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以自制的新型非包膜有机无机缓释复合肥料(简称缓释复合肥,Slow-release compound fertilizer,SRCF)为供试材料,采用连续碱解还原扩散法研究氮素养分缓释过程。试验结果表明:1)以硼酸为吸收液时,NaOH浓度在0~0.1 mol/L范围内,SRCF在40 d时的氮素累积扩散率随碱的浓度增加而提高,且累积扩散率显著高于较高浓度碱液(0.52~mol/L NaOH)的处理效果;2)同一NaOH浓度下,0.1 mol/L H2SO4作吸收液时,SRCF的累积扩散率高于0.1 mol/L H3BO3作吸收液的累积扩散率;3)0.05和0.01 mol/L NaOH浓度下,SRCF的氮素扩散特征与土壤肥包培养下的氮素矿化过程具有较好的相似性,能充分指示有机无机缓释复合肥氮素形态的多样性。连续还原扩散法测定有机无机缓释复合肥氮素扩散释放的适宜条件为0.050~.1 mol/L NaOH为扩散介质,0.1 mol/L H2SO4为吸收介质,25℃恒温培养(40 d),在不同时段滴定吸收介质。
A new self-made non-coated organic-inorganic slow-release compound fertilizer (SRCF) was used as test material to study the process of nitrogen nutrient release by continuous alkali reduction and diffusion method. The results showed as follows: 1) When the concentration of NaOH was 0 ~ 0.1 mol / L with boric acid as absorbent, the cumulative nitrogen diffusivities of SRCF at 40 d increased with the increase of alkali concentration, and the cumulative diffusivities were significantly higher (0.52 ~ mol / L NaOH). 2) When the concentration of 0.1 mol / L H2SO4 was the same, the cumulative diffusivity of SRCF was higher than that of 0.1 mol / L H3BO3 ; (3) Under the concentrations of 0.05 and 0.01 mol / L NaOH, the nitrogen diffusion characteristics of SRCF had a good similarity with the nitrogen mineralization process under soil nutrient pad culture, which could fully indicate that organic and inorganic sustained-release complex Diversity of Nitrogen Forms. The optimum conditions for the determination of the diffusion and release of nitrogen from the organic-inorganic slow-release compound fertilizer by the continuous reduction and diffusion method were 0.050 ~ .1 mol / L NaOH as the diffusion medium and 0.1 mol / L H2SO4 as the absorption medium and incubated at 25 ℃ for 40 d, Titration of different time absorption media.