Your search found 4 records
1 Ojha, C. S. P.; Rai, A. K. 1996. Nonlinear root-water uptake model. Journal of Irrigation and Drainage Engineering, 122(4):198-202.
Soil moisture ; Mathematical models ; Soil-water-plant relationships ; Water requirements ; Plant growth ; Irrigation scheduling ; Simulation
(Location: IWMI-HQ Call no: PER Record No: H018808)
Sound irrigation management requires information about root-water uptake patterns of different crops. In the existing literature, the extraction rate of soil moisture by the roots is assumed to be either constant or varying linearly with the root depth, during the crop period. However, both these models have limited application. With this in view, an empirical root-water uptake model in which the extraction rate varies non-linearly with the root depth is proposed. Using experimentally obtained soil-moisture depletion values for non-limiting soil-moisture conditions, it is found that the proposed model performs better than the constant rate models and linearly varying rate models of root-water uptake. Also, constant as well as linear extraction-rate models are found to be particular cases of the proposed model. Based on simulations for limited soil-moisture conditions, it is also found that the frequency of irrigation is sensitive to the use of root-water uptake models.
2 Swamee, P. K.; Ojha, C. S. P.. 1997. Ground-water mound equation for rectangular recharge area. Journal of Irrigation and Drainage Engineering, 123(3):215-217.
(Location: IWMI-HQ Call no: PER Record No: H020503)
3 Swamee, P. K.; Pathak, S. K.; Mansoor, T.; Ojha, C. S. P.. 2000. Discharge characteristics of skew sluice gates. Journal of Irrigation and Drainage Engineering, 126(5):328-334.
(Location: IWMI-HQ Call no: PER Record No: H026879)
4 Singh, S. K.; Mishra, G. C.; Swamee, P. K.; Ojha, C. S. P.. 2002. Aquifer diffusivity and stream resistance from varying stream stage. Journal of Irrigation and Drainage Engineering, 128(1):57-61.
(Location: IWMI-HQ Call no: PER Record No: H029706)
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