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Subject: Agronomy × Author: Ramandeep Kaur × End date: 2020 ×
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    ThesisItemOpen Access
    Weed management in maize (Zea mays L.) using straw mulch and herbicides
    (Punjab Agricultural University, Ludhiana, 2018) Ramandeep Kaur; Charanjeet Kaur
    The field experiment entitled “Weed management in maize (Zea mays L.) using straw mulch and herbicides” was conducted at Students’ Research Farm, Department of Agronomy, PAU, Ludhiana and Research Farm, Regional Research Station Gurdaspur (PAU) during kharif 2017. The experiment was conducted in a factorial randomized block design with three replications. There were three mulch treatments as first factor (no mulch, paddy straw mulch at 6.25 t ha-1 and paddy straw mulch at 9.0 t ha-1) and six weed control treatments were taken as second factor viz. atrazine at 1.0 kg ha-1 pre-emergence, atrazine at 0.8 kg ha-1 preemergence, tembotrione at 0.110 kg ha-1 at 20 DAS, tembotrione at 0.088 kg ha-1 at 20 DAS, weed free and unweeded check. The major weed flora included Dactyloctenium aegyptium, Eragrostis tenella, Digitaria sanguinalis, Echinochloa colona, Cynodon dactylon as grasses, Trianthema portulacastrum as broadleaf weed and Cyperus rotundus as sedge. Among different mulch treatments, application of paddy straw mulch at 9.0 t ha-1 recorded significantly lower density and weed dry matter accumulation of grasses, sedges and broadleaf weeds as compared to paddy straw mulch at 6.25 t ha-1 and no mulch treatments. Highest yield attributing characters, grain yield, net returns and benefit cost ratio were recorded with application of paddy straw mulch at 9.0 t ha-1 which were significantly higher than application of paddy straw mulch at 6.25 t ha-1 and no mulch treatment. Also, application of paddy straw mulch at 6.25 t ha-1 produced significantly higher growth and yield attributes of maize as compared to no mulch treatment. Among the herbicide treatments, tembotrione at 0.088 kg ha-1 and tembotrione at 0.110 kg ha-1 were found very effective in controlling different weed species as compared to atrazine at 0.8 kg ha-1 and atrazine at 1.0 kg ha-1. Application of tembotrione at 0.088 or 0.110 kg ha-1 in combination with straw mulch at 9.0 t ha-1 recorded significantly lower density and dry matter accumulation of all weed species but resulted in significantly higher yield attributing characters, grain yield, net returns and benefit cost ratio as compared to all other combinations of straw mulch and herbicides. Thus, for getting higher productivity and profitability from maize, tembotrione at 0.088 kg ha-1 as post-emergence in combination with paddy straw mulch at 9.0 t ha-1 can be applied, as this herbicide-mulch combination helps in reduction of 20% dose of herbicide.