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Cost of Carbon Sequestration of Main Plantation types in Guangxi 适宜与大棚基质栽培番茄套作的大蒜品种及其套播期研究 适宜与大棚基质栽培番茄套作的大蒜品种及其套播期研究 The Input-Output and Financial Maturity for Poplar Plantations Research on grazing management optimal model of typical steppe: a case study in Taipusi Banner, Inner Mongolia Effect of fertilization on yield, net income and soil environment in Qingdao protected vegetable production systems Analysis on the Economic Benefits of Six Forage Production Systems in Southwest of Sichuan Province