ditch-burying straw returning
no-tillage with straw returning
Returning straw into field
Returning straw into soil
Returning straw to field
returning straw to field directly
returning straw to land
Returning straw to soil
Rice straw returning into field
Rice straw returning methods
straw returning
稻草还田
秸秆还田
茎秆还田
秸秆还田试验
秸秆还回
桔秆还田
Straw returning machine
straw returning to field
straw returning to the soil
Total wheat straw returning
wheat straw returning soil