Effect of fertility levels and weed management practices on weed dynamics, growth, yield and quality of linseed (Linum usitatissimum L.) and their residual effect on fodder pearl millet (Pennisetum glaucum L.)
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Date
2022
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Abstract
Present field experiment was conducted at experimental farm, Rajasthan
Agricultural Research Institute, Durgapura – Jaipur for two consecutive years
during Rabi season of 2016-17 and 2017-18 to evaluate the effect of treatments
on weed dynamics, growth, yield, quality and economics of the crop followed with
Summer 2017 and 2018 for assessing residual effect of fertility levels and weed
management practices on succeeding fodder pearl millet on loamy sand soil.
There were 28 treatment combinations consisting of 04 fertility levels (75 % RDF,
100 % RDF, 125 % RDF and 150 % RDF) and 07 weed management practices
(Weedy check, hand weeding, Pendimethalin 30 EC, Pendimethalin 38.7 CS,
Clodinafop propargyl 15 WP and Imazethapyr 10 % SL and Weed free) were
tested in factorial randomized block design with three replications.
Results indicated that 150 % RDF dose proved significantly superior to
other fertility levels with respect to plant height, number of branches per plant,
per plant dry matter accumulation (g) and leaf area (cm2
). The yield attributes viz.
number of capsules plant-1
and weight of capsules plant-1
(g) and seed, stover
and biological yields were significantly higher in 150 % fertility level. The uptake
of NPK was also significantly higher with the application of 150 % RDF dose. Oil
and protein yield were also recorded significantly higher under 150 % RDF.
Results showed that weed density of most of broad leaved weeds were
most effectively controlled by pre-emergence application of Pendimethalin 38.7 CS followed by Pendimethalin 30 EC, Imazethapyr 10 % SL and Clodinafop
propargyl 15 WP. Similarly grassy weeds were most effectively controlled by
Pendimethalin 38.7 CS followed by Pendimethalin 30 EC, Clodinafop propargyl
15 WP and Imazethapyr 10 % SL. Maximum seed and stover yields were
obtained under weed free and hand weeding at 20-25 DAS followed with
Pendimethalin 38.7 CS. However, maximum net returns and B:C ratio (Rs. 43153
ha-1
and 2.31) were obtained under application of Pendimethalin 38.7 CS.
Amongst the combined use of studied production factors, application of
150 % RDF along with weed free proved optimum for realizing higher productivity
(1509 kg ha-1
). Further, the application of 150 % RDF along with Pendimethalin
38.7 CS proved optimum for realizing higher net returns (Rs. 50023 ha-1 with B:C
ratio of 2.50).
The result of present investigation suggested that the application of 150
% RDF and Pendimethalin 38.7 CS or hand weeding proved as sustainable
approach to augment the productivity and profitability of crop. There was no
significant residual effect of fertility levels and weed management practices on
succeeding summer fodder pearl millet