Table 4 Sielianinov hydrothermal coefficient and description of the months in the 2012–2014 growing seasons22.

From: Biostimulants and herbicides a tool to reduce non-commercial yield tubers and improve potato yield structure

Month

Years

2012

2013

2014

Hydrothermal coefficient and description of the month (K)**

April

1.10—relatively dry

1.60—optimal

1.50—optimal

May

1.20—relatively dry

2.30—humid

2.30— humid

June

1.60—optimal

1.80—relatively humid

1.20—relatively dry

July

0.70—very dry

1.60—optimal

0.16—extremely dry

August

0.90—dry

0.30—extremely dry

1.90—relatively humid

September

0.27—extremely dry

2.70—very humid

0.62—very dry

April-September

0.95—dry

1.60—optimal

1.20—relatively dry

  1. **Description of the month was calculated according to formula: K = 10 P/ Σt, where: P—the sum of the monthly rainfalls in mm, Σt—monthly total air temperature > 0 °C. Ranges of values are classified as follows: up to 0.4: extremely dry; 0.41–0.7: very dry; 0.71–1.0: dry; 1.01–1.3: relatively dry; 1.31–1.6: optimal; 1.61–2.0: relatively humid; 2.01–2.5: humid; 2.51–3.0: very humid; over 3.0: extremely humid.
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