Abstract—Unused lands in northwest Russia are quickly overgrown by wood and shrub vegetation (WSV). Their effective development for forage is associated with the search for optimal safe solutions both for processing of this vegetation and for restoring fertility of sod-podzolic soils. The goal of the study was to evaluate the effectiveness of new technological options for fertility restoration of sod-podzolic soils on developed bushed fallow lands using the products from processing of above-ground biomass of trees and shrubs and cheap local ameliorants. The object of the study was the bushed fallow land developed for fodder crop rotation. A sharp decrease in the yield of annual grasses (up to five times) against the background of introducing the wood and shrub vegetation processing products into soil was established. Meanwhile, the content of raw protein and ash substances in the green mass of herbs decreased by 8–13%. The use of a complex of chemical ameliorants allowed not only to level these inevitable costs of cultural reclamation but also to bring the yield of green grass in the best options of the experiment to 37–44 t/ha. According to the experiment, the average yield from the ameliorant complex was 79% in direct action and 27% in the aftereffect. The best performance is achieved with the use of ameliorants with biochar, which reduced the CO₂ release into the atmosphere by five times.

中文翻译：

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闲置土地的二次开发

摘要—俄罗斯西北部的未利用土地很快就被木材和灌木植被（WSV）所覆盖。它们对牧草的有效开发与寻找最佳的安全解决方案有关，既可以处理这种植被，又可以恢复草皮土壤的肥力。这项研究的目的是评估新技术选项对发达灌木丛休耕地上的草皮土壤肥力恢复的有效性，该技术使用的是树和灌木的地上生物量加工产品以及廉价的当地改良剂。研究的目的是为饲料作物轮作开发的灌木丛休耕地。在将木材和灌木植物加工产品引入土壤的背景下，一年生禾草的产量急剧下降（高达五倍）。与此同时，草药绿色块中粗蛋白和灰分物质的含量降低了8-13％。使用复杂的化学改良剂不仅可以平整这些不可避免的文化垦殖成本，而且可以使最佳实验中的绿草产量达到37-44吨/公顷。根据实验，直接作用的改善复合物的平均收率为79％，后效的平均收率为27％。通过将修饰剂与生物炭配合使用可达到最佳性能，从而减少了二氧化碳 直接作用的改善复合物的平均收率为79％，后效的平均收率为27％。通过与生物炭一起使用改良剂可达到最佳性能，从而减少了二氧化碳 直接作用的改善复合物的平均收率为79％，后效的平均收率为27％。通过与生物炭一起使用改良剂可达到最佳性能，从而减少了二氧化碳₂释放到大气中五倍。