Herbicide concentrations in waterways following aerial application in a steepland planted forest in New Zealand

New Zealand Journal of Forestry Science

Table 2 Characteristics of the trial catchment^a

	Catchment area (ha)	Area (ha) sprayed^b	Catchment area sprayed (%)	Unplanted (ha)	<1-year-old P. radiata (ha)^b	1–2-year-old P. radiata (ha)	28–29-year-old P. radiata (ha)
Site	Catchment area (ha)	Area (ha) sprayed^b	Catchment area sprayed (%)	Unplanted (ha)	<1-year-old P. radiata (ha)^b	1–2-year-old P. radiata (ha)	28–29-year-old P. radiata (ha)
W1^c	12	7	57	0	11	0	1
W2	62	12	19	10	18	18	15
W3	193	30	16	68	43	32	50

^aData provided by forest company GIS and forest information databases
^bAll herbicide application was in the areas of <1-year-old P. radiata. NB: Because of the 30-m ‘no-spray’ zone along the stream margins (Fig. 1), the area of 1-year-old pine sprayed with herbicides is less than the total area
^c W water-monitoring point