Steingrobe, Bernd

[["dc.bibliographiccitation.firstpage","143"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Agronomy"],["dc.bibliographiccitation.lastpage","151"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Steingrobe, B."],["dc.contributor.author","Schmid, H."],["dc.contributor.author","Claassen, N."],["dc.date.accessioned","2018-11-07T08:34:24Z"],["dc.date.available","2018-11-07T08:34:24Z"],["dc.date.issued","2001"],["dc.description.abstract","To measure root production by the ingrowth core method mesh bags filled with root-free soil are buried into the root zone of plants. After a time period which should be shorter than the lifespan of the roots the mesh bags are pulled out and root length inside the cores is determined. A major objection against this method is a possible alteration of root growth pattern induced by root injuries or soil disturbances that occur during the insertion of the mesh bags into the soil. Root length density (RLD) in the mesh bags was between 0.7 and 5.0 cm cm(-3) after 14 days of ingrowth of wheat or barley roots depending on soil type or plant age. RLD in the bulk soil next to the mesh bags was between 7.7 and 14.8 cm cm(-3) in the 0-30 cm soil depth. Different time periods between inserting the mesh bags and opening them for root ingrowth in which the installation disturbance could settle, had no effect on RLD in the ingrowth cores. There were also no differences in RLD in the direct vicinity around the ingrowth cores and the bulk soil, which was tested by counting roots at profile walls adjacent to the mesh bags and by taking soil samples around the cores with an auger. The conclusion of these results was that no alteration of root growth pattern occurred in or around the ingrowth cores due to the installation of the mesh bags. However, further investigations are necessary to validate this method as a reliable and easy field method for measuring root growth. (C) 2001 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S1161-0301(01)00100-9"],["dc.identifier.isi","000172061700006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17803"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1161-0301"],["dc.title","The use of the ingrowth core method for measuring root production of arable crops - influence of soil and root disturbance during installation of the bags on root ingrowth into the cores"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","239"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","248"],["dc.bibliographiccitation.volume","237"],["dc.contributor.author","Steingrobe, B."],["dc.contributor.author","Schmid, H."],["dc.contributor.author","Claassen, N."],["dc.date.accessioned","2018-11-07T11:22:26Z"],["dc.date.available","2018-11-07T11:22:26Z"],["dc.date.issued","2001"],["dc.description.abstract","Winter barley was grown in a long-term fertilizer experiment (14 years) using two P treatments: (i) no P fertilization over the whole time (-P) and (ii) an annual fertilization of 44 kg P ha(-1) (+P). The objective of the study was to investigate the influence of the P supply on total root production and root mortality (i.e., root turnover) and to assess the benefit of a more rapid root turnover on P acquisition. Shoot development and grain yield was reduced in the '-P' treatment, whereas the standing root system had nearly the same size as in the '+P' treatment. Gross root growth was measured using the 'ingrowth core method'. Mesh bags filled with root-free soil were buried into the rooting zone (0-30 cm) and root growth into the bags over periods of 2-3 weeks was determined. Assuming that no root mortality occured inside the bags during this short period, root length in the bags will be a measure of total root production. Total root production between April and June exceeded the size of the standing root system by a factor of 2 to 3 and was significantly higher at P deficiency. Root mortality as the difference between total root production and the size of the standing root system was also increased at P shortage. P uptake was calculated by using a mechanistic transport and uptake model. Calculations based on gross root growth and root mortality resulted in a higher uptake than calculations based on the development of the standing root system, although the length of the active roots were the same in both calculations. This was due to a better exploitation of undepleted soil areas by the growing root system. The root renewal by a continuous root growth and root mortality is discussed as a mechanism of P uptake efficiency."],["dc.identifier.doi","10.1023/A:1013345718414"],["dc.identifier.isi","000172862000005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55990"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Kluwer Academic Publ"],["dc.relation.issn","0032-079X"],["dc.title","Root production and root mortality of winter barley and its implication with regard to phosphate acquisition"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","331"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Biology and Fertility of Soils"],["dc.bibliographiccitation.lastpage","339"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Steingrobe, B."],["dc.contributor.author","Schmid, H."],["dc.contributor.author","Gutser, R."],["dc.contributor.author","Claassen, N."],["dc.date.accessioned","2018-11-07T09:11:25Z"],["dc.date.available","2018-11-07T09:11:25Z"],["dc.date.issued","2001"],["dc.description.abstract","Winter wheat was grown over 2 years (1995, 1996) in an organic and integrated cropping system on sandy and loamy soils. Root growth was measured on five to six occasions each year with an auger sampling procedure and the ingrowth core method. The first resulted in an estimate of net root development, while the latter revealed gross root growth (GG) or root production. Total root production was about 80-150 km m(-2) (0- to 30-cm soil layer) between April and July and exceeded the net size of the root system at harvest by a factor of between 2 and 4. The C input into the soil could be estimated as 1.4-2.6 t ha(-1) by this root production. The cropping systems had nearly no influence on root production. The largest differences occurred between the years. The net root length tended to be lower on sandy soils compared to the loam, but total root production was higher. Root mortality, which is the difference between GG and net root growth, was also higher on sandy soils. The turnover index, which is the mean of the relative root production rates and relative root mortality rates, was positively related to the soil sand content in both years."],["dc.identifier.doi","10.1007/s003740000334"],["dc.identifier.isi","000168387300010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26719"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0178-2762"],["dc.title","Root production and root mortality of winter wheat grown on sandy and loamy soils in different farming systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","617"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE"],["dc.bibliographiccitation.lastpage","622"],["dc.bibliographiccitation.volume","163"],["dc.contributor.author","Steingrobe, B."],["dc.contributor.author","Schmid, H."],["dc.contributor.author","Claassen, N."],["dc.date.accessioned","2018-11-07T10:45:41Z"],["dc.date.available","2018-11-07T10:45:41Z"],["dc.date.issued","2000"],["dc.description.abstract","The ingrowth core method can be used to measure root gross growth (i.e. root production). A mesh bag filled with root free soil is buried into the root zone. After about 14 days, the bag is pulled out and root length inside the core can be determined. An objection against this method is the inability to obtain the same soil conditions inside the bag as outside, which can result in different root growth pattern in the ingrowth core compared to the bulk soil. To study this, mesh bags were buried in a stand of oilseed rape and were filled with soil at different nitrate, phosphate, moisture, and bulk density levels. Results showed that root growth was only influenced by a high nitrate content and a high soil density in the coes, which resulted in higher and lower root length densities (RLD), respectively. In a long-term ingrowth experiment similar root length densities in the cores and in the bulk soil were measured, indicating that there were no root growth enhancing or impeding conditions inside the ingrowth cores. The conclusion is drawn, that the ingrowth core method gives reliable results, provided the N content and the soil density inside the bags are to the bulk soil."],["dc.identifier.doi","10.1002/1522-2624(200012)163:6<617::AID-JPLN617>3.0.CO;2-0"],["dc.identifier.isi","000166125500009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/47560"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1436-8730"],["dc.title","The use of the ingrowth core method for measuring root production of arable crops - influence of soil conditions inside the ingrowth core on root growth"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]