施肥对红壤稻田硫素演变及供硫能力的影响

研究了进行 15年的不同施肥结构对红壤稻田土壤硫素肥力演变和对土壤供硫能力的影响。结果表明 ,不同施肥结构明显影响土壤全硫、有机硫、无机硫和供硫潜力 (无机硫加部分有机硫 ,40℃KCl浸提 )的演变时间进程以及土壤有机硫的潜在矿化量、矿化常数和矿化半减期 ,稻草还田和有机肥施用有利于土壤硫的积累 ,提高土壤供硫能力 ;连续盆栽幼苗试验结果表明 ,作物吸硫量以稻草还田区 有机肥加化肥区 全化肥区 无肥区 ,与土壤全硫、供硫潜力及土壤硫潜在矿化量顺序一致

Effect of fertilization constitution on sulfur fertility development and supplied S ability of red paddy soil

Based on long term experiment of fertilization, analysis soil sulfur fertility factor developing with time and supplied S ability of red paddy soil with different fertilization constitution. The result showed that fertilization constitution obviously affected developing with time of total S, organic S, inorganic S and inorganic S plus fraction organic S (40 ℃ KCl extracted) of soil, and sulfur mineralization potential, mineralization rate constant and half time for S mineralization. Applied straw and organic manure with chemical fertilizer helped to soil S accumulate in soil and increase supplied S ability. Under greenhouse conditions, arranged order of treatments was straw return to field>organic manure plus inorganic fertilizer>total inorganic fertilizer>control, according S uptake from different soil treated by different fertilization constitution. It was as same as orders of soil total S, inorganic S plus fraction organic S and sulfur mineralization potential.