ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Derivation of critical nutrient concentrations for growth rate from data from field experiments (1988)
    Springer
    Plant and soil 109 (1988), S. 159-169 
    Details
    ISSN: 1573-5036
    Keywords: Brassica oleracea vargemmifera ; Brussels sprout ; model ; nitrate ; nitrogen ; sap ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Present methods for determining critical nutrient concentrations in plants and soils are unsatisfactory if concentrations change with time while the crop is growing. In such cases the critical concentration can only be applied in relation to growth rate at any given moment. For interpreting field experiments this introduces considerable difficulties: two possible approaches to these problems are suggested, one of which uses a simple simulation model. Results from a Brussels sprout nitrogen experiment are used to show how, using this approach, a single critical sap nitrate concentration (380 mg NO3 N.l−1 for 95% of potential growth rate) may serve to explain the results at all growth stages in three seasons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202080
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An analysis of the growth response of carrot seedlings to deficiency in some mineral nutrients (1993)
    Springer
    Plant and soil 150 (1993), S. 147-156 
    Details
    ISSN: 1573-5036
    Keywords: carrot ; critical ; concentration ; Daucus carota ; deficiency ; mineral ; model ; nutrient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Critical plant concentrations for a reduction in relative growth rate to 90% of that of fully nourished plants were estimated by a novel method for several mineral nutrients. Carrot plants were grown from seed for 28 days in a range of nutrient solutions omitting N, P, K, Ca, S, Mg, Fe, B, Mn, Zn, Cu and Mo as separate treatments. All treatments except -Mn, -Zn, -Cu and -Mo resulted in effects on plant growth and the development of deficiency symptoms. Estimates of critical concentrations were based on a simple simulation model incorporating the principle of nutrient dilution with increasing plant weight and on mineral analysis of the plants. Parameters governing the shape of the relationship between fractional relative growth rate and plant nutrient concentration were altered until the model predicted the observed final mean dry weight of deficient plants and time of divergence of this growth curve from that of fully nourished plants. Critical concentrations so obtained were higher than those previously reported for Ca, Fe, N and P in carrots and lower for K, Mg and S.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00779185
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The sulphate-S/total S ratio in plants as an index of their sulphur status (1986)
    Springer
    Plant and soil 91 (1986), S. 61-71 
    Details
    ISSN: 1573-5036
    Keywords: Critical concentration ; Plant analysis ; Sulphate sulphur ; Sulphate/total sulphur ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several authors are advocating the use of the SO4−S/total S ratio in the plant as the best index of S status. We have traced the arguments put forward in support of this index, and we show that they are based either on unfair comparisons with other indices, such as SO4−S or total S alone, or inappropriate statistical treatment. The SO4−S/total S index has two fundamental disadvantages compared with SO4−S or total S alone: (1) the numerator (SO4−S) is the major variable in the denominator, so the ratio is likely to be less sensitive than either of the measurements alone; (2) its determination involves twice as much analytical work as either measurement alone. Examination of some of the source references indicates that SO4−S by itself is the most satisfactory S index. Whenever whole plants are analysed, any index which includes organic S is subject to variation due to tissue age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181819
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...