Fertilizer nitrogen recovery as affected by soil organic matter status in two sites in Kenya

2007 ◽  
pp. 537-546 ◽  
Author(s):  
M.W. Karunditu ◽  
D.N. Mugendi ◽  
J. Kung’u ◽  
B. Vanlauwe
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Nitrogen Recovery ◽  
Fertilizer Nitrogen

Leys and soil organic matter: II. The accumulation of nitrogen in soils under different leys

1967 ◽  
Vol 69 (1) ◽  
pp. 133-138 ◽  
Author(s):  
C. R. Clement ◽  
T. E. Williams
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Soil Nitrogen ◽  
White Clover ◽  
Nitrogen Fertilizer ◽  
Annual Increment ◽  
Fertilizer Nitrogen ◽  
Grass Sward ◽  
Clover Content

1. The nitrogen content of an arable soil to 15 cm depth, sown to a ryegrass/white clover sward increased on average by 0·005 % N each year.2. Under a grass sward without clover and without fertilizer nitrogen, there was an increase of 0·017 % N in 3 yeais in the top 7·5 cm of soil; an annual addition of about 70 kg N/ha.3. Including white clover in grass swards not receiving nitrogen fertilizer resulted in an increase over 3 years of 0·026% N to 7·5 cm depth in one experiment, and 0·014% N to 15 cm depth in another, an annual increment of 100–110 kg N/ha.4. The increase was greater under ryegrass/white clover swards than under cocksfoot/white clover swards. A similar difference was found both in accumulation of organic carbon and in clover content. In an experiment comparing many different grasses it was not possible to distinguish differences in the level of soil nitrogen, after 4 years under grass, which could be ascribed to species or strains.There was no significant effect of nitrogen fertilizer applied at rates of up to 314 kg N/ha per year for 3 consecutive years.

scholarly journals NITROGEN RELATIONS IN A SWEET CORN/WHITE CLOVER LIVING MULCH CROPPING SYSTEM

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1157g-1157
Author(s):  
Lee S. Altier ◽  
H. Christian Wien
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
White Clover ◽  
Sweet Corn ◽  
Cropping System ◽  
Soil Sampling ◽  
Fertilizer Nitrogen ◽  
Nitrogen Exchange ◽  
Clover Content ◽  
Nitrogen Relations

In a two-year field experiment, sweet corn was intercropped with a perennial cover of white clover. The clover was suppressed after corn emergence by rototilling. The nitrogen exchange between the corn, clover, and soil was closely monitored. Soil sampling indicated the rate and amounts of mineralization of nitrogen from soil organic matter and clover. Fertilizer labelled with 15-N was used to assess contributions of nitrogen from the various sources.Results from 1989 showed little nitrogen benefit to the corn from the clover. Content of 15-N in the corn indicated that non-fertilizer nitrogen uptake was similar in monocropped and intercropped corn treatments. Corn yields were correlated with the amount of nitrogen fertilizer applied.

scholarly journals NITROGEN RELATIONS IN A SWEET CORN/WHITE CLOVER LIVING MULCH CROPPING SYSTEM

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1157G-1157
Author(s):  
Lee S. Altier ◽  
H. Christian Wien
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
White Clover ◽  
Sweet Corn ◽  
Cropping System ◽  
Soil Sampling ◽  
Fertilizer Nitrogen ◽  
Nitrogen Exchange ◽  
Clover Content ◽  
Nitrogen Relations

In a two-year field experiment, sweet corn was intercropped with a perennial cover of white clover. The clover was suppressed after corn emergence by rototilling. The nitrogen exchange between the corn, clover, and soil was closely monitored. Soil sampling indicated the rate and amounts of mineralization of nitrogen from soil organic matter and clover. Fertilizer labelled with 15-N was used to assess contributions of nitrogen from the various sources. Results from 1989 showed little nitrogen benefit to the corn from the clover. Content of 15-N in the corn indicated that non-fertilizer nitrogen uptake was similar in monocropped and intercropped corn treatments. Corn yields were correlated with the amount of nitrogen fertilizer applied.

Soil Organic Matter

1962 ◽  
Vol 54 (5) ◽  
pp. 470-470
Author(s):  
T. M. McCalla
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter
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