Acta Agraria Debreceniensis (DE-journals)

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https://hdl.handle.net/2437/271455
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Böngészés

Acta Agraria Debreceniensis (DE-journals) Tárgyszó szerinti böngészés "0.01 M CaCl2"

Megjelenítve 1 - 2 (Összesen 2)
  • Nincs kép
    TételSzabadon hozzáférhető
    The effect of long-term fertilization on the 0.01 M CaCl2 extractable nutrient content of a meadow soil
    (2012-12-16) Bertáné Szabó, Emese
    During my research, I studied the 0.01 M CaCl 2 extractable NO 3 - -N, NH 4 + -N, Norg, P and K contents of the soil samples originated from a long term fertilisation trial in the experimental site Hajdúböszörmény. Relationships among the soil nutrient contents, the agronomic nutrient balances of the 2009 year, and fertilization were studied.  From the results of the study it was concluded as follows: – Fertilization significantly increased the CaCl 2 extractable NO 3 - -N, NH 4 + -N, and K contents of soil. – Norg fraction increased as a function of the increasing yield. Hence, it can be assumed that the greater the produced yield, the more the stubble and root residues remain on the arable land. These organic residues can result significant increase in the Norg content of soils. – The CaCl 2 extractable P and K contents were compared with the calculated P and K limit values. According to these, the experimental soil has a good phosphorus and lower potassium supply capacity. These results are in accordance with the results of the conventional Hungarian fertilization recommendation system. – It can be stated that the 0.01 M CaCl 2 is able to determine not just inorganic N forms but Norg fraction as well that characterize the easily mineralizable nitrogen reserves. The results proved that AL-P and -K (ammonium lactate acetic acid, traditional Hungarian extractant) are in good agreement with the P and K reserves, but it is important from the aspect of environmental protection and plant nutrition to measure the easily soluble and exchangeable K-, and P-contents of soil. 0.01 M CaCl 2 method is recommended for this.
  • Nincs kép
    TételSzabadon hozzáférhető
    Study of factors controlling the amount of 0.01 M CaCl2 extractable Norg fraction
    (2018-09-05) Szabó, Emese; Loch, Jakab
    The use of new methods describing the “readily available” nutrient content of the soil is spreading on a global scale. The 0.01 M CaCl2 extractant is a dilute salt solution in which the easily soluble inorganic (nitrate-N and ammonium-N) and organic N fractions, P, K and micronutrients are also measurable. The 0.01 M CaCl2 has been tested in the University of Debrecen, Institute of Agricultural Chemistry and Soil Sciences since the 90’s. The results of the researches related to organic N fraction, performed in the last decades, and the results of the present study (originating from the long-term experiment of Karcag, 2007–2009) can be concluded as follows: The measurement of easily soluble and oxidizable organic nitrogen (Norg), besides inorganic fractions, could improve the nutrient management. The amount of the Norg fraction is determined by the soil conditions, therefore it is considered to be a site-specific parameter. Management practices and cropyear affect the amount of Norg as well. The present research confirmed that, the effect of fertilization on the amount of Norg can be explained by the changing of the yield (related to total biomass production), while the effect of cropyear is related to the differences in mineralization circumstances and yield as well. The measurement of the Norg fraction is increases the accuracy of N-supply, therefore it could prevent the environmentally harmful excess N application as well.