免耕条件下川香优9838氮磷钾吸收规律与氮肥合理施用研究
면경조건하천향우9838담린갑흡수규률여담비합리시용연구
Study on absorption characteristics of nitrogen ,phosphorus and potassium by rice cultivar Chuanxiangyou 9838 and its proper N application rate
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