tandem disc harrow
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- intensive farming method
- egg character
- achromatic figure
- ecological climatology，ecoclimatology
- Open cultivation
- Reducing substances
- in vitro digestibility
- fertilization time
- antracole
- water supplying system
- autumn planting
- euryphagous,polytrophic
- TCA cycle
- excreta of accessory sex gland
- abortive transduction
- colitis
- long pistillate
- shoot harvesting
- first half period of growth
- Soil surface mulching