Farmers of forty centuries; or, Permanent agriculture in China, Korea and Japan . Nara Experiment Station, andan exterior of one at the Nara Station is given in Fig. 101. This compost house is designed to serve 2| acres. Its floor is12 by 18 feet, rendered water-tight by a mixture of clay, limeand sand. The walls are of earth 1 foot thick, and the roof isthatched with straw. Its capacity is 16 to 20 tons, having acash value of 60 yen, or $30. In preparing the stack, materialsare brought daily and spread over one side of the compost flooruntil the pile has attained a height of 5 feet. After 1 f
Farmers of forty centuries; or, Permanent agriculture in China, Korea and Japan . Nara Experiment Station, andan exterior of one at the Nara Station is given in Fig. 101. This compost house is designed to serve 2| acres. Its floor is12 by 18 feet, rendered water-tight by a mixture of clay, limeand sand. The walls are of earth 1 foot thick, and the roof isthatched with straw. Its capacity is 16 to 20 tons, having acash value of 60 yen, or $30. In preparing the stack, materialsare brought daily and spread over one side of the compost flooruntil the pile has attained a height of 5 feet. After 1 foot in depthhas been laid and firmed, 1 -2 inches of soil or mud is spread over TOTAL FERTILIZERS USED 187 the surface and the process repeated until full height has beenattained. Water is added sufficient to keep the whole saturatedand to maintain the temperature below that of the body. Afterthe compost stacks have been completed they are permitted tostand five weeks in summer, seven weeks in winter, when theyare forked over and transferred to the opposite side of the ih^tKfH ) \ I \ _^|» FlO. 100. - Section of chart issued by the Nara Experiment Station, ilhistratingconstruction of compost house; upper section sliowa elevation; middle portionis a cross section, and the lower shows floor plan. If we state in round numbers the total nitrogen, phosphorusand potassium thus far enumerated which Japanese farmers applyor return annually to their 20,000 or 21,000 square miles of culti-vated fields, the case stands 385,214 tons of nitrogen, 91,656 tonsof phosphorus, and 255,778 tons of potassium. These values are 188 THE UTILIZATION OF WASTE only approximations and do not include the large volume andvariety of fertilizers prepared from fish, which have long beenused. Neither do they include the very large amount of nitrogenderived directly from the atmosphere through their long, exten-sive and persistent cultivation of soy beans and other , from 1903 to 19
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagriculture, bookyear
