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Synchrony between N release from (15...

Glasener, Karl McClellan.

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Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake./
作者:	Glasener, Karl McClellan.
面頁冊數:	71 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-03, Section: B, page: 0931.
Contained By:	Dissertation Abstracts International59-03B.
標題:	Agriculture, Soil Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9825991
ISBN:	0591782928

Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake.
Glasener, Karl McClellan.

Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake. - 71 p.

Source: Dissertation Abstracts International, Volume: 59-03, Section: B, page: 0931.

Thesis (Ph.D.)--North Carolina State University, 1998.

Replacement of the natural fallow with shorter managed fallows that employ leguminous cover crops to enhance and accelerate the regeneration of soil fertility, especially N, and control weeds, may provide an alternative to traditional shifting cultivation in the humid tropics. The present study involved an attempt to identify an efficient method for the

ISBN: 0591782928Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake.
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245 1 0 $a Synchrony between N release from (15)N-foliarly-labeled tropical legume mulches and plant N uptake.
300 $a 71 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-03, Section: B, page: 0931.
500 $a Chair: Michael G. Wagger.
502 $a Thesis (Ph.D.)--North Carolina State University, 1998.
520 $a Replacement of the natural fallow with shorter managed fallows that employ leguminous cover crops to enhance and accelerate the regeneration of soil fertility, especially N, and control weeds, may provide an alternative to traditional shifting cultivation in the humid tropics. The present study involved an attempt to identify an efficient method for the $\ rm\sp{15}N $ labeling of tropical legumes (Desmodium ovalifolium Guillemin and Perrottet and Pueraria phaseoloides (Roxb.) Benth.) for the purpose of quantifying the N contribution from the legumes (shoot vs. root N) to a corn (Zea mays L.)-rice (Oryza sativa L.)-corn rotation.
520 $a Nitrogen-15 recovery by Desmodium shoots was greater than Pueraria for all four application rates. Averaged over both species, maximum $\ rm \sp{15}N $ enrichments for leaves and stems of 0.7687 and 0.4013 atom % excess $\ rm \sp{15}N, $ respectively, were obtained from a single foliar application of urea containing 99 atom % $\ rm \sp{15}N. $ Maximum root $\ rm \sp{15}N $ enrichment of 0.1736 atom % excess $\ rm \sp{15}N $ was achieved via smaller, split-application doses. Averaged over both species and foliar application rates, total plant (shoots, flowers, leaf litter, and roots) recovery was approximately 79% and the soil 3% (2.5 and 0.5% were in the inorganic and organic fractions, respectively).
520 $a Averaged over the two species and summed over the corn-rice-corn rotation, crop recovery of the original $\ rm \sp{15}N $ applied in labeled legume residues equaled 22.4% (9.5% derived from labeled shoots and 12.9% from labeled roots). Forty-six percent of the original legume $\ rm \sp{15}N $ remained in the soil primarily as organic N, and 41% was unaccounted for. These percentages are considerably lower than those reported from N balance studies that do not employ $\ rm\sp{15}N $ methodology, indicating that the legume N contribution to a subsequent crop may have often been overestimated. Of the approximately 182 kg N $\ rm ha\sp{-1} $ removed in the grain of the corn-rice-corn rotation, averaged over species, a total of 18% (32 kg N $\ rm ha\sp{-1}) $ came from the initial 243 kg N $\ rm ha\sp{-1}) $ in cover crop root (14 kg N $\ rm ha\sp{-1}) $ and shoot (229 kg N $\ rm ha\sp{-1}) $ residues. The remaining 82% (150 kg N $\ rm ha\sp{-1}) $ came from the native soil N pool.
590 $a School code: 0155.
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0481
690 $a 0285
690 $a 0817
710 2 0 $a North Carolina State University. $3 1018772
773 0 $t Dissertation Abstracts International $g 59-03B.
790 1 0 $a Wagger, Michael G., $e advisor
790 $a 0155
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9825991