Modelling the impact of irrigation and fertigation scheduling on the tuber yield of drip-irrigated potato in Sahiwal District, Punjab, Pakistan | |
| Author | Abbas, Shakil |
| Call Number | AIT Thesis no.WM-18-31 |
| Subject(s) | Potatoes--Pakistan--Punjab--Sahiwal District Microirrigation--Pakistan--Punjab Sahiwal District Tuber crops--Yields--Pakistan--Punjab Sahiwal District |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Mast er of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis;no. WM-18-31 |
| Abstract | Water and nutrient are central factors in the growth and production of any crop, but at the same time their availability, efficiency and cost involved for their use are the real constraint faced today . The application of water and nutrient through conventional methods instigating loss to water and pollution to surface and ground water through runoff and leaching. It is very evident to optimize their use through new efficient irrigation application technology with well - prepared irrigation and nutrient schedules especially study area Punjab Pakistan where water scarcity is a huge threat to the future of agriculture. Potato production in Pakistan play a very important role in agriculture production and fulfilling the food requirement for increasing population. This study emphases on assessing the impact of irrigation and fertigation schedule on fresh tuber yield(t/ha) of potato using DSSAT - SUBSTOR - potato model. The model was calibrated and validated with experimental fresh tuber yield (t/ ha) data for cultivar S L 5 - 2 from 2014 - 2015 and 2016 - 2017 obtained from Potato Research Institute Sahiwal Punjab Pakistan. The model performed good with percentage error value of within ± 15 % , R 2 = 0.8 663 and RMSE= 2.28. The model was then fed with daily irrigation scheduling strategies IS 1 , IS 2 , IS 3 , IS 4 and IS 5 which represent daily irrigation schedule, daily adjusted irrigation schedule ( according to tuber initiation and development stage ) of potato, two - day , three - day and five - day cumulative irrigation. The irrigation strategies IS 1 , IS 2 , IS 3 , IS 4 and IS 5 with three split fertigation treatments showed mean percentage increase in fresh tuber yield (t/ha) as 5.5%, 11.55%, 18.6%, 25.6% and 0% from observed f resh tuber yield (t/ha) respectively . The irrigation strategies IS 1 , IS 2 , IS 3 , IS 4 and IS 5 with fertigation schedule with eight splits showed mean percentage increase in fresh tuber yield (t/ha) as 14.05%, 23.6%, 29.9%, 30% and 4.75% from observed fresh tuber yield (t/ha ) respectively . The change of sowing date to one week earlier 28th October for five irrigation strategies IS 1 , IS 2 , IS 3 , IS 4 and IS 5 with fertigation schedule resulted in - 14.09 %, - 0 . 72 %, 4.18 %, - 2. 2 % and - 2 7 . 8 7% change in fresh tuber yield( t/ha). The change of sowing date to one week later to 11 t h November for five irrigation strategies IS 1 , IS 2 , IS 3 , IS 4 and IS 5 with fertigation schedule resulted in 28.19 %, 32.54 %, 46.62 %, 35.49 % and 39.74 % change in fresh tuber yield(t/ha) , respectively. The IS 3 is showing maximum percentage change of 46.62 % in fresh tuber yield (t/ha) with 312 mm of irrigation water than observed for study area and cultivar. The further delay of sowing date to 18th and 25th November resulted similar decrease in fresh tuber yield . Therefore, based on these findings adoption of irrigation scheduling strategy IS 3 , cumulative two - day irrigation with fertigation schedule ( eight splits ) and change in sowing date to 11th November could be helpful to increase fresh tuber yield (t/ha) for SL 5 - 2 potato cultivar and study area |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis;no. WM-18-31 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Shrestha, Sangam |
| Examination Committee(s) | Datta, Avishek;Babel, Mukand Singh;Soni, Peeyush |
| Scholarship Donor(s) | World Bank;Punjab Agriculture Department, Pakistan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2018 |