Returning straw to soil
wheat straw returning soil
Returning of wheat straw to field
returning rice-straw to soil
Returning straw to field
returning straw to field directly
returning straw to land
returning wheat straw into field
straw returning to field
straw returning to the soil
stubble returning to soil
Total wheat straw returning
straw-returning to field
air-conditioning system with partial cooling air returning to room
cropland returning to forest
cutting-and-returning-to-field