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Weeds were monitored during April 1996 along a 36 m×36 m grid within a 21 ha winter wheat field to detected whether black bindweed (Fallopia convolvulus L.), cleavers (Galium aparine L.), which are important weeds in cereals, and total weed densities reached economical thresholds for control. The geostatistical method of block kriging with indicator values(More)