Modes of nitrogen action within the soil plant system after nitrogen 15 labeled nitrogen application to irrigated and non irrigated sugar beet

Siegert, B.; Rauhe, K.

Archiv für Acker- und Pflanzenbau und Bodenkunde 31(11): 703-710


ISSN/ISBN: 0365-0340
Accession: 005910648

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A long-term trial at a dry site with low groundwater table in Seehausen near Leipzig [East Germany] was used to study differentiated 15N mineral nitrogen applications (80, 160, 240 kg N .cntdot. ha-1) to sugar beet for the effect on plant (primarily sugar beet) and soil over a period of two years (succeeding crop; spring barley). Other test factors were manuring (0 and 240 kg .cntdot. ha-1 farmyard manure nitrogen to sugar beet) and sprinkler irrigation. The high effect of irrigation was clearly reflected by beet body yields (.ovrhdot.x yield increase = 21.0 tons .cntdot. ha-1) and nitrogen uptake by the plants. Sugar beet and barley absorbed 52% and 72% of the nitrogen applied without irrigation and with irrigation, respectively. Apart from the high mineral nitrogen uptake, the soil supplied about 70% of the total nitrogen uptake by the beet. This figure includes also manure N and additional N sources. Irrigation stimulated the uptake mineral and soil nitrogen by the plants. After two years 33% (non-irrigated variant) and 24% (irrigated variant) of the nitrogen applied were still available at a depth of 0 to 60 cm.