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Effects of different P sources on plant growth in sand culture. Wild-type (WT; far left) and transgenic soybean (next three plants) were grown for 30 d in sand culture with different P sources. A, N-P treatment (no P addition). B, K-P treatment (100 mg P kg−1 sand with KH2PO4). C, Phy-P treatment (100 mg P kg−1 sand with phytate).
