Root depth development in tropical perennial forage grasses is related to root angle, root diameter and leaf area

Huot, Chanthy; Zhou, Yi; Philp, Joshua; Denton, Matthew D.

doi:10.1007/s11104-020-04701-2

Cited by 17 publications

(10 citation statements)

References 57 publications

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“…In addition, pastures demonstrated excellent regrowth vigor and high forage accumulation despite the PR values that could be impeding the pastures' development. Compaction reduces soil pores when larger pores are lost or reduced in size (42) ; however, grasses seem to adjust the diameter of their roots to fill porous spaces in their search for water and nutrients (43) . The roots' elongation during this search thus seems to have a soil unpacking function during the pastures' regrowth, justifying the absence of N's effect on the soil's PR in the pre-grazing period.…”

Section: Discussionmentioning

confidence: 99%

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

Sousa

Montagner

Araújo

et al. 2022

Rev. Mex. Cienc. Pecu.

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This work aimed to evaluate the effects of three nitrogen (N) doses on the morphogenic and structural characteristics, root mass (RM) and distribution in the soil profile, and penetration soil resistance of Mombasa guineagrass pastures managed with rotational stocking. The experimental design used randomized blocks with three N doses (100, 200, and 300 kg ha-1) and three replicates. The criterion for interrupting the pastures’ regrowth was the height of 80 to 90 cm of the canopy (90–95 % of light interception by the canopy). The animals were removed from the paddocks when the canopy reached 50 % of the pre-grazing height. Forage mass and accumulation, canopy morphogenic and structural characteristics, RM and distribution in the soil profile, and soil resistance to penetration were evaluated. In pastures fertilized with 200 and 300 kg ha-1 of N, the highest leaf appearance (0.090 and 0.081 leaves-1 tiller-1 d-1), elongation rates (2.82 and 2.61 cm tiller-1 d-1) and highest daily forage accumulation (113.8 and 106.6 kg ha-1d-1) were observed. Using 300 kg ha-1 of N promoted greater soil resistance to penetration at 10 cm of depth in the post-grazing (3.3 MPa). No effect of N doses was observed for RM (P>0.05). The pre- and post-grazing height control of animals in the paddocks therefore helped to maintain the pasture structure and avoid the soil compaction process. According to the results, it is concluded that 200 and 300 kg ha-1 of N fertilization is a strategy for intensifying pastures.

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Section: Discussionmentioning

confidence: 99%

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

Sousa

Montagner

Araújo

et al. 2022

Rev. Mex. Cienc. Pecu.

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“…Estudos relatam que em profundidades superiores a 40 cm, plantas de Brachiaria sp. apresentam crescimento agressivo e grande volume de rizosfera, esses fatores contribuem para redução da densidade do solo e aumento da macroporosidade (LOUW-GAUME et al, 2017;HUOT et al, 2020).…”

Section: Discussionunclassified

“…Registrou-se para COS e ECOS, baixa correlação com os demais atributos analisados (Figura 8). Sabe-se que o carbono influencia na qualidade do solo, principalmente na formação de agregados (ZHOU et al, 2020). Comparando-se os resultados, observou-se que COS e ECOS seguiram o seguinte comportamento: floresta nativa> pastagem> plantio de paricá (Figura 10).…”

Section: Discussionunclassified

VARIAÇÃO ESPACIAL DOS ATRIBUTOS FÍSICOS E ESTOQUES DE CARBONO DO SOLO EM PLANTIO DE Schizolobium amazonicum NA AMAZÔNIA

Ataides

Neves²,

Santos³

et al. 2022

NAT

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Plantios de árvores proporcionam aumento dos estoques de carbono do solo, mas estudos envolvendo espécies nativas da Amazônia são incipientes. Objetivou-se avaliar a variação espacial dos atributos físicos e estoque de carbono orgânico no solo em plantio de paricá. Na área de estudo, coletaram-se amostras de solo nas profundidades de 0 a 20 cm e de 20 a 40 cm e os parâmetros analisados foram: textura do solo, macroporosidade, microporosidade, densidade aparente do solo, resistência mecânica do solo à penetração, teores e os estoques de carbono orgânico do solo. Interpolou-se os dados pelo inverso do quadrado da distância. A variação espacial dos atributos físicos do solo no plantio foi influenciada pela textura. Houve baixa amplitude da variação espacial dos teores e estoques de carbono orgânico do solo. O plantio de paricá apresentou eficiência na fixação de carbono no solo em profundidade. Palavras-chave: silvicultura; sequestro de carbono; física do solo; mudança climática. Spatial variation of physical attributes and soil carbon stocks in a Schizolobium amazonicum plantation in the amazon ABSTRACT: Tree plantations provide an increase in soil carbon stocks, but studies involving native Amazonian species are incipient. The objective was to evaluate the spatial variation of physical attributes and soil organic carbon stock in a paricá plantation. In the study area, soil samples were collected at depths of 0 to 20 cm and 20 to 40 cm and the parameters analyzed were: soil texture, macroporosity, microporosity, soil bulk density, mechanical soil resistance to penetration, and soil organic carbon content and stocks. The data were interpolated by the inverse of the square of the distance. The spatial variation of soil physical attributes at planting was influenced by texture. There was a low range of spatial variation in soil organic carbon content and stocks. Paricá planting was efficient in fixing soil carbon at depth. Keywords: silviculture; carbon sequestration; soil physics; climate change.

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“…The reduction in macro and micronutrient content of eucalyptus plants in competition with M. maximus is due to the fact that this grass requires a greater amount of nutrients for shoot growth [42,43] and, with Urochloa spp., due to the efficiency of their roots in absorbing nutrients [44]. Moreover, M. maximus, U. brizantha, and U. decumbens consume resources beyond the limiting amount for their growth [45], and the association with mycorrhiza favors this consumption [46][47][48].…”

Section: Relative Nutrient Contentmentioning

confidence: 99%

“…The lower efficiency of N, P, and K uptake of the eucalyptus clonal hybrid in competition with U. decumbens is due to the root system of the weed developing at large angles, better exploring the soil horizontally [44]. Furthermore, considering the pH range adopted (5.0), U. decumbens roots absorb more nutrients than M. maximus and U. brizantha [49].…”

Section: Nutritional Efficiencymentioning

confidence: 99%

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

Maciel

Duque

Ferreira

et al. 2022

Forests

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Invasive grasses reduce resource availability, mainly nutrients in the soil, and the growth of eucalyptus plants. Efficient management to increase productivity depends on understanding levels of weed interference in eucalyptus plantations. The nutritional efficiency of eucalyptus plants in competition has been evaluated by plant tissue analysis. The objective was to evaluate the growth, relative accumulation of nutrients, and nutritional efficiency of the eucalyptus clonal hybrid I144 (Eucalyptus urophylla × Eucalyptus grandis), in competition with Megathyrsus maximus cv. BRS zuri, Urochloa brizantha cv. marandu, Urochloa decumbens cv. basilisk and in the control (eucalyptus plants without weed competition). The experiment was carried out with a completely randomized design, with four treatments and ten replications. The height, stem diameter, number of leaves, leaf area, dry matter of leaves and stem, nutrient content in leaves and uptake, transport, and N, P, and K utilization efficiency of the eucalyptus clonal hybrid were evaluated at 110 days after transplantation. The growth parameters and relative contents of macro and micronutrients in the eucalyptus clonal hybrid were lower in competition with M. maximus, U. brizantha and U. decumbens. The efficiency of N, P, and K uptake and transport by the eucalyptus clonal hybrid was 29.41 and 7.32% lower in competition with U. decumbens than in the control treatments, respectively. The efficiency of N, P, and K utilization by eucalypts was 13.73, 9.18, and 22.54% lower in competition with M. maximus, U. brizantha, and U. decumbens, respectively. The reduced growth and nutritional parameters of the eucalyptus clonal hybrid were more evident in competition with U. decumbens. Plant tissue analyses efficiently determined the level of competition for nutrients between species. Crop competition with grasses can decrease the efficiency and use of nutrients, which consequently reduces plant development and productivity.

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Root depth development in tropical perennial forage grasses is related to root angle, root diameter and leaf area

Cited by 17 publications

References 57 publications

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

VARIAÇÃO ESPACIAL DOS ATRIBUTOS FÍSICOS E ESTOQUES DE CARBONO DO SOLO EM PLANTIO DE Schizolobium amazonicum NA AMAZÔNIA

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

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