Twitchell Island is the site of an experiment being conducted by the U . S . Geological Survey to study whether growing tules and cattails on the sinking islands of the Sacramento Delta can reverse the soil loss caused by wind, rain and farming.
42.
Another 4 million hectares ( 9.88 million acres ) will be covered in the next five years, at a cost of 7.86 billion yuan ( dlrs 947 million ), to help stop water and soil loss and desertification, Forestry Minister Xu Youfang was quoted as saying.
43.
Removal of the native forest for cultivation and pastureland during the past 50 years has led to massive annual soil losses approaching 250 metric tonnes per hectare ( 112 tons per acre ) in some regions of the island, the largest amount recorded anywhere in the world.
44.
Another 4 million hectares ( 9 . 88 million acres ) will be covered in the next five years, at a cost of 7 . 86 billion yuan ( dlrs 947 million ), to help stop water and soil loss and desertification, Forestry Minister Xu Youfang was quoted as saying.
45.
For 2010, annual average soil loss by sheet, rill and wind erosion on non-federal US land was estimated to be 10.7 t / ha on cropland and 1.9 t / ha on pasture land; the average soil erosion rate on US cropland had been reduced by about 34 % since 1982.
46.
In one experiment, water runoff and soil loss on a 14 % slope was compared for rototilled ( RT ), no-till with corn stover mulch ( NTCMS ), no-till in CSM + birdsfoot trefoil living mulch ( NT-BFT ) and no till in CSM and crownvetch living mulch ( NT-CV ).
47.
The results indicated that the water runoff was 6, 350 L ha-1 for NT-BFT, 6, 350 L ha-1 NO-CSM, 5, 925 L ha-1 for NT-CV, and 145, 000 L ha-1 for RT . The soil loss for the RT was 14.22 t ha-1 while with the other treatments it was less than 0.5 tons ha-1.
