Grid Sampling: Point vs. Random

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Presentation transcript:

Grid Sampling: Point vs. Random Precision Agriculture February 2, 2001

Grid Sampling

Grid Sampling

Cell-random STP

Soil test pH Area ave =5.9; CV = 11 Pt. ave = 6.0; CV = 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Soil test pH Area ave =5.9; CV = 11 Pt. ave = 6.0; CV = 11

Lime requirement Area ave =0.81; CV = 40 Pt. ave = 0.64; CV = 58 1 2 3 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Lime requirement Area ave =0.81; CV = 40 Pt. ave = 0.64; CV = 58

Soil test-P Area ave = 139; CV = 55 Pt. ave = 144; CV = 51 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Soil test-P Area ave = 139; CV = 55 Pt. ave = 144; CV = 51

Soil test-K Area ave = 193; CV = 23 Pt. ave = 199; CV = 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Soil test-K Area ave = 193; CV = 23 Pt. ave = 199; CV = 25

Grid Sampling: Point vs. Random Summary: Generally, there is little difference between point and random sampling of a cell in a field-grid. Two of 24 cells differed by more than 100 % (STP) and are likely a result of high variability within the 1-acre cells. Either approach may be useful to identify “management zones”, where adjacent cells may be treated similar with production inputs. Spatial variability appears to decrease as resolution increases (e.g. size of area under inspection decreases)