000			040160000a22005650004500
999			_c118863 _d118863
003			CR-TuBCO
005			20221110063751.0
007			ta
008			151019t 2005 xxu||||| |||| 00| 0 eng d
040			_aCR-TuBCO _cCR-TuBCO _bEspañol
041			_aeng
090			_aThesis _bP343
100	1		_9103832 _aPayan Zelaya, Fidel A.
110			_aCATIE - Centro Agronómico Tropical de Investigación y Enseñanza _cTurrialba, Costa Rica _eautor/a _93977
110	1		_920771 _aUniversity of Wales, Bangor (RU). School of Agricultural and Forest Sciences
245	1	0	_aEffects of Erythrina poeppigiana pruning residues on soil organic matter in organic coffee plantations _c
260			_aTurrialba (Costa Rica): _bCATIE, _c2005
270			_aSan José, C.R.
300			_a284 páginas _b: 20 figuras, 41 tablas
500			_a20 ilus. 32 tab. Bib. p. 271-285
502			_aTesis (Ph. D.) - CATIE-UWB, Turrialba (Costa Rica), 2005
504			_aIncluye referencias bibliográficas en las páginas 271-285
520			_aThe effects of Erythrina poeppigiana pruning residue effects on soil organic matter were investigated with three different objectives. Firstly, to study the effects of proximity of this shade tree on soil characteristics in organic and conventional coffee farms in Costa Rica, additionally a comparison between soil characteristics in organic and conventional farms was carried out (Chapter III). Secondly, to analyze the effects of Erythrina poeppigiana pruning residue additions on the size-density fractions, and on other fractions of soil organic matter (SOM) (Chapter IV), and thirdly, to investigate the effects on the application of microbial inocula or earthworm treatments on pruning residue decomposition, in order to evaluate the possibility of improving nutrient release from these pruning residues in the topsoil of organic coffee farms (Chapter V). A trend to higher total C and N concentrations for organic farms in comparison to conventional farms was found, but these differences were not significant in either of the two study years. No significant temporal changes in soil C or N concentrations were found between 2000 and 2004. In the 2004 study, significantly higher soil K and Ca concentrations were found near the shade tree due to the high contents of nutrients in E. poeppigiana pruning residues. All of the analyzed SOM fractions reflected SOM decomposition since they showed higher values when plant residue decomposition in the soil was incomplete (90 or 105 days). All the indicators also showed lower values or tended to have lower values at the end of each decomposition period (180 days). Total soil C was not a good indicator of short-term changes in labile SOM. No effects of microbial inocula or earthworm additions on soil K, NO3- or NH4+ concentrations were detected in the field trial. The microbial applications should be considered ineffective in increasing nutrient availability in field conditions and also in greenhouse conditions, due to weak temporary effects on maize seedling growth which were only observed in the first two weeks of the experiment on poor soils (taken from the 10-20 cm layer).
650	1	4	_9140993 _aCOFFEA ARABICA
650	1	4	_9146480 _aERYTHRINA POEPPIGIANA
650	1	4	_9134809 _aAGRICULTURA ORGANICA
650	1	0	_aAGRICULTURA TRADICIONAL _92167
650	1	4	_9134976 _aAGROFORESTERIA
650	1	4	_9158986 _aPLANTACION
650	1	4	_9143152 _aCULTIVOS DE INVERNADERO
650	1	4	_9159299 _aPODA
650	1	4	_9162727 _aRESIDUOS
650	1	4	_9154125 _aMATERIA ORGANICA DEL SUELO
650	1	4	_9143622 _aDEGRADACION
650	1	4	_9156490 _aOLIGOCHAETA
650	1	4	_9160850 _aPROPIEDADES FISICO-QUIMICAS SUELO
856	4	0	_uhttp://hdl.handle.net/11554/4928 _qpdf _yeng
901			_aF08
902			_aP33
903			_aZ
903			_aE
903			_aV
903			_aU
904			_aggolfin
905			_aT
906			_a20050923 _b20060125
908			_aB
942			_cDIG