Long-term effects of organic manures and fertilizers in pearl millet-wheat cropping sequence
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Date
2006
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Publisher
CCSHAU
Abstract
A long-term field demonstration entitled, “Long-term effects of organic manures
and fertilizers in pearl millet-wheat cropping sequence” going on the Research Area of
the Department of Soil Science, CCS Haryana Agricultural University, Hisar (Haryana),
Since 1995 was selected for the present study. Soil and plant sampling was done
during 2005 after 10th cycle of pearl millet-wheat cropping sequence.
Lowest yield of pearl millet and wheat was obtained when only organic
manures were applied. A significant increase in yield was obtained with the combined
application of organic manures with N or NP fertilizers. Higher uptake of N, P and K by
pearl millet and wheat was recorded with the application of organic manures in
conjunction with NP fertilizers over no manure was applied.
Application of organic manures did not have much effect on soil pH. Lowest pH
was obtained with the application of FYM15N150. The EC of soil increased with the
application of organic manures alone or in combination with NP fertilizers. EC of the
surface soil was higher as compare to sub-surface soil. Organic carbon content of the
soil decreased from its original value, when only NP fertilizers were applied and
increased significantly with the application of organic manures (FYM, poultry manure,
pressmud) applied alone or with NP fertilizers. The highest organic carbon content of
the soil has approached to 0.99 percent in plot receiving FYM15N150P30 ha-1. The
organic carbon content was higher in surface soil as compare to sub-surface soil.
The application of organic manures and NP fertilizers could not sustain the
original level of N. Among the different treatments application of pressmud7.5N150P30
recorded highest build up of available N (90.2 mg kg-1) in soil. The build up of available
N was higher in surface soil as compare to sub-surface soil. The application of organic
manures with fertilizers increased the available P and K content of soil. The available
P content of soil increased from its original value 12.6 mg kg-1 to 26.80 mg kg-1 with
the application of poultry manure5. Available K content of soil also increased with the
application of organic manures. The highest available K content was found in plot
receiving FYM15plus N150P30. Available P and K were higher in surface soil than subsurface
soil.
The DTPA extractable micronutrients (Zn, Fe, Mn and Cu) content of soil
increased with the application of organic manures (FYM, poultry manure, pressmud).
The DTPA extractable micronutrients were higher with the application of FYM as
compare to poultry manure and pressmud. In sub-surface soil same trend was
followed but rate of increase was less than the surface soil. These results indicate that
the use of organic manures in conjunction with chemical fertilizer is very important for
ensuring better crop productivity for sustainable basis, so that the soil health can be
maintained.