Рубрики:
SOIL ORGANIC-MATTER
MICROBIAL BIOMASS
N-MINERALIZATION
SPRING WHEAT
Кл.слова (ненормированные):
liquid fertilizer -- granular fertilizer -- mini-till -- no-till -- ammonium -- nitrate -- N-15
SOIL ORGANIC-MATTER
MICROBIAL BIOMASS
N-MINERALIZATION
SPRING WHEAT
Кл.слова (ненормированные):
liquid fertilizer -- granular fertilizer -- mini-till -- no-till -- ammonium -- nitrate -- N-15
Аннотация: In nitrogen (N) -limited agricultural systems, a high microbial immobilization of applied fertilizer-N can limit its availability to plants. However, there is scarce information on the effect of the form of fertilizer used on the plant-microorganism competition in clay-rich soils under a severe semi-arid climate. In a field study, we investigated the wheat-microorganism competition after the direct application of (NH4NO3)-N-15 closely to seeds in arable fields in North Kazakhstan, documenting the effect of the use of liquid versus granular fertilizer and mini-tillage versus no-tillage. Our results barely showed any fertilizer-N translocation in the soil. Plants outcompete microorganisms for fertilizer-N during the vegetation period. Microbial-to-plant N-15 ratios revealed a predominant fertilizer-N-15 uptake by plants. The strong competition for N was mainly related to the placement of the fertilizer close to the seeds. Moreover, the long time interval between fertilization and sampling enhanced the competition for N, meaning that previously microbially immobilized N became available to plants through the death of microorganisms and their subsequent mineralization. The fertilizer distribution between microorganisms and plants did depend on the form of fertilizer used, owing to the good solubility of granular fertilizer. The smaller fertilizer-N uptake under the no-tilling condition was probably due to the more intense soil compaction, which caused a reduction in plant growth. The application of fertilizer close to the seeds and the small fertilizer translocation during the vegetation period ultimately resulted in a high level of plant N being derived from the fertilizer.
WOS
Держатели документа:
Leibniz Univ Hannover, Inst Soil Sci, Herrenhauser Str 2, D-30419 Hannover, NH, Germany.
Martin Luther Univ Halle Wittenberg, Dept Geoecol, von Seckendorff Pl 4, D-06120 Halle, Germany.
Sci & Prod Ctr Grain Farming, Baraev Str 15, Shortandy 021601, Kazakhstan.
Tech Univ Clausthal, Adolph Roemer Str 2A, D-38678 Clausthal Zellerfeld, Germany.
Russian Acad Sci, Siberian Branch, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia.
Fed Inst Geosci & Nat Resources BGR, Stilleweg 2, D-30655 Hannover, Germany.
JSC Atameken Agro, Estern Ind Zone Driveway 20,Bldg 30, Kokschetau 020000, Kazakhstan.
Amazonen Werke H Dryer GmbH & Co KG, Amazonenwerk 9-13, D-49205 Hasbergen, Germany.
Доп.точки доступа:
Koch, Markus; Akshalov, Kanat; Carstens, Jannis Florian; Shibistova, Olga; Stange, Claus Florian; Thiedau, Simon; Kassymova, Alfiya; Sauheitl, Leopold; Meinel, Tobias; Guggenberger, Georg