For reducing soil carbon (C) depletion and increasing its stocks in soil through sequestration, it is necessary to develop identification, standardization, and adoption of some effective nutrient management practices, especially related to nitrogen management. In this study, various modes of N input were tried and the best mode (MRPU-2S, i.e., mid-rib placement upper to corms in two splits) that restricted SOC depletion and kept SOC above a threshold level of 1%, was suggested as suitable for saffron (Crocus sativus) cultivation in temperate soils. Under this treatment a significantly higher yield (1.92 kg ha⁻¹) as well as more apocarotenoids (crocin and safranal) content, was noticed. Threshold values of surface SOC stock (26.64 Mg ha⁻¹) above which C sequestration values moved to a positive coordinate plane were noted. Through this investigation, we identified a great C sequestration potential for MRPU-2S treatment for improving declining SOC stocks in saffron growing soils of temperate regions. Although the our study has been carried out in saffron growing soils of a temperate region the outcomes and recommendations generated are probably applicable for other crops, soils and climates too.

中文翻译：

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通过修改土壤养分氮输入来限制土壤有机碳的消耗

为了通过封存减少土壤碳 (C) 消耗并增加其在土壤中的储量，有必要发展识别、标准化和采用一些有效的养分管理实践，尤其是与氮管理相关的实践。在这项研究中，尝试了 N 输入的各种模式，并建议了限制 SOC 消耗并将 SOC 保持在 1% 阈值水平以上的最佳模式（MRPU-2S，即中肋放置在两个分裂中的球茎上部）适合在温带土壤中种植藏红花（Crocus sativus）。注意到在这种处理下显着更高的产量（1.92 kg ha ^-1）以及更多的类胡萝卜素（藏红花素和番红花醛）含量。地表 SOC 储量阈值 (26.64 Mg ha ^-1) 上面的 C 封存值移动到正坐标平面被注意到。通过这项调查，我们确定了 MRPU-2S 处理的巨大 C 封存潜力，以改善温带地区藏红花种植土壤中不断下降的 SOC 储量。尽管我们的研究是在温带地区的藏红花种植土壤中进行的，但产生的结果和建议可能也适用于其他作物、土壤和气候。