优质新中粳苏粳815氮肥用量和分蘖期施用方式的研究
우질신중갱소갱815담비용량화분얼기시용방식적연구
On Amount of Nitrogen Fertilizer Applied in New Variety Sujing No.815 of Middle-season Jing Rice and Fertilization Method in Tillering Stage
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