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This study investigated yield advantage of intercropping systems and compared N, P and K uptake by wheat, maize, and soybean in two field experiments in Gansu province. At Baiyun site the field experiment compared two P levels (0 and 53kgPha -1 ), two planting densities for wheat and maize, and three cropping treatments (wheat/maize intercropping, sole wheat and sole maize). The design...
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