Effects of reduced pesticide use on flora and....., Danish Environmental Protection Agency

Effects of reduced pesticide use on flora and fauna in agricultural fields

Table 3.5.
The estimated mean dry masses of relevant bird prey (based on known skylark prey (Elmegaard et al. 1999) and the estimated mean dry masses of all arthropods collected in the three different crops. The numbers given are least squares estimates of the mean dry mass, of 5-7 samples per year in the period late May - mid August. In cereals the estimates are "mg/3 m²" and in beets "mg/1.5 m² plants". The estimates are followed by 95% confidence intervals. P-values for test of significance of the factor "dosage" are given (**: p<0.01). Significant differences (p<0.05) between the different dosages are found by paired t-tests and are indicated by different letters.

Crop		Normal dosage	Half dosage	Quarter dosage	p-value
Barley mg/3 m²	Food items	293.3 a [ 261.3; 329.3]	296.5 a [ 264.0; 332.8]	381.7 b [ 340.0; 428.5]	0.0031**
Barley mg/3 m²	Total	508.0 a [ 451.4; 571.7]	528.1 a [ 469.3; 594.3]	652.4 b [ 579.7; 734.2]	0.0093**
Wheat mg/3 m²	Food items	356.8 [ 299.7; 424.8]	408.2 [ 342.8; 485.9]	404.1 [ 339.4; 481.0]	0.4678 ns
Wheat mg/3 m²	Total	699.8 [ 591.7; 827.7]	785.8 [ 664.4; 929.3]	821.9 [ 695.0; 972.0]	0.3754 ns
Beets mg/1.5 m²	Food items	117.2 [ 98.0; 141.3]	112.5 [ 93.6; 135.0]	125.4 [ 104.4; 150.5]	0.6971 ns
Beets mg/1.5 m²	Total	251.1 [ 210.0; 300.2]	264.7 [ 221.4; 316.5]	291.6 [ 243.9; 348.6]	0.4839 ns