Multiyear analysis of the dependency of the planting date on rainfall and soil moisture in paddy fields in Cambodia, 2003–2019

Abstract The dependencies of the planting date on rainfall and soil moisture in paddy fields Cambodia were analyzed to quantify farmers’ empirical knowledge regarding their decision date. Remote sensing data from multiple satellites covering 2003–2019 period analyzed. dates rain-fed paddies ranged April August, with large spatial variations year-to-year fluctuations. In years when was suppressed May, extensively enhanced June August compared normal years, vice versa. Over northeastern side Tonle Sap Lake south Phnom Penh city, areas planted May found have positive correlations moisture, suggesting that wetter-than-average conditions encouraged farmers plant earlier season. contrast, this relationship unclear western Lake, where amounts larger throughout year than other Cambodia. region, between area water availability either or even slightly negative August. Since more frequent dry spells been detected after onset rainy season recent further studies disseminations potential changes are important for agronomic adaptation under climate change.