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采用环境扫描电镜和红外光谱观察和解析凝胶型保水缓释氮肥的形貌及物理结构和化学特征。结果表明,保水缓释氮肥干样品相结构是一个整体不均匀而局部较均匀的凝胶。保水缓释氮肥凝胶吸水膨胀体为透明的水凝胶,具有网络结构和孔隙,这是其存贮水分的物理空间。盐分影响或破坏保水缓释氮肥的物理和化学结构,破坏程度为氯化钠小于氯化钙,氯化钙对保水缓释氮肥网络物理结构的破坏用蒸馏水洗涤几乎不可逆转。因此,提高保水缓释氮肥的耐盐性是提高保水缓释氮肥吸水倍率的重要因素。
Environmental scanning electron microscopy and infrared spectroscopy were used to observe and analyze the morphology, physical structure and chemical characteristics of the gelled water-retaining slow-release nitrogen fertilizer. The results showed that the dry phase of water-retaining and slow-release nitrogen fertilizer was a non-uniform and locally uniform gel. Water Retardant Nitrogen gel water-absorbing swelling is a transparent hydrogel with network structure and pores, which is its physical space for storing water. Salinity affects or destroys the physical and chemical structure of water-retaining and slow-release nitrogen fertilizers. The extent of damage is that sodium chloride is less than calcium chloride, and the damage caused by calcium chloride to the network structure of water-retaining and slow-release nitrogen fertilizer is almost irreversible when washed with distilled water. Therefore, increasing the salt-tolerance of water-retaining and slow-release nitrogen fertilizer is an important factor to increase the water absorption rate of water-holding and slow-release nitrogen fertilizer.