【正文】 .......................................................................................................58 5． 4 氯離子的測定 —— 硝酸銀滴定法 .......................................................................................................................... 60 2 5． 5 硫酸根的測定 .............................................................................................................................................................. 62 A 硫酸鋇比濁法 ................................................................................................................................................................62 B EDTA 間接滴定法 ..........................................................................................................................................................64 第六章 土壤有機(jī)質(zhì)的測定 ................................................................................................................................................. 66 油浴加熱重鉻酸鉀氧化 —— 容量法 ................................................................................................................................. 66 第七章 土壤氮的測定 .......................................................................................................................................................... 69 7． 1 土壤全氮的測定 —— 凱氏蒸餾法 ........................................................................................................................... 69 7． 2 土壤水解性氮的測定 —— 堿解擴(kuò)散法 ................................................................................................................... 72 7． 3 土壤硝態(tài)氮的測定 ................................................................................................................................................... 74 A 紫外分光光度法 .............................................................................................................................................................74 B 酚二磺酸比色法 ............................................................................................................................................................76 7． 4 土壤銨態(tài)氮的測定 ...................................................................................................................................................... 78 A 納氏試劑比色法 .........................................................................................................................................................78 B 靛酚藍(lán)比色法 ..............................................................................................................................................................80 第 八章 土壤磷的測定 ....................................................................................................................................................... 82 8． 1 土壤全磷測定 (氫氧化鈉熔融 —— 鉬銻抗比色法 ).............................................................................................. 82 8． 2 土壤有效磷測定 .......................................................................................................................................................... 84 A 碳酸氫鈉 提取 —— 鉬銻抗比色法（ OLSEN 法） .....................................................................................................84 B 鹽酸－氟化銨提取 —— 鉬銻抗比色法（ BRAY 法） ..............................................................................................87 第九章 土壤鉀的測定 ....................................................................................................................................................... 89 9． 1 土壤全鉀的測定 ........................................................................................................................................................... 89 A .堿熔 —— 火焰光度法或原子吸收分光光度法 ......................................................................................................89 B. 酸溶 — 火焰光度法或原子吸收分光光度法 ........................................................................................................91 9． 2 土壤緩效鉀的測定 (硝酸提取 —— 火焰光度法或原子吸收分光光度法 ) .................................................... 93 9． 3 土壤速效鉀的測定 (乙酸銨浸提 —— 火焰光度計(jì)或原子吸收分光光度計(jì)法 )............................................ 95 第十章 土壤有效中量元素的測定 ................................................................................................................................... 96 土壤有效硫的測定 (磷酸鹽－乙酸或氯化鈣浸提 —— 硫酸鋇比濁法 ) ........................................................... 96 10． 2 土壤有效硅的測定 .................................................................................................................................................... 98 A 178。L 1檸檬酸浸提 — 硅鉬藍(lán)比色法 ...........................................................................................................98 B. 乙酸緩沖液浸提－硅鉬藍(lán)比色法 ..........................................................................................................................100 第十一章 土壤有效微量元素的測定 ...........................................................................................................................102 11． 1 土壤有效態(tài)銅、鋅、鐵、錳的測定 ...................................................................................................................102 11． 2 土壤有效硼的測定 ..................................................................................................................................................104 A、甲亞胺－ H 比色法 .....................................................................................................................................................104 3 B 姜黃素比色法 ............................................................................................................................................................106 11． 3 土壤有效鉬的測定 ..................................................................................................................................................107 第十二章 植株的測定 .....................................................................................................................................................10