Chất lượng của nền và than bùn cho Cây trồng ở Containers Vật liệu than bùn được sử dụng rộng rãi trên các phương tiện truyền thông ngày càng tăng về vườn ươm và sản xuất hiệu ứng nhà kính. Đất canh tác của các lĩnh vực than bùn cũng như thu hoạch, xếp, sàng lọc, nghiền, và các hoạt động xử lý ảnh hưởng đến kích thước hạt phân phối và chất lượng than bùn mà không ảnh hưởng đến mức độ phân hủy. . | CHAPTER 4 Quality of Peat Substrates for Plants Grown in Containers Jean Caron and Louis-Marie Rivière CONTENTS Abstract I. Introduction II. Peat Substrate Quality Basic Properties A. Bulk Density B. Porosity C. Air and Water Storage D. Air Exchange E. Hydraulic Conductivity F. Wettability G. Cation Exchange Capacity and Peat Acidity H. Nutrient Availability I. Substrate Mineralization and Reorganization III. Peat Types and Substrate Quality IV. Stability and Recycling of Peat Substrates A. Stability of Peat Substrates B. Recycling of Peat Substrates C. Peat Extraction and Processing Technologies V. Conclusion Acknowledgments References 2003 by CRC Press LLC ABSTRACT Peat materials are widely used in growing media for nursery and greenhouse productions. Tillage of peat fields as well as harvesting piling screening crushing and handling operations influence particle size distribution and peat quality without influencing decomposition degree. Quality attributes of peat-base products are physical air-water storage and exchange and chemical pH salinity and nutrient content . Determination methods are briefly described. Total porosity air-filled porosity storage capacity for available water and container capacity are associated with peat degree of decomposition and botanical makeup. Pore tortuosity and gas diffusivity are more closely related to grain-size distribution and plant productivity than capacity criteria such as air-filled porosity and volume of available water. Structuring components to be combined with peat materials should increase gas diffusion while maintaining high amounts of available water. Nutrient availability is primarily related to substrate pH salinity and cation exchange capacity. Fibric and hemic Sphagnum peat and some herbaceous peat materials are used successfully in peat mixes. I. INTRODUCTION Nursery and greenhouse crops are grown in artificial mixes to avoid soilborne plant pathogens and maintain high transpiration rates. Peat alone or in .
