[Effects of applying inorganic P and wheat straw on the microbial biomass P and microbial P concentration in a calcareous soil with low concentration available P].
Ying Yong Sheng Tai Xue Bao
; 20(2): 325-30, 2009 Feb.
Article
de Zh
| MEDLINE
| ID: mdl-19459371
ABSTRACT
In an incubation test, a calcareous soil with low concentration of available P was amended with KH2PO4 (0, 25, 50, and 100 mg P x kg(-1)) and ground wheat straw (5 g C x kg(-1)), and incubated at 25 degrees C for 90 days. The aim was to investigate the change patterns of soil microbial biomass P and microbial P concentration as well as their relationships with soil available P. The results showed that both soil microbial biomass P and microbial P concentration increased with increasing inorganic P addition, with the maximum being 71.37 and 105.34 mg x kg(-1), respectively. The combined application of inorganic P (except 100 mg P x kg(-1)) and wheat straw decreased the soil microbial biomass P and microbial P concentration, being most obvious at early incubation period. Soil microbial biomass P and microbial P concentration had significant positive correlations (P < 0.05) with soil available P (R2 = 0.26 and 0.40, n = 49, respectively). The applied P could rapidly transform into microbial biomass P. The maximum apparent contribution rate of applied P to microbial biomass P was 71%. The added wheat straw could further improve the apparent contribution rate.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Phosphore
/
Sol
/
Microbiologie du sol
/
Triticum
/
Tiges de plante
Langue:
Zh
Journal:
Ying Yong Sheng Tai Xue Bao
Sujet du journal:
SAUDE AMBIENTAL
Année:
2009
Type de document:
Article
Pays d'affiliation:
Chine