Only mineral fertilizers applied or 0.32 (intergrated supply with mineral fertilizers and organic manure as rice straw, which was suitable to estimating the amount of OC in root and stubble kept in ploughhorizon.
两者的比值相当稳定，分别为0.30和0.32，这便于估算耕层的根茬有机碳量。
Zinc income and expenses balance in paddy field was a little deficit in nutrient pool of soil root horizon, which didn't decrease zinc content of soil ploughhorizon.
稻田土壤锌的收支平衡表现在土壤根层养分库中略有亏损，但这一亏损并不使土壤耕层锌含量降低。
Classification and fuzzy synthetic evaluation of soil nutrient at ploughhorizon in coastal region of north Jiangsu province