DETERMINATION OF A SUITABLE FORMULA FOR THE CALCULATION OF SUM GROWING DEGREE DAYS IN CUCUMBER

ISHS Acta Horticulturae 492: I International Symposium on Cucurbits

DETERMINATION OF A SUITABLE FORMULA FOR THE CALCULATION OF SUM GROWING DEGREE DAYS IN CUCUMBER

Authors:

S. AKINCI, K. ABAK

Keywords:

Sum growing degree days, cucumber, temperature

Abstract:
This study was conducted to determine the most suitable formula to calculate Sum Growing Degree Days (SGDD) in Cucumber for the periods between sowing and emergence, emergence and anthesis, anthesis and maturation, sowing and first harvest periods. In a two year trial, six cultivars were grown, starting from different sowing dates, and 96 equations were evaluated by using different combinations of daily ceiling (26,28,30 and 32°C) and base (0,8,9,10,11,12,14 and 16°C) temperatures originating from the following four main formulas:

SGDD= (Td-Tb);Td>Tb	Formula [1]
SGDD= (Tmax - Tmin)/2-Tb;(Tmax - Tmin)/2>Tb	Formula [2]
SGDD= (Td-Tb)xDaylength; Td>Tb	Formula [3]
SGDD= [(Tmax - Tmin)/2-Tb]xDaylength;(Tmax - Tmin)/2>Tb	Formula [4]

According to the results, Formula [ 1 ] with 8 or 12°C base temperatures were more suitable than the others in the calculation of SGDDs for all stages of growth.

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