ABSTRACT

Manure nutrient management can affect soil carbon (C) and nitrogen (N) fractions. The objective of this study was to determine the effects of long-term manure and mineral fertilizer applications on C and N fractions. This study was conducted for 11 years under corn and soybean rotation. The study rates included low manure (LM (4,194 kg ha⁻¹), based on the crop’s phosphorus (P) requirement), medium manure (MM (8,081 kg ha⁻¹), based on the crop’s N requirement), high manure (HM (16,162 kg ha⁻¹), two times the rate of MM), medium fertilizer (MF (204 kg N ha⁻¹), recommended), high fertilizer (HF (224 kg N ha⁻¹), high), and control. Soil samples were collected to measure C and N fractions. HM recorded higher particulate C (8%) at 0–10 cm and higher dissolved C (26%) at 10–20 cm compared to LM. All manure rates had higher permanganate oxidizable C compared to mineral fertilizer rates. Carbon management index was higher under MM compared to the HF (17%) and MF (33%). This study suggests that manure application (16,162 kg ha⁻¹ rate and even 8,081 kg ha⁻¹ and 4,194 kg ha⁻¹ rates in some cases) can enhance C and N pools compared to mineral fertilizer application.

摘要

粪便养分管理会影响土壤碳 (C) 和氮 (N) 部分。本研究的目的是确定长期施用粪肥和矿物肥料对 C 和 N 组分的影响。这项研究在玉米和大豆轮作下进行了 11 年。研究比率包括低肥（LM (4,194 kg ha ^-1 )，基于作物的磷 (P) 需求）、中肥（MM (8,081 kg ha ^-1 )，基于作物的 N 需求）、高肥（ HM (16,162 kg ha ^-1 )，两倍于 MM)，中肥（MF (204 kg N ha ^-1 )，推荐），高肥（HF (224 kg N ha ^-1), 高), 和控制。收集土壤样品以测量 C 和 N 分数。与 LM 相比，HM 在 0-10 cm 处记录了更高的颗粒 C (8%)，在 10-20 cm 处记录了更高的溶解 C (26%)。与矿物肥料比率相比，所有肥料比率都具有更高的高锰酸盐可氧化 C。与 HF（17%）和 MF（33%）相比，MM 下的碳管理指数更高。这项研究表明，与矿物肥料施用相比，施肥（在某些情况下施用 16,162 kg ha -1 和 8,081 kg ha -1 和 4,194 kg ha -1 施用量）可以提高^C和^N库^。