Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir
| dc.contributor.advisor | Singh, Dr. Lal | |
| dc.contributor.author | Rehana Mohi-ud-din | |
| dc.date.accessioned | 2022-01-06T07:42:25Z | |
| dc.date.available | 2022-01-06T07:42:25Z | |
| dc.date.issued | 2019 | |
| dc.description | PhD Thesis submitted to SKUAST Kashmir | en_US |
| dc.description.abstract | The present study, ‘‘Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir’’ was carried out at Agronomy farm, FOA wadura campus of Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir during 2016 and 2017. Experiment was laid in Factorial RBD assigning four maize cultivars- Composite-3 (C-3), Composite-4 (C-4) Composite-5 (C-5) and Composite-6 (C-6) and five nitrogen levels- N0: 0 kg N ha-1, N60: 60 kg N ha-1, N90: 90 kg N ha-1, N120: 120 kg N ha-1 and N150: 150 kg N ha-1 and was replicated three times. The results revealed that Composite-4 (C-4) produced highest grain yield of 45.56 and 40.78 q ha-1, stover yield 73.98 and 70.47 q ha-1 and biological yield of 119.54 and 111.25 q ha-1 during 2016 and 2017, respectively. Growth characters like plant height (cm), LAI, dry matter production, functional leaves and yield attributes like number of cobs per plant, cob length with and without husk (cm), cob weight with and without husk (g), cob girth with and without husk (cm), grains per cob, harvest index and nitrogen uptake were recorded highest with composite-4 (C-4) maize cultivar. To complete growth phases more days were taken by composite-4 (C-4) which was at par with composite-3 (C-3) and lowest days were taken by composite-5 (C-5). Among nitrogen levels, 150 kg N ha-1 recorded highest grain yield of 45.17 and 41.91 q ha-1, stover yield 76.60 and 73.46 q ha-1 and biological yield 121.77 and 115.37 q ha-1 during 2016 and 2017, respectively. More number of days to complete different phenological stages was taken by higher N application treatment. Growth characters like plant height (cm), LAI, dry matter accumulation, functional leaves and yield attributes like number of cobs per plant, cob length with and without husk (cm), cob weight with and without husk (g), cob girth with and without husk (cm), grains per cob, harvest index and nitrogen uptake were recorded highest with application of 150 kg N ha-1 (N150) however, remained statistically at par with 120 kg N ha-1 (N120). Genetic coefficients of maize cultivars i.e. composite-3 (C-3), composite-4 (C-4), composite-5 (C-5) and composite-6 (C-6) were generated for calibration and validation of model CERES-Maize V 4.6 (DSSAT). Days to anthesis, maturity, LAI, grain yield, biological yield, nitrogen in grain and stover and total nitrogen uptake were used for validation. The DSSAT- CERES–Maize model performed well [as revealed by correlation coefficient (r), low root mean square error (RMSE) and low mean absolute percentage error (MAPE)] in simulating the days to anthesis (r = 0.30; RMSE = 2.41; MAPE = 2.92 %), maturity (r = 0.82; RMSE = 4.10; MAPE = 2.75 %), leaf area index (r =0.83; RMSE = 0.58; MAPE = 10.06 %), grain yield (r = 0.96; RMSE = 262.92; MAPE = 6.27 %), biological yield (r = 0.83; RMSE = 996.63; MAPE = 8.17 %), nitrogen in grain (r = 0.92; RMSE =5.05; MAPE = 7.74 %), nitrogen in stover (r = 0.77; RMSE =5.23; MAPE = 7.56 %) and total nitrogen uptake (r = 0.91; RMSE = 7.93; MAPE = 6.09 %). Simulation studies indicated that composite-4 (C-4) can be grown with higher yield. Highest response of fertilization (150 kg N ha-1) to all four maize cultivars has achieved, though highest yield was obtained from composite-4 (C-4) with 150 kg N ha-1 nitrogen application. Composite-5 (C-5) and without application of nitrogen recorded lowest simulated yield as observed at FOA, Wadura. The study finally concluded that the grain yield showed decreasing trend in composite-5 (C-5), while irrespective of maize cultivar, application of 120 kg N ha-1 to crop resulted in higher growth, yield attributes and yield of maize as compared to other nitrogen levels, further increase in N application beyond 120 to 150 kg N ha-1 showed non-significant increase as observed from field data at FoA, Wadura. However, model simulated yield was increased significantly upto 135 kg N ha-1 while beyond 135 kg N ha-1 showed non-significant effect on yield. It is concluded that DSSAT v 4.6 CERES-Maize model is very robust in predicting the growth and yield of maize as influenced by agrotechniques and could be used in wider perspective. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810180422 | |
| dc.keywords | CERES-Maize, cultivar, nitrogen, simulation, yield attributes, yield. | en_US |
| dc.language.iso | English | en_US |
| dc.publisher | SKUAST Kashmir | en_US |
| dc.research.problem | Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir | en_US |
| dc.sub | Agronomy | en_US |
| dc.subject | CERES-Maize, cultivar | en_US |
| dc.subject | nitrogen, simulation | en_US |
| dc.subject | yield attributes, yield. | en_US |
| dc.subject | Agronomy | en_US |
| dc.theme | Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir | en_US |
| dc.type | Thesis | en_US |