Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve
Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve
复制标题
使用氮稀释曲线改进草地氮吸收估计
DOI:
10.1007/s13593-015-0321-2
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发表时间:
2015
影响因子:
7.3
通讯作者:
Elsaesser
中科院分区:
文献类型:
--
作者:
Schellberg;Siebert;Elsaesser
The nitrogen (N) dilution curve is a useful tool for farmers to assess the effectiveness of fertilizer application. The N dilution curve describes the decrease in plant N as biomass increases. This concept has not yet been tested for its applicability and robustness under different cutting regimes in grasslands. We conducted a principal components analysis on biomass yield and N concentration data to discern relationships among experimental, climatic, and management factors. Next, two N dilution curve parameters were calibrated for different cutting frequencies. We compared N uptake using four different methods utilizing calibrated N dilution curves, a reference curve, and different cutting regimes representing different physiological ages of the crops at cutting. Our results show that excluding cutting frequency information overestimates values of N uptake. Calibration of the N dilution curve according to cutting frequency improves N uptake estimates relative to observed values. Therefore, N uptake is better estimated using both the N dilution curve and the cutting regime information.
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DOI:
10.2111/rem-d-12-00072.1
发表时间:
2012-11
期刊:
--
影响因子:
--
作者:
B. Bestelmeyer;D. Briske
通讯作者:
B. Bestelmeyer;D. Briske
影响因子:
3.3
作者:
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通讯作者:
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DOI:
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发表时间:
1963
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
1999
期刊:
影响因子:
--
作者:
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通讯作者:
R. Steinwender
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
V. Pavlů;J. Schellberg;M. Hejcman
通讯作者:
M. Hejcman