The utility model relates to a field system of fertile nutrient release law of survey slowly -releasing, including fertilizer soil pipe and blank soil pipe, nylon wire piece, tu gou, topsoil soil, fertilizer and mark the tablet awaits measuring, it has topsoil soil and awaits measuring fertilizer to fill in the fertilizer soil pipe, fill in the blank soil pipe have with fertilizer soil pipe in the topsoil soil of the same weight, the both ends of fertilizer soil pipe and blank soil pipe are lived with 80-120 purpose nylon wire pieces parcel, in one side that crops seedings was gone, apart from 10-50 centimetres crops, go parallel dig dark 10-40 centimetres, 15-20 centimetres wide two tu gou with the crops seeding, fertilizer soil pipe and blank native pipe are buried underground respectively in two native ditches, utilize the utility model discloses the available nutrient release law of survey more can reflect and supply fertile actual conditions, for evaluate its nutrient release law and whether judge with crop assimilate nutriment synchronism in the aspect of provide the scientific basis.