Agriculture Reference
In-Depth Information
the effects of different biofertilizers on irrigated rice grain yield, (2) to in-
vestigate possible interactions of the effect of these biofertilizers with dif-
ferent inorganic fertilizer rates, and (3) to determine, based on the results,
whether biofertilizers are a possible option to improve the productivity of
rice production and under which conditions they give good results.
TABLE 1: Average top-soil characteristics (0-15 cm depth) for all experimental seasons
and both experimental sites.
Site
UPLB
IRRI
Soil type
Anthraquic Gleysols
Anthraquic Gleysols
2008/2009 DS
2009 WS
2010 WS
2010/2011 DS
pH (1:1)
-
6.9
6.8
6.9
6.5
Total organic C
g kg −1
18.6
15.9
16.2
15.0
Total soil N
g kg −1
2.7
1.6
1.5
1.5
Olsen P
mg kg −1
55
40
35
30
Avail K
cmol kg −1
-
-
1.26
1.32
Exch K
cmol kg −1
1.50
1.06
1.50
1.50
Exch Ca
cmol kg −1
-
-
18.9
18.1
Exch Mg
cmol kg −1
-
-
13.5
13.3
Exch Na
cmol kg −1
-
-
1.01
1.00
CEC
cmol kg −1
-
-
33.6
33.0
Clay
g kg −1
-
-
441
445
Silt
g kg −1
-
-
332
355
Sand
g kg −1
-
-
227
200
7.2 MATERIALS AND METHODS
7.2.1 SITE DESCRIPTION
The experiments were conducted during two dry seasons (DS) and two wet
seasons (WS). In the 2008/09 DS and the 2009 WS, an experimental site
at the Central Experimental Station of the University of the Philippines at
 
Search WWH ::




Custom Search