Potassium uptake efficiency and dynamics in the rhizosphere of maize (Zea mays L.), wheat (Triticum aestivum L.), and sugar beet (Beta vulgaris L.) evaluated with a mechanistic model

Samal, Debasmita; Kovar, John L.; Steingrobe, Bernd; Sadana, U. S.; Bhadoria, P. B. S.; Claassen, N.

doi:10.1007/s11104-009-0277-6

Cited by 53 publications

(37 citation statements)

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“…When applied to nutrients such as K and P, such models have generally proved quite efficient at predicting the acquisition over time scales of days or weeks in the case of soils receiving high K or P inputs, but almost systematically failed in low input conditions (Brewster et al 1976;Claassen et al 1986;Lu and Miller 1994;Mollier et al 2008;Samal et al 2010;Schenk and Barber 1980). Under such conditions, those models actually underestimate the observed uptake flux (Fig.…”

Section: Why and Which Plant Nutrition Models What For?mentioning

confidence: 99%

Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail?

et al. 2011

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Background In the context of increasing global food demand, ecological intensification of agroecosystems is required to increase nutrient use efficiency in plants while decreasing fertilizer inputs. Better exploration and exploitation of soil resources is a major issue for phosphorus, given that rock phosphate ores are finite resources, which are going to be exhausted in decades from now on. Scope We review the processes governing the acquisition by plants of poorly mobile nutrients in soils, with a particular focus on processes at the root-soil interface. Rhizosphere processes are poorly accounted for in most plant nutrition models. This lack largely explains why present-day models fail at predicting the actual uptake of poorly mobile nutrients such as phosphorus under low input conditions. A first section is dedicated to biophysical processes and the spatial/temporal development of the rhizosphere. A second section concentrates on biochemical/biogeochemical processes, while a third section addresses biological/ecological processes operating in the rhizosphere. Conclusions New routes for improving soil nutrient efficiency are addressed, with a particular focus on breeding and ecological engineering options. Better mimicking natural ecosystems and exploiting plant diversity appears as an appealing way forward, on this long and winding road towards ecological intensification of agroecosystems. (Résumé d'auteur

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Section: Why and Which Plant Nutrition Models What For?mentioning

confidence: 99%

Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail?

et al. 2011

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“…An example of a model to predict K uptake during growth is that of Claassen (1994) which takes into account nutrient uptake by both roots and root hairs, and has been used recently in pot experiments to study K uptake efficiency and dynamics in the rhizosphere of maize, wheat and sugar beet (Samal et al 2010). The model is based on three basic processes: (i) release of K from the solid phase into the solution phase, which is governed by sorption and desorption processes, (ii) transport of K by mass flow and diffusion, mainly diffusion, and (iii) K uptake into the root which depends on the nutrient concentration in the soil solution and is measured by a modified Michaelis-Menten equation.…”

Section: K Fertilization Recommendationsmentioning

confidence: 99%

Research on potassium in agriculture: needs and prospects

2010

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This review highlights future needs for research on potassium (K) in agriculture. Current basic knowledge of K in soils and plant physiology and nutrition is discussed which is followed by sections dealing specifically with future needs for basic and applied research on K in soils, plants, crop nutrition and human and animal nutrition. The section on soils is devoted mainly to the concept of K availability. The current almost universal use of exchangeable K measurements obtained by chemical extraction of dried soil for making fertilizer recommendations is questioned in view of other dominant controlling factors which influence K acquisition from soils by plants. The need to take account of the living root which determines spatial K availability is emphasized. Modelling of K acquisition by field crops is discussed. The part played by K in most plant physiological processes is now well understood including the important role of K in retranslocation of photoassimilates needed for good crop quality. However, basic research is still needed to establish the role of K from molecular level to field management in plant stress situations in which K either acts alone or in combination with specific micronutrients. The emerging role of K in a number of biotic and abiotic stress situations is discussed including those of diseases and pests, frost, heat/drought, and salinity. Breeding crops which are highly efficient in uptake and internal use of K can be counterproductive because of the high demand for K needed to mitigate stress situations in farmers' fields. The same is true for the need of high K contents in human and animal diets where a high K/Na ratio is desirable. The application of these research findings to practical agriculture is of great importance. The very rapid progress which is being made in elucidating the role of K particularly in relation to stress signalling by use of modern molecular biological approaches is indicative of the need for more interaction between molecular biologists and agronomists for the benefit of agricultural practice. The huge existing body of scientific knowledge of practical value of K in soils and plants presents a major challenge to improving the dissemination of this information on a global scale for use of farmers. To meet this challenge closer cooperation between scientists, the agrochemical industry, extension services and farmers is essential.Keywords Potassium availability . Potassium micronutrient interaction . Spatial availability of potassium . K/Mg ratio . Abiotic stress . Biotic stress . Frost resistance . Food quality . K/Cd relations Plant Soil (2010) 335:155-180

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“…For example, rooting depth and root density determine how well a plant can access the pool of potentially available nutrients in the tested layer and in the subsoil (Gahoonia and Nielsen 2004; Richardson et al 2011;Samal et al 2010).…”

Section: Limitations Of Soil Testsmentioning

confidence: 99%

Soil testing for P and K has value in nutrient management for annual crops

Geisseler¹,

Miyao²

2016

Calif Agr

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Adequate nutrients in forms available to plant roots are essential for sustainable crop production. Soil testing for phosphorus and potassium availability allows growers and crop advisers to determine whether a soil is likely to respond to fertilization. As yields have risen with improved management and production systems, crop nutrient demand and the removal of nutrients with harvested crops have increased. An indepth discussion of soil tests for phosphorus and potassium and their use in California cropping systems is clearly needed. We review how these nutrients become available to plant roots, how samples are taken and test results interpreted, complementary ways to assess the adequacy of supplies and what research is needed to improve soil testing for phosphorus and potassium. P hosphorus (P) and potassium (K) are essential nutrients required in rather large amounts by crops. The application of fertilizers is often required to meet the crops' demand, with the application rate depending on the availability of nutrients in the soil. Insufficient application rates result in lower yields and may reduce soil fertility over time as the availability of nutrients decreases. In contrast, the application of excess nutrients increases production costs and may cause environmental problems.Soil testing is one of the most costeffective nutrient management tools available to growers and crop advisers. It can guide fertilization decisions for individual fields, and it can assess whether a soil is likely to respond to fertilization (Cox 1994). Soils differ in their capacity to supply nutrients to crops.Early research has shown that many soils in California do not supply sufficient P to annual crops, and P fertilization has often been found to be highly beneficial (Jenny et al. 1946). Tree crops, in contrast, are less likely to have a yield response to P fertilizer. Few cases of K deficiency were reported in the first half of the 20th century (Jenny et al. 1946). With a few exceptions, K has not received much attention since then. We focus on P and K here, but our discussion applies to other nutrients, such as calcium or magnesium, as well. One exception is soil sampling for residual soil nitrate-N. Nitrate is directly plant available, but much more mobile in the soil than P and K and thus easily lost.An in-depth discussion of soil tests and their use with a focus on California cropping systems is currently missing, but clearly needed. Improved management and varieties have increased productivity considerably in California. Most recently, the shift to semipermanent drip irrigation systems has further increased crop yield. As a result, nutrient removal is higher and soil nutrient depletion faster because of the more confined root zone. A positive response to P and K fertilization is now much more likely even on soils that have long been considered sufficiently fertile. For these reasons, and because environmental concerns with overfertilization are being raised more Online: http://dx.doi.org/10.3733/ca.2016a0007Jack Kelly Clar...

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Potassium uptake efficiency and dynamics in the rhizosphere of maize (Zea mays L.), wheat (Triticum aestivum L.), and sugar beet (Beta vulgaris L.) evaluated with a mechanistic model

Cited by 53 publications

References 30 publications

Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail?

Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail?

Research on potassium in agriculture: needs and prospects

Soil testing for P and K has value in nutrient management for annual crops

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