Problematic weed management in sugarcane (Saccharum officinarum L.) ratoon
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Date
2021-11
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment entitled “Problematic weed management in sugarcane (Saccharum officinarum L.) ratoon” was conducted at Norman E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) during 2019-20 to study the effect of weed management treatments on weed density, weed dry matter and weed control efficiency, crop growth, yield attributes, quality of juice and economics of production. Sugarcane ratooning was done on 30/3/2020 after harvest of planted sugarcane on 24/3/2020. Experiment was laid out in Randomised Block Design with 9 treatments in 3 replications. Treatments consisted of T1- Trash mulch(8 tons/ha) at 3 DAR, T2- Atrazine 2000g/ha (PE) fb Trash mulch(8 tons/ha),T3-Atrazine 2000g/ha (PE) fb Topramezone 25g/ha (PoE), T4-Sulfentrazone 720g/ha (PE) fb 2,4-D EE 1000g/ha (PoE), T5-Sulfentrazone 720g/ha (PE) fb Metsulfuron methyl 4g/ha (PoE), T6 -Atrazine 2000g/ha + Halosulfuron 67.5g/ha (PoE) (TM), T7-Metribuzin 1000g/ha + Halosulfuron 67.5g/ha (PoE) (TM), T8-Three hoeing at 30, 60 and 90 DAR, T9-Unweeded control. The soil of the experimental field was silty clay loam in texture, high in organic carbon, low in available nitrogen and medium in available phosphorus and potassium. The findings of the experiment indicated that sequential application of Sulfentrazone 720g/ha (PE) fb 2, 4-D EE 1000g/ha (PoE) resulted in lowest weed density, lowest dry matter accumulation and highest weed control efficiency was recorded with Atrazine 2000g/ha (PE) fb Topramezone 25g/ha (PoE). The sequential application of Atrazine 2000g/ha (PE) fb Topramezone 25g/ha (PoE) exhibited highest cane and sugar yield of 71.4 and 7.2 t/ha respectively being at par with T8 followed by T7. The higher yield in these treatments was due to higher NMC and higher individual cane weight. The higher NMC was due to higher shoot population which in turn was the result of higher initial emergence and less shoot mortality at harvest and higher cane weight was due to higher cane girth and length. However, there was no effect of weed management treatments on juice quality parameters i.e. brix, sucrose %, purity coefficient, available sugar and reducing sugars as these parameters are governed by the crop genotype.