Abstract

The effect of commercial humic product Lignohumate^® on the biological activity of Latosol under long-term agricultural use with application of pesticides at the Bali Island (Indonesia) was evaluated in model experiments. It was shown that the application of lignohumate in a concentration gradient 0.025–2.5 mg/g resulted in increase in soil microbial community respiration rate by 10–30%, proportionally to the rate applied. As the application rate of Lignohumate increased, a significant threefold increase of nitrogen fixation intensity caused by the activation of bacteria of the Oxalobacteriaceae family was observed. In general, the bacterial community of Latosol consisted of more than 85% of the representatives of four phyla: Proteobacteria, Firmicutes, Chloroflexi, and Acidobacteria. Lignohumate at application rates higher than 0.025 mg/g promoted an increase of methane formation, whereas gaseous nitrogen losses due to denitrification reduced. An important practical conclusion on the reduction of a toxic effect of pesticides in the presence of lignohumate and its positive effect on soil biological activity and nitrogen balance in the Latosol under intensive agricultural use was made.

中文翻译：

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木质素酸盐对印度尼西亚巴厘岛的土壤生物活性的影响

摘要

商业腐殖酸产品LIGNOHUMATE的影响^®在模型试验中，评估了在巴厘岛农业（印度尼西亚）上长期施用农药后Latosol的生物活性的变化。结果表明，木质素腐殖酸盐的浓度梯度为0.025–2.5 mg / g时，土壤微生物群落呼吸速率增加了10–30％，与施用速率成正比。随着木质素草酸盐的施用量增加，观察到由草杆菌科细菌活化引起的固氮强度显着增加了三倍。通常，Latosol的细菌群落由以下四种门的代表的85％组成：变形杆菌，Firmicutes，Chloroflexi和Acidobacteria。木质素腐殖酸盐在高于0.025 mg / g的施用量下促进甲烷形成的增加，而反硝化导致的气态氮损失减少了。在木质素腐殖酸盐存在下，降低农药的毒性作用及其对集约化农业生产下Latosol中土壤生物学活性和氮平衡的积极影响，得出了重要的实用结论。