Variable List of Agriculture Statistics of P. R. China: 1949-1990 Chapter 6: Agricultural Input Statistics 150. Irrigated area and energy output, China, 1949-90 151. Irrigated area, by region and province, China, 1980-90 152. Number of farm machines, China, 1949-90 153. Farm machinery horsepower, by region and province, China, 1980-90 154. Mechanically tilled area, by region and province, China, 1980-90 155. Mechanically sown area, by region and province, China, 1980-90 156. Mechanically harvested area, by region and province, China, 1980-90 157. Draft animal yearend inventory, by region and province, China, 1979-90 158. Labor force in rural areas and townships, China, selected years, 1979-90 159. Chemical fertilizer production, China, 1949-90 160. Chemical fertilizer application, China, 1951-90 161. Total chemical fertilizer application, by region and province, China, 1980-90 162. Nitrogen fertilizer application, by region and province, China, 1980-90 163. Phosphorous fertilizer application, by region and province, China, 1980-90 164. Potassium fertilizer application, by region and province, China, 1980-90 165. Compound fertilizer application, by region and province, China, 1980-90 166. Cultivated area suffering serious damage from natural disaster, by region and province, China, 1983-90