Sugarcane growth and yield simulation using DSSAT-CANEGRO model
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled “Sugarcane growth and yield simulation using DSSAT-CANEGRO model” has been carried out at Punjab Agricultural University, Regional Research Station, Faridkot and Gurdaspur during 2017-18. The experiment was consisted with three planting dates (25th February, 25th March and 25th April) in main plots and four sugarcane cultivars (CoPb 91, CoJ 88, Co 118 and Co 238) in subplots of split plot design with three replications. To attain maturity, 25th February planted crop took 28-29 days and 56-60 days more duration than 25th March and 25th April planted crop, respectively. Delay in planting from 25th February to 25th March, decreased cane yield by 18.4% at Faridkot and 15.5% at Gurdaspur, yield reduction was more drastic 36.9 % and 31.2% with further delay in planting until 25th April, respectively. At both places, the higher cane yield in 25th February planted crop was mainly attributed by higher plant height, cane girth, dry matter accumulation, tillers population, cane weight, millable canes as well as juice extraction and sucrose per cent as compared to later crop. Among the cultivars, cane yield (117.19 and 131.03 t/ha) of CoPb 91 was 4.3 and 8.9 % higher than CoJ 88, 20.4 and 25.9 % than Co 118, 18.0 and 14.0 % than Co 238, respectively at Faridkot and Gurdaspur. Among various planting environments, Co 238 at Gurdaspur and CoJ 88 at Faridkot exhibited consistent cane yield contrary to Co 118, which exhibited unstable performance, at both locations. For planting between 25th February and 25th March, CoJ 88 at Faridkot and Co 118 at Gurdaspur were preferable but for planting between 25th March and 25th April, CoPb 91 was more suitable for cultivation, at both locations. Agroclimatic indices like GDD, HTU and PTU were considerably higher in early crop. Weather variables viz. maximum and minimum temperature, evaporation, rainfall, relative humidity morning and evening, GDD, HTU and PTU affected plant height, number of millable canes and cane yield. The DSSAT-CANEGRO model (v. 4.6) was calibrated and validated for each sugarcane cultivar having fair accuracy with index of agreement (d-Stat) by 0.88-0.94 for days taken to peak tiller population, 0.80-0.96 for days taken to physiological maturity, 0.94-0.98 for canopy height, 0.92-0.98 for leaf area index, 0.89-0.97 for sucrose dry mass, 0.86-0.94 for stalk dry mass, 0.94-0.98 for fresh cane yield and 0.81-0.94 for aerial dry bio mass.
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