Table 2 Number of observations of the nutrients for each of the four seasons, remained after the data cleaning.

From: Estimating nitrogen and phosphorus concentrations in streams and rivers, within a machine learning framework

Season

Winter

Spring

Summer

Autumn

Month

11-12-01

02-03-04

05-06-07

08-09-10

TN

1651

3090

3220

2254

TDN

678

1158

1237

875

NO3

1628

2761

3314

2238

TP

2595

4831

5860

4155

TDP

911

1651

2175

1412

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