The flatter response curves of the extended data set was probably due to categorisation of
data, other varieties peaking either earlier or later than NCo376 and mild stress altering
peak response times. These effects could not be dealt with adequately because of the large
variation of the data in the extended data set. When designing chemical ripening
experiments, consideration should be given to parameters like variety, soil moisture status,
solar radiation and temperatures, that strongly influence sucrose accumulation. Sampling
procedures that reduce variation in data should also be considered.
• The possibility that thermal time, solar radiation or evapotranspiration could provide more
appropriate recommendations than the current schedules, should be further investigated.