Spatial and temporal distribution of soil inorganic nitrogen concentration in potato hills
Spatial and temporal distribution of soil inorganic nitrogen concentration in potato hills
复制标题
DOI：
10.4141/s02-061
复制
发表时间：
2003-05
影响因子：
1.7
通讯作者：
B. Zebarth;P. Milburn
中科院分区：
文献类型：
--
作者：
B. Zebarth;P. Milburn
本研究的目的是确定空间和时间变化的土壤无机氮浓度在马铃薯山，并讨论这种变化对土壤采样策略的影响。试验于1999年和2000年进行，采用4种处理：裸土不施氮肥，马铃薯作物不施氮肥，种植时施氮180 kg ha-1，或种植时施氮120 kg ha-1+培土时施氮60 kg ha-1。在种植后40天或更长时间内测量土壤NH 4 +-N浓度升高（高于背景值），因此应在季节内对土壤NO3−-N和NH 4 +-N进行采样。在种植和作物快速吸收氮之间有一段长达50天的时间，在此期间可能发生根区NO3−-N的损失。在此期间，分次施肥降低了NO3−-N损失的风险，但导致1999年块茎产量下降。土壤无机氮浓度的垂直变化很大，在马铃薯丘陵。
The purpose of this study was to determine the spatial and temporal variation in soil inorganic N concentration in the potato hill, and to discuss the implications of this variation on soil sampling strategies. The experiment was conducted in 1999 and 2000 using four treatments: bare soil with no N fertilizer applied, and a potato crop with no fertilizer N added, with 180 kg N ha-1 applied at planting, or with 120 kg N ha-1 applied at planting plus 60 kg N ha-1 applied at hilling. Elevated (above background) soil NH4+-N concentrations were measured for 40 or more days after planting, therefore in-season sampling should be done for both soil NO3−-N and NH4+-N. There was a period of up to 50 days between planting and rapid crop N uptake during which loss of NO3−-N from the root zone could occur. Split fertilizer application reduced the risk of NO3−-N loss during this time, but resulted in reduced tuber yield in 1999. Strong vertical variation in soil inorganic N concentration was measured in the potato hill...