| 000 -LEADER |
|---|
| fixed length control field |
021760000a22003250004500 |
| 082 04 - DEWEY DECIMAL CLASSIFICATION NUMBER |
|---|
| Classification number |
40025 |
| 040 ## - CATALOGING SOURCE |
|---|
| Original cataloging agency |
CR-TuBCO |
| Transcribing agency |
CR-TuBCO |
| Language of cataloging |
Es |
| 003 - CONTROL NUMBER IDENTIFIER |
|---|
| control field |
CR-TuBCO |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
92142 |
| Personal name |
MAZZARINO, M. |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
66131 |
| Personal name |
EWEL, J. |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
48342 |
| Personal name |
BERISH, C. |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
51399 |
| Personal name |
BROWN, B. |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
|---|
| Date of publication, distribution, etc |
1988 |
| 245 10 - TITLE STATEMENT |
|---|
| Title |
Efectos de una sucesión de cultivos en la fertilidad de suelos volcánicos respecto a la sucesión natural |
| 500 ## - GENERAL NOTE |
|---|
| General note |
16ref. Sum.(En,Es) |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc |
The effects of two treatments - natural succession and successional monoculture - on volcanic soil fertility following forest felling and vurning were studied over 5 yr in Costa Rica. For the successional monoculture maize (Zea mays), cassava (Manihot esculenta) and laurel(Cordia alliodora) were chosen. Owing to microvariability problems, each treatment was divided intro two groups of different fertility. Data on above-ground biomass and soil organic matter, total N, available P. percent acid saturation, extractable Ca, Mg, K and Al + H were analysed statistically. Percent acid saturation was considered a suitable index to evaluate tropical volcanic soil fertility (high saturation + high fertility) and vice versa. Defined in these terms, soil fertility was little affected by successional monoculture or natural succession when the original conditions of acid saturation were low (<2 percent at depth 0-5 cm. <20 percent at depth 5-25 cm). However, soil fertility was significantly affected when the original conditions were of high acid saturation (>7 percent at depth 0-5 cm. >50 percent at depth 5-25 cm); soil fertility was reduced under both successional monoculture and natural succession, but the reduction was less under the latter. A non-statistical comparison with a bare plot is also included |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| 9 (RLIN) |
164829 |
| Topical term or geographic name as entry element |
SISTEMAS DE CULTIVO |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| 9 (RLIN) |
2064 |
| Topical term or geographic name as entry element |
COSTA RICA |
| 691 ## - LOCAL SUBJECT ADDED ENTRY--GEOGRAPHIC NAME (RLIN) |
|---|
| 9 (RLIN) |
142769 |
| Geographic name |
CROPPING SYSTEMS |
| 691 ## - LOCAL SUBJECT ADDED ENTRY--GEOGRAPHIC NAME (RLIN) |
|---|
| Geographic name |
COSTA RICA |
| 9 (RLIN) |
2064 |
| 692 ## - |
|---|
| -- |
SYSTEME DE CULTURE |
| 692 ## - |
|---|
| -- |
COSTA RICA |
| 773 0# - HOST ITEM ENTRY |
|---|
| Title |
Turrialba (Costa Rica) |
| Place, publisher, and date of publication |
1988 |
| Relationship information |
v.38(4)p.345-351 |
| 904 ## - LOCAL DATA ELEMENT D, LDD (RLIN) |
|---|
| a |
BCO |
| 905 ## - LOCAL DATA ELEMENT E, LDE (RLIN) |
|---|
| a |
C |
| 908 ## - PUT COMMAND PARAMETER (RLIN) |
|---|
| Put command parameter |
J |
| 909 ## - |
|---|
| -- |
AS |
| 914 ## - |
|---|
| -- |
FORES |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Analítica |
