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Titolo:
EVALUATION OF SULFUR MINERALIZATION POTENTIAL OF MEADOW SOILS AND AVAILABILITY TO ALFALFA
Autore:
NDAYEGAMIYE A; SIMARD RR; DELISLE F;
Indirizzi:
MINIST AGR PECHERIES & ALIMENTAT QUEBEC,SERV SOLS,2700 EINSTEN ST FOYG1P 3W8 PQ CANADA MINIST ENVIRONM ST FOY G1V 4H2 PQ CANADA AGR CANADA,SOILS & CROPS RES CTR ST FOY G1V 2J3 PQ CANADA
Titolo Testata:
Canadian Journal of Soil Science
fascicolo: 3, volume: 74, anno: 1994,
pagine: 259 - 265
SICI:
0008-4271(1994)74:3<259:EOSMPO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE-SIZE FRACTIONS; NITROGEN-MINERALIZATION; ORGANIC-MATTER; CARBON; CULTIVATION; INCUBATION; TEMPERATURE; PHOSPHORUS; GRASSLAND; FOREST;
Keywords:
S-UPTAKE; ORGANIC-C; NITROGEN AND SULFUR; TEXTURE; INCREMENTAL ZERO-ORDER EQUATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
A. Ndayegamiye et al., "EVALUATION OF SULFUR MINERALIZATION POTENTIAL OF MEADOW SOILS AND AVAILABILITY TO ALFALFA", Canadian Journal of Soil Science, 74(3), 1994, pp. 259-265

Abstract

With the reduction in S inputs through atmospheric deposition and high analyses fertilizers, soil organic S will become a more important source of S to crops. Sulfur mineralization in 20 meadow soils was investigated using a long-term aerobic incubation and a greenhouse bioassaywith alfalfa (Medicago sativa L.). The cumulative S mineralization (S(m)) was linear with time for 13 soils whereas 7 soils showed an exponential phase over the first 10 wk followed by a linear release phase. Podzolic soils dominated the latter group. The data were described by an incremental zero-order model where an initial flush was accounted for. The total amount of mineralizable S (S(m)), the amount of S mineralized in the first 1.4 wk (S(e)), the S mineralization potential (S(o)) and the rate constant (k) were all very closely correlated to the N mineralization potential and to the amount of N mineralized in the first 1.4 wk of incubation (r = 0.64-0.85; P < 0.01). The S mineralization parameters were not significantly correlated to soil pH, total C, N,and S, C:S and N:S ratios and extractable P content. The S(e) and S(o) mineralization parameters were significantly correlated to the soil sand content (r = 0.51 and 0.53; P < 0.05) suggesting the possible involvement of particulate organic matter as a pool of mineralizable S. Alfalfa yield response to S addition was observed only on seven soils with lowest cumulative S. Total S uptake of alfalfa represented, on average, 10% of S(m) and was strongly correlated to S(m) (r = 0.81*) andk (r = 0.78*). The effect of S fertilizer on plant S uptake was observed only for the third cut (P < 0.01), this being probably due to mineralizable S depletion in soils. The results of this study suggest that the initial potential of N mineralization is a good indicator of S(m) and that a short term incubation could measure the S supplying powerof Quebec soils.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 15:28:04