CROP STAND ESTABLISHMENT AND NUTRIENT MANAGEMENT IN RICE BASED CROPPING SYSTEM IN NORTH COASTAL ANDHRA PRADESH
Loading...
Date
2021-12-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Acharya N.G. Ranga Agricultural University, Guntur
Abstract
A field experiment entitled “Crop Stand Establishment and Nutrient
Management in Rice based Cropping system in North Coastal Andhra Pradesh” was
conducted for two consecutive years (2017 -18 and 2018-19) at the
Agricultural College Farm, Naira. The experimental site was uniform in
topography and the soil was a sandy loam in texture. The soil pH was slightly
acidic, low in organic carbon, low in available nitrogen, medium in available
phosphorus and medium in available potassium.
The experimentation was conducted during both kharif and rabi
seasons and during kharif experiment was laid out in split plot design with three
replications. The treatments consisted of two main plots (Wet seeded rice (Drum
seeding) and transplanting method) and four sub plots Viz., S1: 100% RDF
(Chemical fertilizers); S2: 75% RDF+ 25% RDF through FYM; S3: 75% RDF +
25% RDF through green manure crop (Sunhemp); S4: 50% RDF + 25% RDF
through FYM + 25% RDF through green manure crop (Sunhemp). During rabi
rice fallow crops viz., blackgram, ragi and sunhemp were sown each where in
kharif sub plot treatment which was sub divided into three sub-sub treatments
and thus, double split plot design was adopted for rabi and the total number of
plots during kharif was 24 (8×3=24) and during rabi was 72 (24×3=72)
respectively. The experiment on rice-rice fallow crops sequence was repeated in
another site during the 2nd
year.
Application of 75% RDF + 25% RDF through green manure crop (S3)
manifested significantly superior performance in terms of growth characters of
rice and other parameters studied, but remained on a par with the application of
100% RDF (S1) during both the years of study. The highest number of
xxiii
productive tillers m-2
(425 and 404), maximum number of filled grains panicle-1
(138 and 132) and test weight (24.22 and 22.53 g/1000 grains) were recorded
respectively during first and second year of study with S3 treatment applied with
75% RDF + 25% RDF through green manure crop but it was on par with S1
treatment receiving 100% RDF. The lowest number of yield attributes were
recorded with S4 50% RDF + 25% RDF through FYM + 25% RDF through
green manure crop in both the years of study.
Significantly higher grain (6166 and 5586 kg ha-1
) and straw yield (7157
and 7143 kg ha-1
) were recorded with the application of organic sources with
25% in S3 treatment and 75 % RDF + 25% RDF through green manure crop
which was at par with S1 where only (100% RDF) chemical source of fertilizers
were used. The lowest grain and straw yields were recorded when nutrient
applied with 50% RDF + 25% RDF through FYM + 25% RDF through green
manure crop during both the years of study.
All the nutrient contents (%) and uptake (kg ha-1
) i.e., nitrogen,
phosphorus, and potassium at different growth stages including grain and straw
have recorded the highest values with the treatment that received 75% RDF +
25% RDF through green manure which remained on par that was applied
100% RDF in both the years of study.
Post harvest available soil N, P and K status was significantly influenced
by nutrient management interventions. The N, P and K status in the soil was
recorded higher with 50% RDF + 25% RDF through FYM + 25% RDF
through green manure crop (S4) which was at par with 75% RDF + 25% RDF
through FYM (S2) and was found significantly superior to the rest of the
treatments.
During rabi significant increase in growth and yield attributes of rice
fallow crops (blackgram, ragi and sunhemp) was recorded with the treatment,
which received 50% RDF + 25% RDF through FYM + 25% RDF through
green manure crop (S4) which was however at par with 75% RDF+ 25% RDF
through FYM (S2) during both the years of study.
The residual effect of INM treatments iimposed in kharif rice on
succeeding rice fallow crops, resulted in higher net return and return rupee-1
investment with 50% RDF along with 25% RDF through FYM + 25% RDF
through green manure crop which was at par with 75% RDF + 25% RDF
through FYM during both the years of study.
Among the three rice fallow crops sunhemp recorded significantly
higher net return rupee
-1
investment (Rs. 63225 3.62) with 50% organic sources
(FYM and green manure) and (Rs. 59097 3.38) with 25% organic sources
(FYM) respectively. The second best crop in terms of net return and return
rupee
-1
investment was blackgram with Rs. 24401 and Rs. 23251 with return
rupee
-1
investment of 2.08 and 1.99, respectively. However, the crop ragi
recorded the lowest net return and return rupee
-1
investment.
Description
CROP STAND ESTABLISHMENT AND
NUTRIENT MANAGEMENT IN RICE
BASED CROPPING SYSTEM IN
NORTH COASTAL ANDHRA PRADESH