ESTIMATION OF MAIZE YIELD UNDER DIFFERENT SUB-SURFACE IRRIGATION REGIMES WITH CROPSYST MODEL


Wahab T. S., Çilek A., Acar M., Barutçular C., Sarıyev A.

The 4th International Congress of Agriculture, Environment and Health, Aydın, Turkey, 20 - 22 May 2021, pp.6

  • Publication Type: Conference Paper / Summary Text
  • City: Aydın
  • Country: Turkey
  • Page Numbers: pp.6
  • Çukurova University Affiliated: Yes

Abstract

Water is one of the resources that needs to be properly managed and it may be difficult to sustain it to the nearest future. In this regard, subsurface irrigation can help to conserve irrigation water. The objective of this study was to estimate the maize yield under different sub-surface irrigation regimes with CropSyst model. The agronomic and soil data for modelling maize yield on different irrigation regimes (I100: to field capacity, I75 and I50: to 75% and %50 of field capacity, respectively) were collected at the end of 2019 growing season from a research field (2017-2019). Results showed that soil physical properties, biomass and the leaf area index (LAI) weren’t significantly affected by irrigation regimes whereas some soil chemical properties and different productivity parameters were significantly affected. I100 had the highest yield in comparison to the other irrigation regimes. However, yields under I100 and I75 didn’t significantly differ from each other. The result of calibration and validation showed that CropSyst was able to adequately predict the yield of all irrigation regimes while it is wasn’t able to adequately predict LAI of I50. After calibration and validation, different scenarios were made. The planting date was altered by 8 and 9 weeks before actual planting date. I75 and I50 showed 15% and 19% improvement in yield respectively while I100 remained relatively the same. Throughout the crop’s lifecycle at constant different temperature levels, CropSyst predicted that with decreasing temperature from 35o to 27oC an increasing yield can be obtained. However, when the average daily temperature was increased by 1oC up to 35oC, yield in I100 remained relatively constant while the others steadily decreased. Results revealed that with %75 usage of irrigation and the right planting period the optimum productivity of maize can be achieved.