Tag Archives: root system

52–89 Y. Tsytsiura, T. Zabarna and S. Amons
The role of oilseed radish root mass in assessing the efficiency of green manuring systems
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The role of oilseed radish root mass in assessing the efficiency of green manuring systems

Y. Tsytsiura*, T. Zabarna and S. Amons

Faculty of Agronomy, Horticulture and Plant Protection Vinnytsia National Agrarian University, Soniachna Street, 3, UA21008 Vinnytsia, Ukraine
*Correspondence: yaroslavtsytsyura@ukr.net

Abstract:

This study provides an integrated evaluation of oilseed radish root mass in the context of its use as a long-term green manure. Under conditions characterised by optimal hydrothermal regimes, the crop exhibited a pronounced capacity for root mass accumulation, reaching 13.28 t ha⁻¹ (2.71 t ha⁻¹ in dry matter (DM)) under spring sowing conditions and 8.03 t ha⁻¹ (1.76 t ha⁻¹ in dry matter) under summer sowing conditions. The corresponding mean root-system productivity coefficients were 1.86 and 2.49, respectively. Analysis of the biochemical composition of root residues, averaged across sowing periods, revealed relatively low nitrogen levels (1.45% DM) alongside elevated carbon content (40.29% DM). The residues were additionally characterised by elevated concentrations of crude fat (2.07% DM) and crude fibre (42.7% DM), as well as a notable presence of glucosinolates (17.79 μmoles g⁻¹ DM), with ash content averaging 6.26% DM. Statistical analysis indicated that the variability of these biochemical parameters was moderately associated with thermal conditions, with coefficients of determination ranging from 23% to 44% in relation to mean daily air temperature, whereas precipitation showed an inverse relationship (25–49%). Based on the calculated biochemical ratios, the root mass can be classified as a material with the maximum achievable fertilizer potential (kg ha-1 active ingredient) N34.7P11.6K89.8Ca11.7S16.6. At the same time, its relatively high carbon and fibre contents indicate a potentially slow mineralisation pattern. These results demonstrate that root biomass should be explicitly incorporated into assessments of green-manure efficiency, as its contribution extends beyond aboveground biomass and includes both nutrient inputs and longer-term carbon and biologically active compound inputs to the soil.

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2060-2068 I. Kakabouki, A. Folina, S. Karydogianni, Ch. Zisi and A. Efthimiadou
The effect of nitrogen fertilization on root characteristics of Camelina sativa L. in greenhouse pots
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The effect of nitrogen fertilization on root characteristics of Camelina sativa L. in greenhouse pots

I. Kakabouki¹*, A. Folina¹, S. Karydogianni¹, Ch. Zisi¹ and A. Efthimiadou²

¹Agricultural University of Athens, Department of Crop Science, Laboratory of Agronomy, 75 Iera Odos Str., GR11855 Athens, Greece
²Institute of Soil and Water Resources, Department of Soil Science of Athens, Hellenic Agricultural Organization-DEMETER, Sofokli Venizelou 1, GR14123 Lycovrissi, Attica, Greece
*Correspondence: i.kakabouki@gmail.com

Abstract:

Climate change has made mandatory the introduction of new crops in Greece, such as the cultivation of camelina [Camelina sativa (L.) Crantz]. Nitrogen (N) and the development of root system are two important factors affecting crop growth and yield. Camelina has been studied mainly for its composition and oil. In the present study, root development of camelina crop was thoroughly investigated; mainly in terms of Nitrogen fertilization. Therefore, a camelina greenhouse experiment was established in Western Greece, in the region of Agrinio, in March 2019 in completely randomized design with four treatments, (control 0 ppm N, 30 ppm N, 60, ppm N and 90 ppm N). The N rates had statistically significant affected root density and root surface from 40 to 120 days after treatment (DAT) with highest values at 100 DAT and 90 ppm N, 52.54 cm of root 100 cm-3 and 27.59 cm2 of root 100 cm-3, respectively. The root volume was significantly affected by N fertilizer from 40 to 100 DAT and highest value was 13.18 cm3 of root 100 cm-3 soil in the 90 ppm at 120 DAT. The plant leaf area was significantly affected by the highest rate of N. Yield per plant had not statistically significant difference with the 60 and with the 90 and highest weight per plant 292.25 g plant-1 in 90 ppm. In conclusion, Ν fertilization significantly affected growth or camelina’s root system after 40 DAT. Plant growth was significantly affected by fertilization and the highest yield and 1,000 seed weight were recorded with the highest amount of N.

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31-42 A.B. Gorbunov and К.V. Brik
Peculiarities of rooting ability and formation of Ribes atropurpureum root system on treatment of grafts with growth regulators
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Peculiarities of rooting ability and formation of Ribes atropurpureum root system on treatment of grafts with growth regulators

A.B. Gorbunov¹ and К.V. Brik²

¹Central Siberian Botanical Garden, SB RAS, Zolotodolinskaya st. 101,630090 Novosibirsk, Russia; e-mail: gab_2002ru@yahoo.ca
²Novosibirsk State Agricultural University, Dobrolyubova st. 160,630039, Novosibirsk, Russia; e-mail: rector@nsau.edu.ru

Abstract:

The data on the rooting ability and peculiarities of root system formation of hard-wood and soft-wood cuttings of Ribes atropurpureum under the action of growth regulators are presented. The positive influence of humat potassium, tellura-M, and phoenix in the concentration of 0.5–1% on branching and root length of different orders of ramification in hard-wood and soft-wood cuttings was established. Hard-wood cuttings formed longer roots of orders I and II of ramification, but branching was poorer than that in soft-wood cuttings.

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