An evaluation of a microbial inoculum in promoting

Authors: Peng Su Philip C Brookes Yan He Jianjun Wu Jianming Xu

Publish Date: 2016/02/02

Volume: 16, Issue: 6, Pages: 1776-1786

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Abstract

Two incubation experiments were conducted for 105 days with a typical lowyield highclay soil in central China to monitor effects of straw and the inoculum on CO2 evolution as well as dissolved organic C DOC NH4 + NO3 − and pH under conditions of 15 °C 70  25 °C 40  25 °C 70  25 °C 100  and 35 °C 70  of waterholding capacity WHC with adequate N supplied as urea or manure respectivelyTreatments of 25 °C 70  WHC 25 °C 100  WHC and 35 °C 70  WHC generally achieved significant higher CO2 evolution while treatment of 25 °C 40  WHC had least This was more evident with added manure compared to urea P  005 The inoculum generally increased the decomposition of C inputs and the largest increases were in the initial 28 day in treatments 25 °C 70  WHC 25 °C 100  WHC and 35 °C 70  WHC only the 25 °C 40  WHC actually immobilized C The CO2 release rates were positively correlated with DOC but with different slopes within treatments Despite equivalent N application rates manure treatments had significantly less N including NO3 − NH4 + and total dissolved N than those with urea Incubation of 25 °C 40  WHC decreased soil pH the least probably due to relative low moisture causing delayed nitrificationThis work was jointly supported by the Special Fund for Agroscientific Research in the Public Interest Grant No 201003016 the National Key Basic Research Development 973 Project Grant No 2011CB100502 and the State Science and Technology Support Program Grant No 2012BAD15B04

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