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- AgSpace[remove]7
- Triticum aestivum[remove]7
- Zea mays[remove]7
- application rate[remove]7
- corn6
- crop rotation4
- fertilizer application3
- grain yield3
- nitrogen fertilizers3
- Glycine max2
- continuous cropping2
- field experimentation2
- nitrate nitrogen2
- nitrogen2
- no-tillage2
- nutrient use efficiency2
- soil fertility2
- soil nutrients2
- soybeans2
- spring wheat2