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'Hah's Land' Soil conditioner contains not only bio-active Chitosan, Specific protein, OS-Ca2+, but also trace elements such as :Mg, Fe, B, Zn, Mn and Cu which is essential to the growth of crops. The micro pore size structure of oyster shell functions in forming granular structure for the soil, which could supply a better envirnment condition for the root growth of crops and improve crops, absorption ability of nutrient. It also can enhance the growth of crops and improve crops , absorption ability of nutrients. The use of the product can upgrade fertilizer efficienty and eliminate soil crusting due to using too much chemical fertilizer; Meanwhile it can restrain reproduction of harmful fungi and enhance growth of useful fungi.