NUTRIENT AND WEED MANAGEMENT IN BUCKWHEAT (Fagopyrum esculentum) AFTER SALI RICE
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Date
2019-12
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Abstract
An experiment entitled “Nutrient and weed management in buckwheat
(Fagopyrum esculentum) after sali rice” was conducted at Instructional-cum-Research
farm, Assam Agricultural University, Jorhat during the rabi season of 2018-19 to study
the effect of nutrient and weed management practices on buckwheat after sali rice
harvest. The experiment was laid out in factorial randomized block design with three
replications. The treatment consisted of four nutrient management practices viz., control,
application of 20-10-10 kg/ha N-P2O5-K2O, respectively, application of 20-10-10 kg/ha
N-P2O5-K2O, respectively + 1.25t/ha vermicompostand application of 20-10-10 kg/ha
N-P2O5-K2O, respectively + 2.5t/ha vermicompostand three weed management
treatments viz.,control,pre-emergence application of pendimethalin@ 0.75 kg/haand
pre-emergenceapplication of pendimethalin @ 0.75 kg/ha + dryland weeder at 40 DAS.
The soil of the experiment site was sandy loam in texture, acidic in reaction (pH: 5.6)
medium in organic C (0.58 %), available N (259.56 kg/ha),P2O5 (20.40 kg/ha) and
available K2O (161.23 kg/ha). The weeds of the experimental field wereEleusine indica,
Panicum repens, Paspalum compressus, Digitaria setigera, Cynodon dactylon among
the grasses; Cyperus rotundusamong the sedge; and Ageratum houstonianum,
Commelina benghalensis, Polygonum plebeium, Mimosa pudica and Acmella ciliata
among the broad leaved.
The density and dry weight of weeds in rainfed buckwheat were found to
be significantlylesserwith application of 20-10-10 kg/ha N-P2O5-K2O, respectively +
2.5t/ha vermicompostcompared to other treatments. As a result, the uptake of N, P and
K by weeds was found to be significantly lesser with N3. The growth parameters like
plant height, number of primary branches/plant and yield attributing characters viz.,
number of cyme/plant,number of seeds/cyme were found to be significantly higher in
N3. The highest seed yield (1249.99 kg/ha), stover yield (2046.76 kg/ha) wasthus
recorded with this treatment.
In respect of weed management,pre-emergence application of
pendimethalin@ 0.75 kg/ha + dryland weeder operation at 40 DAS was found to
significantly lower the density and dry weight, N,P and K content and uptake of weeds
in rainfed buckwheat.Thus, the growth and yield attributing characters of rainfed
buckwheatimproved with this treatment which recorded the highest seed(1080.55 kg/ha)
and stover(1824.02 kg/ha) yields.
The nutrient as well as weed management interacted significantly and the
combination of the two above-mentioned treatments was the best treatment combination
withthe seed yield of 1333.32 kg/ha and stover yield of 2079.16 kg/ha.This treatment
combination was also found to be the best with a gross return of Rs. 47,705.72, net
return of Rs. 26,032.58 and B: C ratio of 1.20.