| Abstract: | Abstract A long term field experiment was undertaken in four different sites in Québec for evaluating Newbury raspberry nutrient requirement. Addition of farmyard manure one year before the plot establishment at the rate of 70 tons/hectare, increased the fruit production by 20% over the check plot; its residual effect persists even four years after incorporation. Critical nutrient contents of leaves are shown, maximum yields of this cultivar depending on the plant age and the amount of N‐P‐K application are tabulated. These parameters, in combination with farmyard manure, further increased the fruit production up to 35% when ever soil moisture was well provided. A positive effect of P fertilizer on the fruit production was more pronounced than that of N‐fertilizer on this territory and the response to K fertilizer could be obtained where a farmyard manure was applied. |
