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首页> 外文期刊>Plant and Soil >Evaluation of laboratory-based measures of soil mineral nitrogen and potentially mineralizable nitrogen as predictors of field-based indices of soil nitrogen supply in potato production
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Evaluation of laboratory-based measures of soil mineral nitrogen and potentially mineralizable nitrogen as predictors of field-based indices of soil nitrogen supply in potato production

机译：评估基于实验室的土壤矿质氮和可能矿化的氮作为马铃薯生产中基于土壤的氮供应指标的预测指标

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摘要

Accurate estimation of soil nitrogen (N) supply in the field is required to optimize fertilizer N management and to minimize environmental N losses in humid environments. Laboratory-based measures of N availability were evaluated as predictors of field-based indices of soil N supply within potato production systems. Pre-plant soil samples (0–15 cm) were collected from a series of forty treatments in established potato trials located in Atlantic Canada and Maine, USA. Total plant N uptake at topkill with no fertilizer N applied (PNU0N), PNU0N plus soil mineral N to 30 cm depth at harvest and relative yield were considered as field-based indices of soil N supply. The potentially mineralizable N (N0) was determined by aerobic incubation at 25°C and periodic leaching for 24 weeks. A series of laboratory-based measures of soil N supply were measured in soil samples. Pre-plant soil nitrate or total mineral N at 0–30 cm depth was the best single predictor of PNU0N (r = 0.67 and 0.71, respectively) and relative yield (r = 0.58 and 0.61). The ultraviolet absorbance of 0.01 M NaHCO3 extract at 205 nm (NaHCO3-205) was suitable as a predictor of PNU0N and relative yield in each growing season, however, the relationship between this parameter and PNU0N or relative yield varied somewhat among years. A combination of pre-plant mineral N plus N mineralized in the first 2 weeks period of incubation after re-wetting is proposed as a more robust measure of N availability compared with use of mineral N alone.
机译：需要精确估算田间土壤氮（N）的供应量，以优化肥料氮的管理并最大程度减少潮湿环境中环境氮的损失。评价了基于实验室的氮素供应量，以此作为预测马铃薯生产系统中土壤氮素供应量基于田间指标的指标。在位于加拿大大西洋和美国缅因州的成熟马铃薯试验中，从一系列四十种处理中收集了种植前的土壤样品（0-15厘米）。在收获时不施用肥料（PNU0N ），PNU0N 加上土壤矿质氮（最高收获深度和相对产量）的最高杀伤力下的植物总氮吸收量被认为是田间土壤氮素供应的指标。潜在可矿化的N（N0 ）是通过在25°C下进行好氧培养并定期浸出24周来确定的。在土壤样品中测量了一系列基于实验室的土壤氮供应量。在0–30 cm深度处，种植前土壤硝酸盐或总矿质氮是PNU0N的最佳单一预测指标（分别为r = 0.67和0.71）和相对产量（r = 0.58和0.61）。 0.01M NaHCO3 提取物在205 nm处的紫外线吸收（NaHCO3 -205）适合预测PNU0N 和每个生长季节的相对产量，但是，该参数之间的关系和PNU0N 或相对产量随年份有所不同。与单独使用矿物N相比，建议将植物前矿物质N +在重新润湿后孵育的前两周中矿化的N的组合作为更有效的N有效性度量。

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