**3.1 Crop damage of flooding and effects of fertilization**

As the flood in central eastern Norway happened after sowing in the start of the growing season in 1995, it was possible to make research on crop damage and measure if fertilization after the flooding could make reasonable crop yields.

It was found that potatoes had almost total crop failure after waterlogging, even if the period of waterlogging lasted only 1–2 days. Areas with grass for silage and hay production had delayed growth, but recovered after waterlogging and gave reasonable yields [9]. Waterlogging of fields with cereals gave significant yield loss, but the duration of the waterlogged period had less impact (**Table 2**).

As the flooding caused leaching of soluble plant nutrients from the soil and fertilizer, which had been applied in the spring, a series of field experiments were placed


#### **Table 2.**

*Influence on waterlogging on yield (kg ha−1, 15% water content) and protein (% of DM) of spring wheat (Triticum aestivum) on fields in Østerdalen (Solør) and Gudbrandsdalen (Selsvollene) in 1995.*
