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The effect of fertility management o...

Amos, Brigid.

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The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem./
作者:	Amos, Brigid.
面頁冊數:	137 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 1947.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3092525
ISBN:	0496402315

The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem.
Amos, Brigid.

The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem. - 137 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 1947.

Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2003.

An understanding of the effect of fertility management on soil surface fluxes of CO2, N2O, and CH4 is essential in evaluating carbon sequestration measures that increase soil organic carbon by increasing the amount of crop residue returned to the soil. While the data from this study suggest that the levels of NH4NO3 applied in an intensive fertility management regime (M2) caused a slight decrease in soil surface CO2 flux over the 27-month sampling period, soil surface CO2 flux in continuous maize under the M2 regime was not significantly different from that under recommended best management (M1). Annual estimates of soil surface CO2 flux based on an empirical equation were 11,600 kg C ha-1 yr-1 for the M2 treatment and 11,500 kg C ha-1 yr -1 for the M1 treatment in continuous irrigated maize.

ISBN: 0496402315Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem.
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245 1 4 $a The effect of fertility management on soil surface fluxes of greenhouse gases in an irrigated maize-based agroecosystem.
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500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 1947.
500 $a Supervisor: Timothy J. Arkebauer.
502 $a Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2003.
520 $a An understanding of the effect of fertility management on soil surface fluxes of CO2, N2O, and CH4 is essential in evaluating carbon sequestration measures that increase soil organic carbon by increasing the amount of crop residue returned to the soil. While the data from this study suggest that the levels of NH4NO3 applied in an intensive fertility management regime (M2) caused a slight decrease in soil surface CO2 flux over the 27-month sampling period, soil surface CO2 flux in continuous maize under the M2 regime was not significantly different from that under recommended best management (M1). Annual estimates of soil surface CO2 flux based on an empirical equation were 11,600 kg C ha-1 yr-1 for the M2 treatment and 11,500 kg C ha-1 yr -1 for the M1 treatment in continuous irrigated maize.
520 $a The amount of residue left by the previous crop had a significant effect on soil surface CO2 flux. Flux was generally higher in continuous maize plots than in maize plots that were part of a maize-soybean rotation. Root and rhizosphere respiration apparently exerted a consistent and highly significant influence on soil surface CO2 flux. Within row flux was, on average, 66% higher than between row flux. Three plant populations tested did not significantly affect measured soil surface CO2 flux.
520 $a Nitrous oxide flux was significantly higher in the high N M2 treatment during the 2000 growing season compared to both the M1 treatment and the unfertilized control areas. However, in 2001, no significant differences were observed, possibly due to changes in N application rate and timing as well as lower soil moisture. The M2 treatment significantly lowered soil pH during the 2001 growing season. Fertility management had no significant effect on CH 4 flux.
520 $a Electrical conductivity (EC) was significantly higher in the M2 treatment than in the M1 treatment and the control. Laboratory-measured EC was highly correlated with NO3--N concentration, and high field-measured EC values were associated with high N2O flux.
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