From 2002 to 2003, a field experiment on corn of Dianfeng 4 was carried out on the farm of Yunnan Agricultural University to study the photosynthesis indices for various tillage.
2002～2003年在云南农业大学农场采用滇丰4号玉米种，开展了不同耕作措施的玉米光合指标的研究。
From 2002 to 2003, a field experiment on corn of Dianfeng 4 was carried out on the farm of Yunnan Agricultural University to study the photosynthesis indices for various tillage.
2002～2003年在云南农业大学农场采用滇丰4号玉米种，开展了不同耕作措施的玉米光合指标的研究。
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