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	Soil nitrogen operation demonstration video/soil nutrient detector (刘奎秀) View
	Fresh crop nitrate nitrogen nutrient detection operation demonstration video HM-GT3(鲜作物硝态氮) (刘奎秀) View
	Dry plant total nitrogen nutrient detection operation video（干植株全氮操作） (刘奎秀) View
	Soil phosphorus detection operation video / soil nutrient detector operation steps (刘奎秀) View
	Demonstration teaching of soil nutrient and organic matter detection 土壤有机质检测示范 (刘奎秀) View
	Operation video for Soil Nutrient tester (Henan Oceanus) View
	Dried plant total phosphorus nutrient detection operation demonstration video HM-GT3 (干植株全磷) (刘奎秀) View
	Determination of Available Nitrogen Content in the Soil by Kjeldahl Method (ritesh kumar nirmalkar) View
	Operation video of soil trace element detection instrument to detect phosphorus 土壤养分磷检测操作视频 (刘奎秀) View
	Highly intelligent soil nutrient detector HM-GT80 detects soil manganese (GT80测土壤锰) (刘奎秀) View