Section 8
Chapter 7,891

The effect of nitrate fertilizer on germinating seeds

Thorup, S.; Yates, K.

Tidsskrift for Planteavl 95(4): 399-410


Accession: 007890538

Ammonium nitrate (26% NH4NO3) has shown to reduce the quantity of weed seeds when applied after sowing spring barley. Increasing amounts of ammonium nitrate in cultivation trials, at five of the governments research stations, reduced the number of week plants, (av. of 81 species) in May 1980-82, by up to 60%. In 1979, where April's precipitation was considerably larger and the soil surfaces were constantly damp, the N-effect was only around half as much. The trials also showed that species sensitivity to N varied and that the order of degree of sensitivity was not especially affected by weather conditions during germination. Results from short term trials in 1983-87 confirmed the connection between soil moisture and N-effect. In addition, they emphazised the speices' different reactions to N-fertilizer. Among the most sensitive species were Stellaria media, Viola arvensis, Spergula arvensis, chamomile and speedwell species. More resistant were Sinapis arvensis, Chenopodium album and Polygonum species. For grass species. Poa annua and Poa trivalis were considerably reduced, while Elytrigia repens and Avena fatua were totally unaffected. Germination in small containers in a glass house, further confirmed the varying sensitivity of the species to N and substantiated that ammonium nitrate can penetrate a 5 mm thin soil layer and weaken germination of barley.

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