Medium-term changes in the labile nutrient pool of
microbial biomass carbon (MBC) and nitrogen (MBN) resulting from organic manure
application in rice (Oryza sativa L.)-based
triple cropping systems have been poorly studied. Therefore, the effects of
organic materials on the soil physico-chemical properties and microbial biomass
in rice fields were investigated at Bangabandhu Sheikh Mujibur Rahman
Agricultural University, Bangladesh, from April 2010 to December 2012. Five
treatments (control, cow dung, poultry manure, rice straw, and chemical
fertilizer) were laid out in a randomized complete block design with four
replications. The organic residues (2 t C ha-1) were applied 7 days
before transplanting and were combined with inorganic fertilizers, following
integrated plant nutrition systems. This paper presents the results from the
last of the five consecutive rice growing seasons. All of the organic residues
increased the pH, and organic C, N, P, and K contents of the soil. However, poultry
manure was more efficient in increasing soil fertility than cow dung and rice
straw, resulting in a significant increase in P from 22 mg·kg-1 to
63 mg·kg-1 at crop harvest. All of the organic residues also
increased the soil water holding capacity and decreased bulk density.
Furthermore, poultry manure resulted in significantly higher microbial biomass
C (432 mg·kg-1; P < 0.05)
and N (31.60 mg·kg-1; P <
0.05) levels in the soil at crop harvest, followed by cow dung and rice straw.
These findings indicate that the regular application of organic residues and
manures will help to enhance soil fertility and production sustainability.
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