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1290s

Centuries: 12th century - 13th century - 14th century

Decades: 1240s 1250s 1260s 1270s 1280s - 1290s - 1300s 1310s 1320s 1330s 1340s

Years: 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299

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Soil pH

... of alkaline soils. Use of an inexpensive pH testing kit based on barium sulphate in powdered form, wherein a small sample of soil is mixed with water which changes colour ...