Chief EditorT. Mohapatra
Print ISSN 0367-8245
Online ISSN 0976-058X
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Effect of Integrated Weed Management on Weed and Yield of Direct Seeded Rice
First Online 04-08-2021|
Methods: The experiment was laid out in randomized block design with three replications and twelve treatments during 2017 at G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India. The twelve treatments included the combination of cultural, mechanical, physical and chemical weed management methods.
Result: Combination of stale seedbed technique integrated with pre-emergence application of pendimethalin with mechanical weeding at 25 DAS followed by 1 hand weeding at 45 DAS, Sesbania (line sowing) fb application of pendimethalin (PE) fb 1 mechanical weeding at 25 DAS fb 1 hand weeding at 45 DAS, stale seedbed with application of pendimethalin (PE) with Sesbania brown manuring supplemented with mechanical weeding (25 DAS) fb hand weeding at 45 DAS, mulching with wheat straw mulch along with post-emergence application of penoxsulam (20 DAS) fb 1 hand weeding at 45 DAS and application of pendimethalin (PE) fb penoxsulum (PoE) at 20 DAS fb 1 hand weeding at 45 DAS with a row spacing of 25 cm found to be similar in the suppression of weed population and weed density at 40 and 60 DAS and crop yields (4.3, 4.1, 4.2, 4.0 and 4.2 t/ha, respectively) were on par with weed free plot i.e. 4.4t/ha. Application of pendimethalin (PE) fb penoxsulum (PoE) at 20 DAS fb 1 hand weeding at 45 DAS with row spacing of 25cm recorded 93.7%, 90.6% and 4.5% weed control efficiency, weed control index and weed index respectively, which was similar with above integrated weed management treatments. A negative correlation of the weed density and dry matter with the yield of rice was recorded.
MATERIALS AND METHOD
All 12 weed management treatments evaluated in the present study were viz. stale seedbed fb shallow tillage after 12 days fb PoE application of penoxsulum @ 22.5 g a.i./ha at 20 DAS (SSB fb PoE), Stale seedbed fb shallow tillage after 12 days PE application of pendimethalin @ 1 kg a.i./ha after sowing fb 1 hand weeding at 30 DAS (SSB fb PE fb 1 HW at 30 DAS), stale seedbed fb shallow tillage after 12 days fb PE application of pendimethalin @ 1 kg a.i. /ha after sowing fb 1 mechanical weeding at 25 DAS fb 1 hand weeding at 45 DAS (SSB fb PE fb 1MW fb 1HW), mulching fb PoE application of penoxsulum @ 22.5 g a.i. /ha at 20 DAS fb 1 hand weeding at 45 DAS (Mulch fb PoE fb 1HW), PoE application of penoxsulum @ 22.5 g a.i. /ha at 20 DAS fb 1 hand weeding at 45 DAS (PoE fb 1HW), Sesbania (line sowing) fb PE application of pendimethalin @ 1 kg a.i./ ha fb 1 mechanical weeding at 25 DAS fb 1 hand weeding at 45 DAS (SLS + PE fb 1 MW fb 1HW), Sesbania broadcasting fb PoE application of 2,4-D ethyl ester fb 1 hand weeding at 45 DAS [SBS(BM) fb 1 HW], Stale seed bed fb shallow tillage after 12 days fb line sown Sesbania with PE application of pendimethalin @ 1 kg a.i. /ha fb PoE 2,4-D @ 500 g a.i./ha at 25 DAS fb 1 hand weeding at 45 DAS (SSB fb SLS(BM) fb PE fb1 HW), PE application of pendimethalin @ 1 kg ai/ha fb PoE application of penoxsulum @ 22.5 g a.i./ha at 20 DAS fb 1 hand weeding at 45 DAS (PE fb PoE fb 1 HW), with row spacing of 20 cm PE application of pendimethalin @ 1 kg ai /ha fb PoE application of penoxsulum @ 22.5 g a.i./ha at 20 DAS fb 1 hand weeding at 45 DAS (PE fb PoE fb 1 HW (20 cm), weedy check and weed free.
The seeds of Sesbania aculeata were sown @ 40 kg/ha in as per treatments. The crop was fertilized with 120:60:40 kg N, P2O5 and K2O/ha, respectively. Nitrogen was applied in 3 splits, the first 50% as basal dose and the rest two (25% each) at the time of active tillering and panicle initiation stage, respectively. The full quantity of phosphorous and potassium was applied as basal at the time of sowing.
The experiment was laid out in a randomized block design with three replications. All data were analyzed through analysis of variance (ANOVA) using standard variance techniques, as suggested by Gomez and Gomez (1984). Weed data were transformed to square root transformation (√x + 1) prior to statistical analysis for improving the homogeneity of variance. Treatment means were separated using the critical difference (CD) at 5% level of significance (P≤0.05).
Similarly, weed-control efficiency (WCE), weed control index (WCI) and weed index (WI) were calculated as per Mani et al., (1973) and Das (2008).
WDT and WDC, weed density (no./m2) in treated and weedy check plot respectively; WDMT and WDMC, weed dry weight (g/m2) in treated and weedy check plot respectively; YT and YWF, yield in treated and weed free plot respectively.
RESULTS AND DISCUSSION
The field trial was conscientiously monitored throughout crop growth stages and the presence of the following three types of weeds was found in the field i.e. Echinochloa cruss-galli, Echinochloa colona and Leptochloa chinensis among grassy weed; Cyperus iria and Cyperus difformis among sedges; Ammania baccifera and Alternanthera sessilis among broadleaf weeds. Similar composition of weed flora in direct-seeded rice was also reported by Singh et al., (2017) and Kashyap et al., (2019).
Weed density and weed dry matter
In our study, integrated weed management (IWM) practices had a remarkable influence on total weed density and weed dry weight at 40 and 60 DAS (Table 1). The highest and lowest weed density and dry weight at both stages were observed under weedy check and weed free conditions, respectively. However, among the integrated management of weeds, recommended practice i.e. PE fb PoE fb 1 HW at 20 cm row spacing resulted in the lowest weed density (no./m2) and dry weight (g/m2) during 40 DAS (10.7 and 8.8, respectively) and 60 DAS (7.1 and 12.3, respectively, which was on par with SSB fb PE of pendimethalin fb 1 HW at 30 DAS.
At 60 DAS, stale seedbed fb PE of pendimethalin fb 1MW fb 1HW at 45 DAS resulted in the lowest weed density among IWM practices and was similar to recommended practice under 25 cm spacing. While in both stages weed population and dry matter accumulation were statistically at par under remaining integrated weed management practices except in stale seedbed along with either alone post-emergence application of penoxsulam and SSB fb PE of pendimethalin fb 1 HW at 30 DAS. A similar result was also reported by Singh et al., 2007 in which mulching of previous wheat crop residue at 4 t/ha reduced annual and broadleaved weed densities in dry-DSR compared with no mulch and Sesbania co-culture in rice reduced broadleaf and grass weed density by 76-83% and 20-33% respectively, and total weed biomass by 37-80% compared to the sole rice crop. Also, the brown leaves of Sesbania after the herbicide application served the purpose of mulch as well as smothering effect on the weed flora of rice (Gopal et al., 2010). Also, stale seedbed with shallow tillage was found effective in controlling all early flush of weed seedlings above and below the soil surface (Singh et al., 2018).
Weed control efficiency, weed control index and weed index
Weed control efficiency and weed control index varied with different weed management practices at 60 DAS (Table 2). Maximum and minimum WCE and WCI recorded in weed free and weedy check plots respectively. Among the weed management pendimethalin fb penxosulam fb 1 HW at 45 DAS with row spacing 20 cm recorded highest WCE (96.8%) and WCI (93.9%), but, the weed index was 15.9% which pointed out the relative yield loss over weed free, as a result of competition caused by closer spacing. These results were agreed with the findings of Kokilam et al., (2020). Stale seedbed fb application of pendimethalin fb mechanical weeding and hand weeding at 45 DAS recorded similar WCE, WCI and WI (93.7, 90.2 and 2.9, respectively) as that of the recommended practice of weed management with row spacing 25 cm.
The data perusal on grain yield (Table 2) showed that weed free recorded the highest grain yield (4.4 t/ha) which was at par with the following treatments; recommended practice with 25 cm row spacing, SSB fb application of pendimethalin fb 1 mechanical weeding at 25 DAS fb 1 HW at 45 DAS (4.3 t/ha), mulching with the application of penoxsulam (PoE) at 22.5 g/ha fb 1 HW at 45 DAS (4.1 t/ha), line sown Sesbania + application of pendimethalin (PE) fb 1 MW fb 1 HW (4.0 t/ha) and SSB with line sown Sesbania fb application of pendimethalin fb application of 2,4-D (PoE) fb 1 HW at 45 DAS (4.0 t/ha). Grain: straw ratio and harvest index of rice were not significantly influenced by the integrated weed-control treatments. This might be because of efficient weed control due to the integration of cultural, mechanical and chemical methods along with hand weeding which finally influenced weed population their biomass accumulation and yield. The similar result were also suggested by Gaire et al., 2013 that Sesbania co-culture with rice helped in lowering the weed population by nearly about 50% with a supplementary effect on rice yield. Also addition of mechanical weeding by conoweeder to weed control option provided better weed control in inter rows as well as aeration to soil root zone ensuing superior crop yield (Kumar et al., 2012). A negative correlation of the weed density and dry matter with the yield of rice was obtained (Fig 1 and 2). It implies that the grain yield of direct-seeded rice decreased proportionally with the increase in interference of weed and vice-versa. Comparable result between weeds and crop was also reported by Ganai et al., (2014), that high weed density and biomass resulted in significant reductions in the crop yield.
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