Changes in dry matter, protein percentage and organic matter of soybean-oat and groundnut-oat intercropping in different growth stages in Jilin province, China حسب Yang YONG, Yue-gao HU, Mohamad Hesam SHAHRAJABIAN, Chang-zhong REN, Lai-chun GUO, Chun-long WANG, Zhao-hai ZENG

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