Long term manuring experiments in the state experiment station moystad norway

Jetne, M.

Forskning og Forsok i Landbruket 25(6): 519-536


Accession: 005829445

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A report is given of 2 long-term experiments [in Norway] designed to determine suitable rates of fertilizer application for a 7 yr rotation (potatoes, spring wheat, barley, 3 yr of grass and oats) repeated 7 times, starting in 1922. The amounts of N, P and K added in fertilizer and removed by the crops was determined. Yields declined under the lowest rate of fertilizer application (15.1 kg N, 10.4 kg P and 21.6 kg K per 1/10 ha). Unfertilized soil gave yields 77-80% of the lowest fertilization rate. N and K content declined under this rate, but P increased. The highest fertilizer application, (79.5 kg N, 15.4 kg P and 75.0 kg K per 1/10 ha) nearly doubled fodder unit yields in the 7th rotation. Under these rates N content was in balance; K and P content increased.