SITE SPECIFIC NUTRIENT MANAGEMENT IN RICE-BLACKGRAM SEQUENCE
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Date
2021-12-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Acharya N.G. Ranga Agricultural University, Guntur
Abstract
A field experiment was conducted at the Agricultural College farm, Bapatla,
during kharif and rabi 2017-18 and 2018-19 to study the “Site specific nutrient
management in rice- blackgram sequence”. The experiment was conducted with variety
BPT-5204 in a Randomized Block Design with ten treatments and three replications.
The treatments comprised of, Recommended Dose of Fertilizer (T1), Soil test based
fertilizer recommendation(T2); Targeted yield fertilizer recommendations for 5.5 tons
ha-1
(T3) , 6.5 t ha-1 (T4) and 7.5 t ha-1
(T5) ; Treatment T1 + FYM @ 10 t ha-1
(T6);
Treatment T2 + FYM @ 10 t ha-1
(T7); Treatment T3 + FYM @ 10 t ha-1
(T8);
Treatment T4 + FYM @ 10 t ha-1
(T9); and Treatment T5 + FYM @ 10 t ha-1
(T10).
The experimental soil was clay loam in texture, slightly alkaline in reaction, non
saline, low in available nitrogen, low in organic carbon, high in available phosphorus
and potassium. The application of nutrients was done following the soil test based
fertilizer recommendations as per the treatment. Target yield fertilizer
recommendations were based on using the target yield equations developed for Krishna
Godavri agro ecological region.
Significantly higher plant height, drymatter accumulation and number of tillers m-2
were recorded with soil test based fertilizer recommendation with 10 t ha-1
FYM
application which was at par with soil test based fertilizer recommendation alone and
7.5 t ha-1
targeted yield recommendation along with FYM (T5 and T10), and RDF with
FYM (T6). Application of STFR+FYM application (T7) resulted in higher number of
panicles m
-2
and filled grains panicle-1
, which were comparable with that of soil test
based fertilizer recommendation alone (T2), 7.5 t ha-1 targeted yield fertilizer
recommendation with FYM (T10) and found significantly superior over other targeted
yield fertilizer recommendation treatments (T3, T4, T9 andT8).Grain yield of rice was significantly higher with soil test based fertilizer
recommendation with 10 t ha-1
FYM application which was statistically at par with soil
test based fertilizer recommendation alone (T2) and 7.5 t ha-1
targeted yield fertilizer
recommendation with FYM (T10) compared to the rest of the treatments. Straw yield of
rice recorded with STFR application with 10 t ha-1
FYM (T7) was significantly the
highest, but comparable with most of the treatments except treatments 5.5 t ha-1 target
yield recommendation (T3 ) and with FYM ( T8 ).
Uptake and content of N, P and K in grain and straw at harvest & soil N, P and
K status after rice were found significantly higher with the treatments that received soil
test based fertilizer recommendation with 10 t ha-1
FYM application, followed by soil
test based fertilizer recommendation (T2). Fertilizer use efficiency (FUE) was
significantly the highest with application of 5.5 t ha-1
target yield recommendation with
FYM (T8) compared to all other treatments. Application of soil test based fertilizer
recommendation (T2) recorded the highest returns per rupee investment and found
significantly superior to the rest of the treatments.
Residual effect of different integrated fertilizer applicationto rice revealed that
significant increase in plant height, drymatter accumulation, number of pods per plant
with soil test based fertilizer recommendation with 10 t ha-1
FYM application which
was on a par with soil test based fertilizer recommendation alone and superior to
fertilizer application through targeted yield fertilizer recommendations. Test weight
recorded with STFR fertilizer application with FYM (T7), STFR fertilizer application
alone (T2) and targeted yield (7.5 t) fertilizer recommendation with FYM (T10) were
significantly higher compared with remaining treatments.
Soil test fertilizer recommendation application with FYM (T7), imposed to rice
resulted in significantly higher seed yield and haulm yield of no till blackgram over
other treatments. The highest NPK uptake and content after harvest of blackgram was
observed with STFR fertilizer recommendation with 10 t ha-1
FYM followed by STFR
fertilizer recommendation alone and 7.5 t ha-1
target yield recommendation with FYM(T10)
and without FYM (T5).
The highest gross returns are recorded with the residual effect of treatment
STFR fertilizer application with FYM (T7) and found at par with that obtained from the
treatments T10 , T2 , T5. Maximum rice equivalent yield of blackgram as well as system
productivity of rice-blackgram sequence was observed with STFR application with
FYM (T7) which was closely followed by incorporation of STFR fertilizer application
alone (T2). Considering the overall system productivity of rice –blackgram sequence,
net returns and return per rupee invested were recorded with STFR fertilizer application
alone (T2) followed by 7.5 t ha-1
targeted yield fertilizer recommendation alone (T5).
Overall soil test based fertilizer recommendation with FYM followed by soil test
based fertilizer recommendation alone found superior in increasing growth, yield and
maximum returns in rice blakgram sequence; however, in consideration of overall system
productivity and economics, soil test based fertilizer recommendation alone proved
superior in rice -blackgram cropping sequence.
Description
SITE SPECIFIC NUTRIENT
MANAGEMENT IN
RICE-BLACKGRAM SEQUENCE