Kc and period adaptation for local meteorological condition

The kc table is realatively difficult to use and especially to adapt manualy to local conditions.

• Start (Sowing) date could be link to a degre day threshold

• Kc mid could be adapt to meteorological data according to FAO-56 equation 62 (page 121) → https://www.professormendoncauenf.com.br/wp-content/uploads/2021/03/ag_fao_56_ingles.pdf