Root production and root mortality of winter wheat grown on sandy and loamy soils in different farming systems

Steingrobe, Bernd; Schmid, Harald; Gutser, R.; Claassen, N.

doi:10.1007/s003740000334

Cited by 37 publications

(27 citation statements)

References 25 publications

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“…The increased density of rhizosphere organisms in aphid treatments after spike emergence may reflect an enhanced growth of root decomposers at this stage in accordance with previous reports on increased root mortality at flowering (Cheng et al 1990;Steingrobe et al 2001b). We suggest that the herbivore stressed plants may give up their roots faster than uninfected plants when nutrient allocation to reproductive organs is more important than nutrient uptake.…”

Section: Discussionsupporting

confidence: 84%

Aphid effects on rhizosphere microorganisms and microfauna depend more on barley growth phase than on soil fertilization

2004

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This paper gives the first reports on aphid effects on rhizosphere organisms as influenced by soil nutrient status and plant development. Barley plants grown in pots fertilized with N but without P (N), with N and P (NP), or not fertilized (0) were sampled in the early growth phase (day 25), 1 week before and 1 week after spike emergence. Aphids were added 16 days before sampling was carried out. In a separate experiment belowground respiration was measured on N and NP fertilized plant-soil systems with aphid treatments comparable to the first experiment. Aphids reduced numbers of rhizosphere bacteria and fungal feeding nematodes 1 week before spike emergence. Before spike emergence, aphids reduced belowground respiration in NP treatments. These findings strongly indicate that aphids reduced allocation of photoassimilates to roots and deposition of root exudates in the growth phase of the plant. Contrary to this, 1 week after spike emergence numbers of bacteria, fungal feeding nematodes and Protozoa were higher in rhizospheres of plants subjected to aphids probably because aphids enhanced root mortality and root decomposition. Protozoa and bacterial feeding nematodes were stimulated at different experimental conditions with nematodes being the dominant bacterial grazers at N fertilization and Protozoa in the NP treatment before spike emergence.

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Section: Discussionsupporting

confidence: 84%

Aphid effects on rhizosphere microorganisms and microfauna depend more on barley growth phase than on soil fertilization

2004

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“…Asseng et al (1998) reported that the maximum wheat root length was 30 km m -2 , which was similar to the results obtained in the current study (Table 3), and comparable values in the RLD (El-Hafi d et al, 1998;Steingrobe et al, 2001a) and root length (Merrill et al, 1996;Steingrobe et al, 2001b) were also reported. On the other hand, Oyanagi et al (1998) reported a shorter root length than that obtained in our study, especially in soybean.…”

Section: Root Growthsupporting

confidence: 91%

Crop Production in Successive Wheat-Soybean Rotation with No-Tillage Practice in Relation to the Root System Development

Izumi

Uchida

Iijima

2004

Plant Production Science

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“…In general, roots exude organic substances, leading to the substantial accumulation of carbon in soils [5,6]. Moreover, root biomass produced during the plant growing period is expected to be far greater compared to standing roots for which dead roots are included in the same period [7,8]. Thus, the root biomass of plants, including dead roots and associated exudates, might provide sufficient organic matter for sustaining soil fertility.…”

Section: Introductionmentioning

confidence: 99%

Distribution and Quantity of Root Systems of Field-Grown Erianthus and Napier Grass

Sekiya¹,

Shiotsu²,

Abe³

et al. 2013

AJPS

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Cellulosic bioethanol produced from non-edible plants reduces potential food-fuel competition and, as such, is receiving increasing attention. In the raw material production of cellulosic bioethanol, the aboveground biomass of plants is entirely harvested; consequently, the plant roots represent the major source of organic matter incorporated into the soil. We selected Erianthus and Napier grass as the raw materials for cultivation in Asia. However, information about whether these 2 species provide sufficient root volume to sustain soil fertility is limited. Therefore, we examined the spatial distribution of the roots of these 2 plants, and quantified root mass and length. Erianthus and Napier grass were either grown in fields or greenhouses in Tokyo (Japan) and Lampung (Indonesia), and then their roots were exposed from adjacent soil profiles. Both species developed large, deep roots, penetrating 2.0 -2.6 m deep into the soil. Root depth indexes showed that the roots of both species penetrated much deeper into the soil compared to monocot crop species, being more comparable to dicot species. Erianthus developed a root mass and length of 384 -850 g·m −2 and 28.8 -35.8 km·m , respectively. These values exceeded the maximum values previously recorded for common crop species. Our study confirmed that Erianthus and Napier grass develop deep root systems, with substantially large biomass; hence, we suggest that both plants supply root biomass in large quantities, representing possible major sources of soil organic matter.

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Root production and root mortality of winter wheat grown on sandy and loamy soils in different farming systems

Cited by 37 publications

References 25 publications

Aphid effects on rhizosphere microorganisms and microfauna depend more on barley growth phase than on soil fertilization

Aphid effects on rhizosphere microorganisms and microfauna depend more on barley growth phase than on soil fertilization

Crop Production in Successive Wheat-Soybean Rotation with No-Tillage Practice in Relation to the Root System Development

Distribution and Quantity of Root Systems of Field-Grown Erianthus and Napier Grass

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