{"name": "土地、土壤与肥料", "children": [{"name": "不稳定结构", "en": "unstable structure", "superfield": "农学"}, {"name": "中性土", "en": "neutral soil", "superfield": "农学"}, {"name": "交换性盐基", "en": "exchangeable base", "superfield": "农学"}, {"name": "交换性钾", "en": "exchangeable potassium", "superfield": "农学"}, {"name": "交换量", "en": "exchange capacity", "superfield": "农学"}, {"name": "侵蚀土壤", "en": "eroded soil", "superfield": "农学"}, {"name": "保水能力", "en": "water retention capacity", "superfield": "农学"}, {"name": "入渗", "en": "infiltration", "superfield": "农学"}, {"name": "入渗率", "en": "infiltration rate", "superfield": "农学"}, {"name": "兰花苕子", "en": "bird vetch", "superfield": "农学"}, {"name": "共生固氮作用", "en": "symbiotic nitrogen fixation", "superfield": "农学"}, {"name": "农业土壤", "en": "agriculture soil", "superfield": "农学"}, {"name": "农业土壤水分特性", "en": "agricultural soil moisture characteristics", "superfield": "农学"}, {"name": "农业用地", "en": "agricultural land", "superfield": "农学"}, {"name": "农家肥", "en": "farmyard manure", "superfield": "农学"}, {"name": "农田生态系统", "en": "field ecosystem", "superfield": "农学"}, {"name": "农艺类型", "en": "agrotype", "superfield": "农学"}, {"name": "分次施肥", "en": "split application", "superfield": "农学"}, {"name": "包衣肥料", "en": "coated fertilizer", "superfield": "农学"}, {"name": "叶面施肥", "en": "foliar application", "superfield": "农学"}]}