Empirically derived crop coefficient values for tomatoes grown in protected structures under climatic condition of Jalandhar, Punjab

Authors

  • VIKAS SHARMA Department of Soil Science and Agricultural Chemistry, School of Agriculture, Lovely Professional University, Jalandhar, 144001, Punjab
  • NITIN M. CHANGADE Department of Soil Science and Agricultural Chemistry, School of Agriculture, Lovely Professional University, Jalandhar, 144001, Punjab

DOI:

https://doi.org/10.54386/jam.v27i2.2953

Keywords:

Crop coefficient, Protected structures, Crop evapotranspiration, Reference evapotranspiration, Growth stages, Polyhouse

Abstract

In modern agriculture, calculating the Crop Water Requirement (CWR) for tomato crops under protected cultivation often relies on FAO-56 crop coefficient (Kc) values. However, these values may not fully account for the unique microclimatic variations within protected structures, creating a need for adjusted Kc values. This study aimed to develop growth-stage-specific Kc values for tomatoes grown under protected conditions in Jalandhar, Punjab. Results showed that daily microclimatic parameters, excluding relative humidity, were consistently higher in open-field conditions and lowest within protected environments. Pooled data indicated growth-stage-specific Kc values of 0.51, 1.05, and 0.61 for shed net houses; 0.53, 1.08, and 0.63 for polyhouses with insect net ventilation; and 0.51, 1.10, and 0.67 for open-field conditions, corresponding to the initial, mid, and late growth stages, respectively. Water consumption was highest during the mid-stage, decreasing progressively toward crop maturity. These empirically derived Kc values support precise CWR calculations through climatological irrigation scheduling, benefiting tomato cultivation in protected environments and similar agro-climatic regions. The development of growth-stage-specific Kc values provides a scientific foundation for improving irrigation water management and resource efficiency, offering valuable insights for farmers, policymakers, and water resource planners.

References

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Published

01-06-2025

How to Cite

SHARMA, V., & CHANGADE, N. M. (2025). Empirically derived crop coefficient values for tomatoes grown in protected structures under climatic condition of Jalandhar, Punjab. Journal of Agrometeorology, 27(2), 157–162. https://doi.org/10.54386/jam.v27i2.2953

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