Entrapped pre-emergence oxadiargyl on growth and yield of rice under various agro-ecosystems

Bommayasamy, N.; Chinnamuthu, C. R.

doi:10.5958/0974-8164.2018.00068.0

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“…It might be due to zeolite and biochar entrapped herbicides have increased sorption and decreased the dissipation of herbicide in soil which helps to release herbicide slowly through entire season which destroy food reserve of weed seeds and caused lesser regeneration of weeds. Similarly, Govindan and Chinnusamy (2014); Kailkhura et al (2015); Bommayasamy and Chinnamuthu (2018b) reported that slow release of herbicide formulations reduced leaching loss of active ingredients, which affects late emerging of weeds and biomass accumulation of weeds. Microencapsulation of metazachlor with terpolymer (PLAGA-PEG-PLAGA) protected degradation rate of microparticle which led to the prolong release of herbicides and reduced excess leaching into soil (Rychter et al, 2019;Lewicka et al, 2020).…”

Section: Introductionmentioning

confidence: 98%

Effect of encapsulated herbicides on weed control, productivity and nutrient uptake of rice (Oryza sativa)

Bommayasamy¹,

Chinnamuthu²

2021

JEB

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Aim: To study the effect of season-long weed management using encapsulated herbicides on weed control, productivity and nutrient uptake of rice. Methodology: Field experiment was carried out with oxadiargyl encapsulated / loaded in zeolite, biochar, starch, water soluble polymer. It was compared with commercial formulation of oxadiargyl, butachlor, weed free check and weedy check. The experiments were laid out in randomized complete block design and replicated thrice. The physico-chemical properties of the experimental sites was sandy clay loam to clay loam in texture with pH ranging from 6.9 to 7.3, low organic carbon content, low available nitrogen, medium available phosphorus and potassium. Results: The lowest weed density and weed dry matter production of 47.3, 28.0 m-2 and 96.2, 32.8 kg ha-1 was observed in 2016 and 2017 respectively with the application of oxadiargyl loaded with zeolite at 20 DAT. Application of butachlor at 1.25 kg ha-1 fb hand weeding on 40 DAT and application of oxadiargyl loaded with zeolite recorded 86.7, 76.9 and 81.3, 72.8 percent higher grain yield in 2016 and 2017, respectively, as compared to weedy check. Higher N, P, K uptake was observed with application of butachlor at 1.25 kg ha-1 fb hand weeding on 40 DAT, which was comparable with oxadiargyl loaded with zeolite and oxadiargyl loaded with biochar during both the year. Interpretation: It can be concluded that oxadiargyl loaded with zeolite was more efficient in controlling weeds coupled with maximum growth and productivity under the constrained situation of manual weeding. Key words: Biochar, Encapsulation, Herbicides, Rice, Water soluble polymer, Zeolite

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Section: Introductionmentioning

confidence: 98%