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  • organic fertilizer  (3)
  • Brassica  (1)
  • Dry matter  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Carbon and nitrogen mineralization characteristics of organic nitrogen fertilizers in a soil-less incubation system (1990)
    Springer
    Nutrient cycling in agroecosystems 23 (1990), S. 97-103 
    Details
    ISSN: 1573-0867
    Keywords: Carbon ; mineralization ; nitrogen ; organic fertilizer ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The C and N mineralization characteristics of two organic N fertilizers were determined in a soil-less incubation system at three temperature regimes. Protox (derived from activated sewage sludge) initially degraded more rapidly by microbial action compared with dried blood. However, dried blood released more CO2-C and inorganic N towards the end of the incubation periods. The rate of microbial degradation increased with temperature. Mineralization characteristics of protein-based N sources are discussed in relation to organic N nutrition of vegetable crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01063336
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in percentage organic carbon content during ontogeny (1984)
    Springer
    Planta 160 (1984), S. 97-101 
    Details
    ISSN: 1432-2048
    Keywords: Brassica ; Hordeum (C content) ; Carbon content ; Ontogeny and carbon content ; Temperature and carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in percentage organic carbon content were assessed during the first five weeks of growth of Uniculm barley (Hordeum vulgare) and Brussels sprouts (Brassica oleracea) plants grown in controlled-environment conditions at two constant temperatures, 16° and 22°C. Foliage (leaf laminae), stem, and root material was assayed in both species, together with leaf sheaths of barley and cotyledon laminae of Brussels sprouts. In barley, there was a decline in percentage organic carbon content with increasing foliage age in plants grown at 22°C, but in sheath material there was no significant change at either temperature. Root material showed a decline in percentage carbon content at both growth temperatures, whereas stems showed the opposite trend. Similar results were found in Brussels sprouts, with an overall decline in percentage carbon content in foliage at 22°C and a rise in stem material at both growth temperatures. However, roots showed no significant change in percentage carbon content over the experimental period. The results demonstrate that percentage organic carbon content may change during plant growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392856
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of supplemental nitrate and thermal regime on the nitrogen nutrition of chickpea (Cicer arietinum L.) (1985)
    Springer
    Plant and soil 83 (1985), S. 265-277 
    Details
    ISSN: 1573-5036
    Keywords: Cicer arietinum L. ; Chickpea ; Dry matter ; Morphology ; Rhizobium ; Temperature interactions ; Yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nodulated chickpea plants were grown in pots in a glasshouse programmed to simulate either hot (32.5°C day/18°C night) or warm (25°/18°C) thermal regimes characteristic of those experienced by crops grown in different seasons or locations in the semi-arid tropics. The plants were irrigated with nutrient solution either devoid of inorganic nitrogen or containing 0.71, 1.43 or 2.86 mM nitrate. Increasing concentrations of supplemental nitrate stimulated the rate of dry matter production by vegetative plants in both thermal regimes. Differences between vegetative dry weight of plants given nitrate and those relying exclusively on symbiotic dinitrogen fixation were greatest in the hot regime where the durations of vegetative growth were shorter. However, symbiotically-dependent plants and those given 0.71 mM nitrate continued to produce branches throughout the reproductive period, particularly in the warm regime. As they matured, these plants became more comparable in vegetative stature to those which had received greater concentrations of nitrate and had established final branch numbers earlier (i.e prior to main pod-fill). Potential seed yields were determined primarily by the number of potential reproductive sites (nodes) available (i.e. by the extent of branching) which largely determined the number of seeds harvested. Since final branch numbers in all nitrate treatments were greatest in the warm regime, yields were also larger than those at 32.5°C. The implications of these data for the nitrogen economy of chickpea crops is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184298
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen fertilizer value of activated sewage derived protein: Effect of environment and nitrification inhibitor on NO 3 - release, soil microbial activity and yield of summer cabbage (1992)
    Springer
    Nutrient cycling in agroecosystems 33 (1992), S. 47-57 
    Details
    ISSN: 1573-0867
    Keywords: Ammonium ; cabbage ; nitrate ; nitrogen fertilizer ; nitrification inhibitor ; organic fertilizer ; soil microbial activity ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Yield response of summer cabbage (Brassica oleracea varcapitata cv. Hispi F1) to N applied as organic (activated sewage sludge derived protein [Protox] and dried blood) and inorganic (ammonium nitrate, ammonium sulphate, sodium nitrate and urea) fertilizers was compared in relation to the N availability characteristics of the materials. Effects of the nitrification inhibitor dicyandiamide (DCD) on N release, crop yield and N status were also assessed. In addition CO2 efflux was measured from amended soil to determine effects of fertilizer application on soil microbial activity. The organic N sources were mineralized quickly on application to soil and exhibited similar patterns of NH4-N depletion and NO3-N accumulation as functions of thermal-time as with mineral fertilizers. However, the yield response to organic N was marginally smaller (though not significantly) compared with mineral forms; probably because less N was released to the crop. This was reflected in smaller total N concentrations and N recoveries in plants supplied with organic fertilizer. Applied DCD increased the thermal-time for complete nitrification of NH4-N sources and raised the total N content of the crop, but had no overall effect on crop growth. In contrast to inorganic N sources which generally reduced CO2 efflux from soil, application of protein-based fertilizers increased the rate of soil microbial activity directly by raising substrate availability. Sewage sludge derived protein provided an effective alternative to mineral fertilizers for the nutrition of summer cabbage whilst minimising stress of the soil environment which may occur following the application of conventional forms of inorganic N to the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058009
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of organic and inorganic nitrogen fertilizers: Their nitrate-N and ammonium-N release characteristics and effects on the growth response of lettuce (Lactuca sativa L. cv. Fortune) (1989)
    Springer
    Plant and soil 115 (1989), S. 135-144 
    Details
    ISSN: 1573-5036
    Keywords: growth response ; inorganic fertilizer ; Lactuca sativa L. ; leaching loss ; nitrogen ; organic fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of pot grown lettuce to inorganic (ammonium nitrate) and organic (dried blood and Protox) N fertilizers was determined at two temperature regimes (15°C day/10°C night and 20°C day/15°C night) and related to the NH4−N and NO3−N release characteristics of each material. The N release characteristics of the organic materials matched the N requirements of lettuce more closely than the inorganic fertilizer. However, was rapidly released from the protein based materials such that composts were depleted of available fertilizer N at the same time irrespective of the form supplied. The warmer temperature regimes resulted in a more rapid depletion of the fertilizers due to biological immobilization such that N recoveries in shoots, roots and leachates were reduced. Approximately 20% of the N present in Protox (a material derived from activated sewage sludge, processed to reduce the heavy metal content to minimal levels) appeared to be resistant to microbial degradation and was unavailable to the plants. Therefore, the growth response of lettuce was slightly reduced with Protox compared to the other materials at similar rates of incorporation. The organic materials did not contribute NO3−N to the plant and small NO3−N concentrations in petioles were derived from the water used for irrigation. However, NO3−N levels in plants receiving inorganic ammonium nitrate were initially high but progressively declined as the fertilizer NO3−N became depleted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220704
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    Paper (German National Licenses)
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