Kalinga province in the Philippines produced over 159,000 metric tons of rice in 2008, accounting for one third of the region's annual harvest. Kalinga has some of the highest rice yields in the country at 4.72 tons per hectare due to good weather and planting conditions. However, farmers employ excessive chemical fertilizers and pesticides in order to maintain high hybrid rice production. This leads to issues like soil and water contamination, increased chemical residues in crops, and potential health effects. Barriers to greater organic fertilizer use include insufficient supply and slow decomposition of rice straw compost.