Deepa S
Integrated Nutrient Management In A Rice-Rice Cropping System - Vellayani Department of Agronomy, College of Agriculture 1998
An experiment entitled "Integrated nutrient management in a rice-
rice cropping system" was condcuted at Cropping Systems Research
Centre, Karamana during the second crop season of 1995-96, to study the
effect of long term application of manures and fertilizers on the availability
and uptake of nutrients and changes in the physico-chemical properties of
the soil for sustained productivity.
The experiment was laid out in randomized block design with
twelve sets of treatments and four replications. The twelve sets of
treatments incldued four treatments of different levels of recommended
fertilizers, treatments of integration of chemical fertilizers with organic
sources like farm yard manure, crop residues (rice straw) and green
manure, along with one each of unfertilized control and farmers practice
of manuring.
Organic manure addition in different forms was found to have
pronounced effect on various growth and yield attributing characters of
rice when applied in combination with chemical fertilizers. When compared
to other treatments, application of 25 or 50 per cent of recommended N
through farm yard manure in kharif followed by 75 or 100 per cent of
recommended NPK through chemical fertilizers in rabi, gave higher tiller
number, root production, productive tiller number, thousand grain weight,
grain yield, and straw yield.
Integration of organic manures with inorganic fertilizers improved
the N, P and K uptake by the plant at all growth stages and at
harvest. Highest Nand K uptake were recorded when 50 per cent N,
supplied through farm yard manure in kharif season. Highest P uptake
was recorded when 25 per cent of N supplied through crop residue in
kharif.
In general the available N,P,K and organic carbon contents of the
soil were slightly improved due to combined application of organic and
inorganic sources of fertilizers. Application of farm yard manure to meet
50 per cent of N along with 100 per cent recommended dose of fertilizers
recorded maximum available NPK and organic carbon
Bulk density was lowest under treatment receiving 50 per cent
recommended N through farm yard manure in kharif. Incorporation of
paddy straw, to meet 25 per cent N along with chemical fertilizers enhanced
water holding capacity and cation exchange capacity of the soil.
630 / DEE/IN
Integrated Nutrient Management In A Rice-Rice Cropping System - Vellayani Department of Agronomy, College of Agriculture 1998
An experiment entitled "Integrated nutrient management in a rice-
rice cropping system" was condcuted at Cropping Systems Research
Centre, Karamana during the second crop season of 1995-96, to study the
effect of long term application of manures and fertilizers on the availability
and uptake of nutrients and changes in the physico-chemical properties of
the soil for sustained productivity.
The experiment was laid out in randomized block design with
twelve sets of treatments and four replications. The twelve sets of
treatments incldued four treatments of different levels of recommended
fertilizers, treatments of integration of chemical fertilizers with organic
sources like farm yard manure, crop residues (rice straw) and green
manure, along with one each of unfertilized control and farmers practice
of manuring.
Organic manure addition in different forms was found to have
pronounced effect on various growth and yield attributing characters of
rice when applied in combination with chemical fertilizers. When compared
to other treatments, application of 25 or 50 per cent of recommended N
through farm yard manure in kharif followed by 75 or 100 per cent of
recommended NPK through chemical fertilizers in rabi, gave higher tiller
number, root production, productive tiller number, thousand grain weight,
grain yield, and straw yield.
Integration of organic manures with inorganic fertilizers improved
the N, P and K uptake by the plant at all growth stages and at
harvest. Highest Nand K uptake were recorded when 50 per cent N,
supplied through farm yard manure in kharif season. Highest P uptake
was recorded when 25 per cent of N supplied through crop residue in
kharif.
In general the available N,P,K and organic carbon contents of the
soil were slightly improved due to combined application of organic and
inorganic sources of fertilizers. Application of farm yard manure to meet
50 per cent of N along with 100 per cent recommended dose of fertilizers
recorded maximum available NPK and organic carbon
Bulk density was lowest under treatment receiving 50 per cent
recommended N through farm yard manure in kharif. Incorporation of
paddy straw, to meet 25 per cent N along with chemical fertilizers enhanced
water holding capacity and cation exchange capacity of the soil.
630 / DEE/IN