Paper production is among the industrial branches generating significant amounts of waste. Organic waste from paper manufacturing is mostly used in gardening and agriculture or converted for energy purposes, while inorganic waste, including green liquor dregs (GLD), is usually deposited on landfills. GLD has a highly alkaline reaction, suggestive of its possible utilization for land reclamation or for improvement of soil's physico‐chemical properties. The research results originate from a pot experiment with maize as the test plant. GLD was added to soil in doses 10–40 t ha⁻¹. The trials consisted of two series: with and without tree bark (TB). GLD contributed to neutralization of the soil's acidic pH, enrichment of the sorption complex with alkaline cations, and to greater salinity of the soil. In the series with TB, it is demonstrated that GLD led to a decrease in the soil content of total organic carbon; while the content of total nitrogen increased, the C:N ratio is considerably narrowed. In response to GLD, the greenness of leaves significantly improves, but this does not translate into an increase in the yield of plants. Regarding the chemical composition of plants grown in soil treated with elevated GLD doses, the content of N and Na is demonstrably higher, although no such effect is discernible in the case of P and K. For the environment, safe doses of the applied waste, not causing significant deterioration of soil properties or depressing crop yields, are 10 and 20 t GLD ha⁻¹.

中文翻译：

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造纸废料对土壤理化性质，作物产量和植物化学成分的影响

造纸是产生大量废物的工业分支之一。造纸过程中产生的有机废物主要用于园艺和农业，或出于能源目的进行转化，而无机废物（包括绿茶渣）通常沉积在垃圾填埋场。GLD具有高度碱性的反应，提示其可能用于土地开垦或改善土壤的理化性质。研究结果来自于以玉米为试验植物的盆栽试验。GLD以10–40 t ha ^-1的剂量添加到土壤中。试验包括两个系列：有和没有树皮（TB）。GLD有助于中和土壤的酸性pH，吸收复合物和碱性阳离子的富集，并提高土壤的盐度。在与结核病有关的系列中，证明了GLD导致土壤中总有机碳含量的减少；当总氮含量增加时，C：N比明显变窄。响应GLD，叶子的绿色度显着提高，但这并没有转化为植物产量的增加。关于用高剂量GLD处理过的土壤中生长的植物的化学组成，虽然N和Na的含量在P和K情况下无法观察到，但N和Na的含量明显更高。对于环境，安全剂量的施用废物，^-1。