Journal or Book Title
Transactions of the ASAE
The effect of water-table management practices on leaf photosynthesis and corn yield was investigated under two different field conditions in 1989 and 1990. In one field, water-table depths were maintained at 0.3, 0.6, and 0.9 m in field lysimeters during the growing season. In the other field, average water-table depths of 0.2, 0.3, 0.6, 0.9, and 1.1 m were maintained through subirrigation. Photo-synthesis measurements were made regularly during the growing season, and yield data were collected at harvest. In 1989, a relatively dry year, photosynthesis rates were higher at shallow water-table depths than at deep water-table depths. In 1990, a very wet year, photosynthesis rates were not significantly different for water-table depths between 0.3 and 0.9 m, but rates decreased significantly for water-table depths shallower than 0.3 m. Statistical analysis indicates that water-table effects on photosynthesis rates were not consistent. However, effects of various water-table depths on photosynthetic water-use efficiency (PWUE) were highly significant in both dry and wet seasons. Corn yields increased with increasing water-table depths. At water-table depths of 0.2 to 0.3 m, corn yield decreased significantly. In both dry and wet seasons, effects of water-table treatments on grain yield were highly significant and significant relationships were obtained between PWUE values and yield.
American Society of Agricultural and Biological Engineers
Kalita, Prasanta K. and Kanwar, Rameshwar S., "Shallow Water Table Effects on Photosynthesis and Corn Yield" (1992). Agricultural and Biosystems Engineering Publications. 696.