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  • 1
    ISSN: 1573-5036
    Schlagwort(e): Diffieultly available K ; Exchangeable K ; K uptake ; Mica K ; Regression Greenhouse ; Sodium tetraphenylboron ; Sorghum-sudangrass ; Yield
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Bulk samples of 30 surface soils characterized in the National Cooperative Soil Survey of Louisiana were collected at the original sites and planted with sorghum-sudangrass in the greenhouse. The native K was exhausted by a total of four croppings. The available soil K was extracted with 1N NH4OAc 7.0 and 0.1N HCl while the difficultly available-K was extracted by 0.3N NaTPB (sodium tetraphenylboron). In addition, the mica content was estimated by differential dissolution. All soils except Dundee produced the greatest dry matter yield in the first crop with steadily decreasing production in the succeeding crops. The same pattern was shown in the K uptake. It appears that the first crop removed a large portion of the exchangeable K. There was a high degree of relationship between plant uptake of K and exchangeable K in the soils (r2=0.89**). Uptake by the subsequent crops was generally controlled by the K in the micaceous minerals (r2=0.89**). Since there was a high coefficient of determination between mica-K and difficulty available-K (r2=0.91**) one also finds that uptake of K by crops 2, 3 and 4 was also well correlated to difficultly available K (R2=0.94**). The uptake of K that was not originally in the exchangeable form was also highly related to difficultly available-K (R2=0.51**).
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Plant and soil 132 (1991), S. 289-292 
    ISSN: 1573-5036
    Schlagwort(e): acid soil tolerance ; macronutrient concentrations ; micronutrient concentrations ; N uptake
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The main purpose of this study was to identify soybean cultivars which maintained high yields on acid soil. A secondary purpose was to determine what nutrient changes were responsibe for the yield losses occurring due to low pH soil. The significant cultivar × lime interaction indicated that yield in some cultivars was more adversely affected than in others. Terra Vig 708 and Deltapine 345 showed no significant yield loss when grown on low pH compared to limed soil and were classified as very insensitive to soil acidity. Other cultivars were classified as either moderately insensitive, sensitive, very sensitive, or severely sensitive. Analysis of variance and correlation studies indicated that the most probable reason for reduced seed yield on low pH compared to limed soil in this study was interference with N fixation and reduced N uptake by the plants grown on low pH soil.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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