chestnut seedling performance and protection against Phytophthora root rot

et al. 2021

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The application as soil drenches of three commercial products containing metalaxyl, phosphorous acid or potassium silicate, were studied as a means of controlling Phytophthora in chestnut (Castanea sativa Mill.) seedlings. In the metalaxyl treatment no plant deaths were recorded, whereas with the phosphorous acid and potassium silicate applications, and in the untreated control, the mortality rate was respectively 33.3, 44.4 and 77.8%. The presence of Phytophthora was detected in plants and soils at the end of the experiment which means that the three products did not eliminate the pathogen, and that they only gave temporary protection to the plant. In the treatments receiving metalaxyl or phosphorous acid, the plants showed a sharp drop in growth compared to the surviving plants of the control. Soil analyses revealed a high increase in exchangeable acidity, a high reduction in pH and a high increase in Mn levels in the soils treated with the products containing metalaxyl or phosphorous acid. In these treatments, elemental tissue analysis and nutrient recovery by plants revealed Mn levels far above the upper limit of the sufficiency range, with the toxicity of Mn being the suspected cause for the strong reduction in plant growth. These results indicate that when applying such products to the soil, their concentration and/or their ability to influence the soil pH should be evaluated and adequate measures of pH adjustment undertaken. In the case of phosphorous acid, its use can be replaced by phosphite salts. K-silicate did not show adverse effects on plant growth but provided less protection against Phytophthora than metalaxyl or phosphorous acid.

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Sufficiency ranges for lemon balm and nutrient removals in aboveground phytomass

Cited by 4 publications

References 37 publications

Large Chestnut Trees Did Not Respond to Annual Fertiliser Applications, Requiring a Long-Term Approach to Establishing Effective Fertilisation Plans

Large Chestnut Trees Did Not Respond to Annual Fertiliser Applications, Requiring a Long-Term Approach to Establishing Effective Fertilisation Plans

Soil and Plant Analyses to Diagnose Hop Fields Irregular Growth

Metalaxyl-M, phosphorous acid and potassium silicate applied as soil drenches show different chestnut seedling performance and protection against Phytophthora root rot

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