Simulation of Growth and Yield of Upland Rice Grown under Irrigated Lowland Condition

Abstract

Upland rice grain is favorable food product for health concern people. However, it hard to find in public market because grains from production were normally used for household consumption among farmer who grow them. In order to expand the production in irrigate lowland area to serve those healthy concern people, it is necessary to study the potential yield of upland rice varieties. Objective of this study was to validate Purple Glutinous Rice Model (PGR) in simulating the response of upland rice in terms of phenology, growth and yield grown in irrigated lowland condition. Five selected varieties of upland rice namely Sew Mea Jan, Dang, Kum, Khao and Luang Hom were grown at experimental field Lanna Rice Research Center, Chiang Mai University.
Simulation of total dry matter using PGR model showed the increasing trend from transplanting till maturity with similar to observed data. It was found that simulated yield and straw weight were higher than observed values for all varieties. The simulated yield was 427 – 577 kg/rai whereas the average observed yield was 266 – 444 kg/rai. Similarly, simulated straw weight was 599 – 735 kg/rai and the average observed straw weight was 391 – 600 kg/rai. Such results showed greater simulated yield and straw weight than observed data indicated the ability of rice varieties could adapt to lowland environment. This study demonstrates that PGR model can be used as a tool for evaluating performance of upland rice grown in difference environments.