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以污泥为原料制备平均分子量为5 000道尔顿以内的蛋白肽,并以有机肥、复合肥和尿素为对照,研究蛋白肽对土壤微生物种群数量、土壤酶活性以及对所种植的十字花科植物红菜薹的生理指标影响效应,结果表明,在施加相同含氮量(0.1 g N)的条件下,污泥蛋白肽实验组的土壤微生物种群数量最高,达到39.28×107个/g,比最低的尿素实验组(10.38×107个/g)高73.6%;在对土壤酶活方面,污泥蛋白肽实验组的脲酶活性比所有对照组高,达到9.82 mg/(g·h),最低是复合肥实验组,其脲酶活性为6.54 mg/(g·h);利用蛋白肽所种植红菜薹的生物量分别是有机肥、复合肥和尿素的14.1倍、8倍和3.1倍,并且通过计算所施氮量与植株总氮量的比值——氮转化率,得出蛋白肽所种植红菜薹植株的氮转化率达到222.3%。这进一步表明蛋白肽是一种植物速效并且高效肥料。
Sludge was used as raw material to prepare protein peptide with average molecular weight of 5,000 Daltons. Organic manure, compound fertilizer and urea were used as control to study the effect of peptide on soil microbial population, soil enzyme activity, The results showed that the amount of soil microbial population in the experimental group was the highest (39.28 × 107 / g) under the same nitrogen content (0.1 g N) Which was 73.6% higher than that of the lowest urea test group (10.38 × 107 cells / g). In terms of soil enzyme activity, the urease activity of the experimental group was higher than all the control groups, reaching 9.82 mg / (g · h) The lowest was compound fertilizer experimental group, and the urease activity was 6.54 mg / (g · h). Biomass of Phyllostachys galli cultivated with protein peptide was 14.1 times, 8 times and 3.1 times that of organic fertilizer, compound fertilizer and urea respectively, And by calculating the nitrogen application rate and the total nitrogen ratio of plant - nitrogen conversion rate, we conclude that the nitrogen conversion rate of Rhizoma Phytolacca plantation reached 222.3%. This further indicates that the protein peptide is a fast and efficient plant fertilizer.