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Evaluation of a Crop Growth Model for Sweet Potato Over a Set of Agro-Climatic Conditions in India


Affiliations
1 ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
2 Rajendra Agricultural University, Pusa, Samasthipur 848 125, India
3 Bidhan Chandra Krishi Vishwavidyalaya (BCKV), Kalyani 741 252, India
4 Narendra Deva University of Agriculture and Technology, Faizabad 224 229, India
5 Maharana Pratap University of Agriculture and Technology, Udaipur 313 001, India
6 Shri Konda Laxman Telangana State Horticultural University, Rajendra Nagar 500 030, India
 

A study was conducted to evaluate the wider applicability of sweet potato growth model, ‘SPOTCOMS’ for simulating the phenology and yield over a set of agroclimatic conditions in India. The model simulated the phenology of the crop as a function of growing degree days. The genetic coefficients required for the model were estimated from the field experiments conducted with sweet potato variety, Sree Bhadra and other local varieties at the study locations. The model simulated the yield of the sweet potato well and the statistical indices calculated between the simulated and observed yields stated the reliability of the model simulations. The agreement index (D-index) for Sree Bhadra ranged from 0.55 to 0.99, and the D-index for local varieties ranged from 0.51 to 1.00. The calculated values of normalized objective function ranged from 0.01 to 0.10 for Sree Bhadra and 0.00 to 0.22 for other local varieties, and indicated better agreement of simulated and observed yields. The normalized ischolar_main mean square error ranged from 0.80% to 10.40% for Sree Bhadra and 0.00% to 22.44% for other varieties, and these results suggested the wider applicability of the model with excellent to good simulations. The model also simulated dry matter distribution in tubers pertaining to different stresses such as water, nitrogen and potassium. The study revealed that the simulation model ‘SPOTCOMS’ can be used for simulating the yield as well as to manage the stresses during the crop growth period and to optimize best management practices for the crop cultivation irrespective of the agroclimatic conditions.

Keywords

Crop Phenology, Calibration, Growing Degree Days, SPOTCOMS, Simulation.
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  • Evaluation of a Crop Growth Model for Sweet Potato Over a Set of Agro-Climatic Conditions in India

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Authors

V. S. Santhosh Mithra
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
Raji Pushpalatha
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
S. Sunitha
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
James George
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
P. P. Singh
Rajendra Agricultural University, Pusa, Samasthipur 848 125, India
R. S. Singh
Rajendra Agricultural University, Pusa, Samasthipur 848 125, India
J. Tarafdar
Bidhan Chandra Krishi Vishwavidyalaya (BCKV), Kalyani 741 252, India
Surajit Mitra
Bidhan Chandra Krishi Vishwavidyalaya (BCKV), Kalyani 741 252, India
Chandra Deo
Narendra Deva University of Agriculture and Technology, Faizabad 224 229, India
Sunil Pareek
Maharana Pratap University of Agriculture and Technology, Udaipur 313 001, India
B. K. M. Lakshmi
Shri Konda Laxman Telangana State Horticultural University, Rajendra Nagar 500 030, India
R. Shiny
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India
G. Byju
ICAR-Central Tuber Crops Research Institute, Thiruvananthapuram 695 017, India

Abstract


A study was conducted to evaluate the wider applicability of sweet potato growth model, ‘SPOTCOMS’ for simulating the phenology and yield over a set of agroclimatic conditions in India. The model simulated the phenology of the crop as a function of growing degree days. The genetic coefficients required for the model were estimated from the field experiments conducted with sweet potato variety, Sree Bhadra and other local varieties at the study locations. The model simulated the yield of the sweet potato well and the statistical indices calculated between the simulated and observed yields stated the reliability of the model simulations. The agreement index (D-index) for Sree Bhadra ranged from 0.55 to 0.99, and the D-index for local varieties ranged from 0.51 to 1.00. The calculated values of normalized objective function ranged from 0.01 to 0.10 for Sree Bhadra and 0.00 to 0.22 for other local varieties, and indicated better agreement of simulated and observed yields. The normalized ischolar_main mean square error ranged from 0.80% to 10.40% for Sree Bhadra and 0.00% to 22.44% for other varieties, and these results suggested the wider applicability of the model with excellent to good simulations. The model also simulated dry matter distribution in tubers pertaining to different stresses such as water, nitrogen and potassium. The study revealed that the simulation model ‘SPOTCOMS’ can be used for simulating the yield as well as to manage the stresses during the crop growth period and to optimize best management practices for the crop cultivation irrespective of the agroclimatic conditions.

Keywords


Crop Phenology, Calibration, Growing Degree Days, SPOTCOMS, Simulation.

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DOI: https://doi.org/10.18520/cs%2Fv117%2Fi1%2F110-113