Just before reaching Hongo there were considerable areas thrown into long narrow, much-raised, east and west beds under covers of straw matting inclined at a slight angle toward the south, some two feet above the ground but open toward the north. What crop may have been grown here we did not learn but the matting was apparently intended for shade, as it was hot midsummer weather, and we suspect it may have been ginseng. It was here, too, that we came into the region of the culture of matting rush, extensively grown in Hiroshima and Okayama prefectures, but less extensively all over the empire. As with rice, the rush is first grown in nursery beds from which it is transplanted to the paddies, one acre of nursery supplying sufficient stock for ten acres of field. The plants are set twenty to thirty stalks in a hill in rows seven inches apart with the hills six inches from center to center in the row. Very high fertilization is practiced, costing from 120 to 240 yen per acre, or $60 to $120 annually, the fertilizer consisting of bean cake and plant ashes, or in recent years, sometimes of sulphate of ammonia for nitrogen, and superphosphate of lime. About ten per cent of the amount of fertilizer required for the crop is applied at the time of fitting the ground, the balance being administered from time to time as the season advances. Two crops of the rush may be taken from the same ground each year or it is grown in rotation with rice, but most extensively on the lands less readily drained and not so well suited for other crops. Fields of the rush, growing in alternation with rice, are seen in Fig. 45, and in Fig. 227, with the Government salt fields lying along the seashore beyond.
With the most vigorous growth the rush attain a height exceeding three feet and the market price varies materially with the length of the stems. Good yields, under the best culture, may be as high as 6.5 tons per acre of the dry stems but the average yield is less, that of 1905 being 8531 pounds, for 9655 acres, The value of the product ranges from $120 to $200 per acre.