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  • 1
    Electronic Resource
    Electronic Resource
    Significance of the sequence of K+ and NH4 + application for the availability of nitrogen to the rice plant (1974)
    Springer
    Plant and soil 41 (1974), S. 189-193 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The sequence of K+ and NH4 + application in soil significantly influences the dry matter production of rice plant as well as its nitrogen uptake. The above influence is more pronounced at the lower level of nitrogen application than at its higher level. The highest availability of added NH4 + is observed in the treatment where K+ has been added 7 days before the addition of NH4 + and the least when K+ has been added 7 days after the addition of NH4 +. When added simultaneously, the availability values are intermediate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017954
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on availability of fixed NH4 + to nitrifying organisms (1974)
    Springer
    Plant and soil 41 (1974), S. 287-291 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrification of fixed NH4 + in 18 soils representing different agro-climatic regions of West Bengal reveals that 5.5 to 47.9% of fixed NH4 + is nitrified over a 45-day incubation period. Although, nitrification of fixed NH4 + increases with the increase in the incubation period, most of it is nitrified between the 15th and 30th day. When the NH4 +-fixing power of the soil increases the availability of fixed NH4 + to nitrifying bacteria decreases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017256
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Availability of fixed NH4 + to crops (1982)
    Springer
    Plant and soil 65 (1982), S. 345-349 
    Details
    ISSN: 1573-5036
    Keywords: Ammonium ; Fixed ammonium ; Maize ; Mineralization ; Nitrate ; Nitrite ; Rhizosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Significantly lower amounts of exchaneable NH4, soluble NO3 and clay-fixed NH4 forms of N were observed in the unfertilized fields with high rather than low-density cropped plots. Irrespective of planting densitites, the fixed NH4 content in soil increased with increase in the period of crop growth. N uptake by plant and total bacterial population of rhizosphere soil were significantly higher in the plots with the high than with the low-density planting. Availability of native fixed NH4 + to crops and biological utilization of a considerable amount of recently mineralized NH4 + in fixed form is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375055
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of cropping and N-fertilization on changes in different forms of nitrogen in an alluvial soil (1987)
    Springer
    Plant and soil 101 (1987), S. 137-139 
    Details
    ISSN: 1573-5036
    Keywords: inorganic N ; maize ; N-uptake ; organic N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Irrespective of cropping and N-fertilization, the amount of available N significantly decreased and fixed NH 4 + -N increased with increase in the period of investigation. A substantial decrease in the amount of total hydrolysable N due to cropping was noted and the amount of decrease was less in the N-fertilized than the unfertilized soil. N-fertilization resulted in an increase in dry matter yield and N-uptake by the crop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371042
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of different moisture sequences and a short period of drying between them on the changes in sulphate levels in soils during incubation (1980)
    Springer
    Plant and soil 57 (1980), S. 393-397 
    Details
    ISSN: 1573-5036
    Keywords: Available sulphate ; Drying ; Inorganic sulphate addition ; Moisture sequences ; S-free organic matter ; S-mineralisation ; Waterlogged condition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Effect of two different moisture sequences with a short period of drying between them on the changes in its sulphate levels during incubation revealed considerable immobilisation of sulphate in soils maintained either at 50% of water holding capacity or under waterlogged condition prior to drying. The extent of immobilisation was more pronounced when starch or inorganic sulphate sulphur were added. Drying resulted in release of available sulphate sulphur in the soil previously incubated at 50% of water holding capacity and the effect was more striking when starch was added. Whereas, drying caused a decrease in the amount in the soil kept under waterlogged condition. A short period of drying did release sulphate sulphur in available form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211696
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    Paper (German National Licenses)
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