Different organic fertilizers has affteted on the residual nutrients for rice growth and
yield in the next cropping. Effects of different organic fertilizers on residual nutrients, rice
growth and yield were studied. Results indicated that application of cow manure in the previous
crop resulted in significant difference in exchangeable potassium (K). Other essential nutrients
in soil after application of cow manure and compost residue were at high levels and sufficient
for rice growth except for nitrogen (N). Residual cow manure with and without split application
gave significantly highest rice tiller number and grain fresh and dry weight compared to the
other treatments. Nitrogen uptake in grain and K uptake in straw from the cow manure residue
was significantly different from the composted residue. Phosphorus (P) uptake in straw and
grain yield of all treatments was not significantly different, relating to high amounts of soil
available P. Total zinc (Zn) uptake from residual cow manure soil was also highest. Soil pH
after harvesting decreased slightly and total and available P in the control (no organic fertilizer
application) were lower than residual organic fertilizer treatments. Exchangeable K and
extractable sodium (Na) of residual cow manure were highest in soil after harvesting. Residual
cow manure gave high level of K which increased rice growth and yield but also increased
accumulation of non-essential elements such as sodium (Na). Results suggested that organic
fertilizers produced higher residual nutrients, except N, which were sufficient for rice growth
and yield in the next cropping. Residual cow manure gave higher exchangeable K which had a
positive effect on rice growth but increased Na accumulation in the soil.
Keywords
Sodium, Residual effect, Compost, Cow manure
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
Published by : Association of Agricultural Technology in Southeast Asia (AATSEA) Contributions welcome at : http://www.ijat-aatsea.com
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