المؤلفون: Stine Le Tougaard, Augusta Szameitat, Pauline Møs, Søren Husted

المصدر: Frontiers in Plant Science, Vol 14 (2023)

مصطلحات موضوعية: Solanum tuberosum, chlorophyll a fluorescence, phosphorus deficiency, nutrient remobilization, critical nutrient concentration, Plant culture, SB1-1110

الوصف: Phosphorus (P) deficiency is a global issue which can severely impact the yield of crops, including the P demanding and important food crop potato. Diagnosis of P status directly in the field can be used to adapt P fertilization strategies to the needs of the evolving crop during the growing season and is often estimated by analyzing P concentrations in leaf tissue. In this study, we investigate how diagnosis of P status in field grown potato plants is affected by leaf position and time of measurement in a randomized block experiment. The concentrations of many essential plant nutrients are highly dynamic, and large differences in nutrient concentrations were found in potato leaves depending on leaf age and time of sampling. During tuber initiation, P concentrations decreased in a steep gradient from the youngest leaves (0.8%) towards the oldest leaves (0.2%). The P concentrations in the youngest fully expanded leaf decreased by 25-33% within just 7 days, due to a high remobilization of P from source to sink tissue during crop development. 40 days later P concentrations in all leaves were near or below the established critical P concentration of 0.22%. The P concentration in leaf tissue thus depends on sampling time and leaf position on the plant, which in a practical setting might prevent a meaningful interpretation in terms of fertilizer recommendation. The chlorophyll a fluorescence parameter “P-predict”, derived from the fluorescence transients, is an alternative to the classical chemical analysis of nutrient concentrations in leaf tissue. P-predict values serve as a proxy for the bioavailable P pool in the leaf and can be measured directly in the field using handheld technology. However, in conditions of high solar irradiation, the P-predict values of the most light-exposed leaf positions, i.e. the younger leaves, were found to be severely impacted by photoinhibition, preventing accurate characterization of the P status in potatoes. Shading the plants can reverse or prevent photoinhibition and restore the diagnostic capabilities of the P-predict approach.

وصف الملف: electronic resource

العلاقة: https://www.frontiersin.org/articles/10.3389/fpls.2023.1100318/fullTest; https://doaj.org/toc/1664-462XTest

الوصول الحر: https://doaj.org/article/12fdf52f17b54429a051a5cacf0b86c3Test

المؤلفون: Quartieri M., Polidori G., Baldi E., Toselli M.

المساهمون: Quartieri M., Polidori G., Baldi E., Toselli M.

مصطلحات موضوعية: Diospyros kaki, fertilization, Kaki Tipo, macronutrient, nutrient remobilization, potassium, Rojo Brillante

الوصف: Persimmon is a typical fruit crop of the Mediterranean region and, since it is considered a minor species, little information is available on its nutrients need. In the present experiment, it was estimated the quantity of removed and recycled nutrients by Kaki Tipo and Rojo Brillante, the two main varieties of persimmon grown in Emilia-Romagna region (Po Valley, Italy). Plants from ten mature orchards were selected and harvested; organs (leaves in summer, fruits at harvest, abscissed leaves, roots and skeleton) biomass and mineral composition were determined. The yearly uptake of macronutrients was similar for the 2 varieties, accounting for (kg/ ha): N 89-91, P 10-11, K 79-91, Ca 132-162, Mg 22-26 and S 9. While K was mostly found in fruits, Ca and Mg were mainly partitioned to leaves. Among micronutrients, Mn and Fe showed the highest values (1.1–1.3 and 1.2–2.1 kg/ha, respectively), followed by B (370 g/ha), while Cu and Zn showed the smallest amounts (less 100 g/ha). Nitrogen, Ca, Mg and S were those more recycled than removed, while K showed an opposite trend; among the microelements, the annual recycled fractions of B and Mn were higher than that removed.

وصف الملف: ELETTRONICO

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000968381700001; volume:9; issue:3; firstpage:1; lastpage:11; numberofpages:11; journal:HORTICULTURAE; https://hdl.handle.net/11585/922402Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85151301891; https://www.mdpi.com/2311-7524/9/3/374Test

الإتاحة: https://doi.org/10.3390/horticulturae9030374Test
https://hdl.handle.net/11585/922402Test
https://www.mdpi.com/2311-7524/9/3/374Test

المؤلفون: Maurizio Quartieri, Greta Polidori, Elena Baldi, Moreno Toselli

المصدر: Horticulturae; Volume 9; Issue 3; Pages: 374

مصطلحات موضوعية: Diospyros kaki, fertilization, Kaki Tipo, macronutrients, nutrient remobilization, potassium, Rojo Brillante

جغرافية الموضوع: agris

الوصف: Persimmon is a typical fruit crop of the Mediterranean region and, since it is considered a minor species, little information is available on its nutrients need. In the present experiment, it was estimated the quantity of removed and recycled nutrients by Kaki Tipo and Rojo Brillante, the two main varieties of persimmon grown in Emilia-Romagna region (Po Valley, Italy). Plants from ten mature orchards were selected and harvested; organs (leaves in summer, fruits at harvest, abscissed leaves, roots and skeleton) biomass and mineral composition were determined. The yearly uptake of macronutrients was similar for the 2 varieties, accounting for (kg ha−1): N 89-91, P 10-11, K 79-91, Ca 132-162, Mg 22-26 and S 9. While K was mostly found in fruits, Ca and Mg were mainly partitioned to leaves. Among micronutrients, Mn and Fe showed the highest values (1.1–1.3 and 1.2–2.1 kg ha−1, respectively), followed by B (370 g ha−1), while Cu and Zn showed the smallest amounts (less 100 g ha−1). Nitrogen, Ca, Mg and S were those more recycled than removed, while K showed an opposite trend; among the microelements, the annual recycled fractions of B and Mn were higher than that removed.

وصف الملف: application/pdf

العلاقة: Plant Nutrition; https://dx.doi.org/10.3390/horticulturae9030374Test

الإتاحة: https://doi.org/10.3390/horticulturae9030374Test

المؤلفون: Baldi, Elena, Quartieri, Maurizio, Sorrenti, Giovambattista, Toselli, Moreno

المساهمون: Baldi, Elena, Quartieri, Maurizio, Sorrenti, Giovambattista, Toselli, Moreno

مصطلحات موضوعية: Prunus persica var. nucipersica, nutrient remobilization, macronutrient, micronutrient, compost

الوصف: Understanding nutrient dynamics within a peach orchard is fundamental to the development of accurate nutrient management practices. The present study investigated the nutrient uptake and redistribution in a 14-years-old commercial orchard in the Po valley. At the end of the experiment, trees were harvested, biomass and organ nutrient concentration were determined. Skeleton and roots accounted for the highest plant biomass, followed by fruits at harvest, pruned wood and abscised leaves; thinned fruits were less than 1 kg tree-1. The difference between the amounts of nutrients in leaves sampled in summer and in autumn (at abscission) was used to estimate the fraction of nutrients remobilized during the vegetative season inside the tree. The decrease of N, P, S, Cu, Mn and Zn concentration in abscised, compared to summer-sampled leaves was the result of the translocation of nutrients into fruits and storage organs. Nutrient circulation in a commercial nectarine orchard was calculated by determination of the fractions of each nutrient recycled (sum of nutrients in abscised leaves, thinned fruits and pruned wood) and remobilized (sum of nutrients in fruits at harvest, roots and skeleton). In our experimental conditions, on average, nectarine Stark RedGold showed an annual request of (in kg ha-1) 100, 17, 73, 129, 16, and 6 of N, P, K, Ca, Mg and S, respectively. More than half of these quantities were recycled in the orchard and returned back to the soil; consequently, if the nutrient use efficiency is maximized, the fertilization of nectarine requires only small amount of external inputs.

وصف الملف: STAMPA

العلاقة: volume:28; issue:3; firstpage:1; lastpage:12; numberofpages:12; journal:ITALUS HORTUS; https://hdl.handle.net/11585/849740Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85124136845; https://www.soihs.it/IH2/year_2021_volume_28_issue_3/evaluation_of_nutrients_removed_and_recycled_in_a_commerci.aspxTest

الإتاحة: https://doi.org/10.26353/j.itahort/2021.3.0112Test
https://hdl.handle.net/11585/849740Test
https://www.soihs.it/IH2/year_2021_volume_28_issue_3/evaluation_of_nutrients_removed_and_recycled_in_a_commerci.aspxTest

المؤلفون: Witold Grzebisz, Witold Szczepaniak, Stanisław Grześ

المصدر: Agronomy, Vol 10, Iss 626, p 626 (2020)

مصطلحات موضوعية: seed filling period, nutrient remobilization, nutrient post-flowering uptake, prognosis of yield components development, seed yield prognosis, Agriculture

الوصف: Nutrient management by winter oilseed rape (WOSR) during the seed filling period (SFP) is crucial for seed density (SD), which subsequently determines seed yield (Y). This hypothesis was evaluated based on data from field experiments (2008-2010), with six treatments with sequentially added nutrients (0, NP, NPK, NPKMgS1( 1 / 3 total MgS rate—spring applied), NPKMgS2 (total MgS rate autumn applied); NPKMgS3 ( 2 / 3 -autumn, 1 / 3 -spring). Nutrients accumulated in seeds were revealed as the most reliable WOSR trait, determining SD and Y. Yield was defined by the amounts of K and Mg in seeds. The amount nutrient remobilized from vegetative WOSR tissues was sufficient to cover the crop requirements during SFP for N, P, and Zn, but not for Ca, K, Mn, and Cu. The post-flowering K uptake resulted in PD, and SD increase, which subsequently resulted in a concomitant net uptake of Ca and Mg. The excessive accumulation of Ca, as well as Cu, and Mn in seeds due to a shortage of Mg, subsequently resulted in both SD and Y depression. The efficient exploitation of WOSR yielding potential as defined by SD, is possible, provided during the SFP reveals a net K and Mg uptake.

العلاقة: https://www.mdpi.com/2073-4395/10/5/626Test; https://doaj.org/toc/2073-4395Test; https://doaj.org/article/1e01d13807c74d769229ec72809dd2a4Test

الإتاحة: https://doi.org/10.3390/agronomy10050626Test
https://doaj.org/article/1e01d13807c74d769229ec72809dd2a4Test

المؤلفون: Millett, J., Millard, P., Hester, A. J., McDonald, A. J. S.

المصدر: The New Phytologist, 2005 Nov 01. 168(2), 413-422.

الوصول الحر: https://www.jstor.org/stable/3694549Test

المؤلفون: Milla, R., Castro-Díez, P., Maestro-Martínez, M., Montserrat-Martí, G.

المصدر: The New Phytologist, 2005 Oct 01. 168(1), 167-178.

الوصول الحر: https://www.jstor.org/stable/3694468Test

المؤلفون: Roman GEBAUER, Daniel VOLAŘÍK, Josef URBAN

المصدر: Journal of Forest Science, Vol 64, Iss 2, Pp 66-73 (2018)

مصطلحات موضوعية: active transport, leaf development, mistletoe-host interaction, nutrient relationships, nutrient remobilization, passive transport, Forestry, SD1-669.5

الوصف: The objectives of this research were to investigate nutrient seasonal dynamics in the hemiparasitic mistletoe Loranthus europaeus von Jacquin and its host Quercus pubescens Willdenow, and to evaluate nutrient relationships between mistletoe and its host. For these purposes, S, P and Mg concentrations in the leaves and current-year twigs were analysed 12 times during the growing season. We found that the studied nutrients were not retrieved from hemiparasitic mistletoe leaves prior to abscission, contrary to its host. The seasonal dynamics of S, P, and Mg in L. europaeus and Q. pubescens leaves differed from each other while in current-year twigs the dynamics was similar in both species. In general, nutrient concentrations in the leaves and current-year twigs were higher in mistletoe compared with its host. But the mistletoe to host nutrient ratios varied greatly during the growing season, especially in leaves, mostly during leaf expansion and senescence. Thus, studies investigating nutrient relationships between mistletoe and its host should be realized during the period of leaf maturity.

وصف الملف: electronic resource

العلاقة: https://jfs.agriculturejournals.cz/artkey/jfs-201802-0003_seasonal-variations-of-sulphur-phosphorus-and-magnesium-in-the-leaves-and-current-year-twigs-of-hemiparasitic.phpTest; https://doaj.org/toc/1212-4834Test; https://doaj.org/toc/1805-935XTest

الوصول الحر: https://doaj.org/article/1d92acb736fb4ae28f8cbf25b6eac186Test

المؤلفون: Proe, M. F., Midwood, A. J., Craig, J.

المصدر: The New Phytologist, 2000 Jun 01. 146(3), 461-469.

الوصول الحر: https://www.jstor.org/stable/2588928Test

المؤلفون: Gerdol R., Iacumin P., Brancaleoni L.

المساهمون: Gerdol, R., Iacumin, P., Brancaleoni, L.

مصطلحات موضوعية: altitude, bedrock, foliar chemistry, mineralization, mountain, nutrient remobilization, nutrient resorption efficiency, soil nutrient content

الوصف: Nutrient resorption from senescing leaves prior to litterfall is a strategy for nutrient conservation in vascular plants. However, the mechanisms through which soil fertility and/or foliar nutrient status affect nutrient resorption are not yet fully known. We used two 1,000-m-wide altitudinal gradients on two different bedrock types (carbonate and silicate) for analysing the interactive effects of temperature and soil chemistry on the resorption efficiency of two major nutrients, nitrogen (N) and phosphorus (P). Our objective was to assess how nutrient resorption varied across the gradients through the adaptation of individual species to changing environmental conditions rather than through changes in species composition. Both N and P resorption efficiency increased across the altitudinal gradients independent of bedrock type. The main process regulating nutrient resorption was a negative feedback to nutrient availability in the soil. The negative feedback of nutrient resorption efficiency to soil nutrient status was unrelated to total soil nutrient contents but depended on concentrations of organic N forms for nitrogen resorption efficiency (NRE) and on inorganic P forms for phosphorus resorption efficiency (PRE), respectively. While we hypothesized that the resorption of P, as a principally rock-derived nutrient, depended on physical–chemical processes affected by soil chemistry, our results showed that microbial P mineralization was the main source of inorganic P supply to the plants. Both NRE and PRE were effective to improve the growth potential of plants, but there was no evidence of stoichiometric adaptations of N:P RE-to-nutrient ratio in the soil. A plain language summary is available for this article.

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000509349600016; volume:33; issue:7; firstpage:1351; lastpage:1361; numberofpages:11; journal:FUNCTIONAL ECOLOGY; http://hdl.handle.net/11392/2414093Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85063530035; http://onlinelibrary.wiley.com/journal/10.1111Test/(ISSN)1365-2435

الإتاحة: https://doi.org/10.1111/1365-2435.13327Test
http://hdl.handle.net/11392/2414093Test