|Author:||Panda, P. K. ; Behera, S. K.|
|Book Group Author:||NA|
A comprehensive field investigation comprising of three experiments was done on groundnut crop over a period of three years with five different irrigation treatments, to determine an efficient strategy for management of irrigation water under water stressed conditions in a sub-tropical region. Layer-wise soil moisture status was continuously monitored to determine the crop water extraction pattern and thereby the irrigation management depth. Five irrigation treatments were maintained based on predefined levels of maximum allowable depletion (MAD) of available soil water. The treatments were 10% (T1), 30% (T2), 45% (T3), 60% (T4) and 75% (T5) maximum allowable depletion of available soil water. CROPGRO-Groundnut growth simulation model was calibrated and validated for further use. In order to asses the depth and time variation of soil moisture under different scheduling of irrigation, soil moisture was measured periodically in 15-30, 30-45, 45-60, 60-90 and 90-120 cm soil profiles using a neutron probe, while the soil moisture in 0-15 cm soil profile was determined by gravimetric method. It was observed that the plants extracted most of the soil moisture from 0-30 cm soil layer. Therefore, it was recommended that only 0-30 cm of soil profile be considered for scheduling of irrigation in case of groundnut grown in sandy loam soil in the sub-tropical regions. Measured and simulated results revealed that under water scarcity condition, plant extractable soil water depletion of more than 45% of ASW must be avoided even during non-critical growth stages to obtain high water use efficiency and net return. The calibrated CROPGRO-Groundnut model was found to be quite efficient in simulation of yield parameters and layer-wise soil moisture extraction pattern.
|Pages:||91 - 114|
|Journal:||Zeitschrift für Bewässerungswirtschaft|
crop yield, decision making, groundnuts, growth, irrigationscheduling, irrigation water, plant water relations, sandy loam soils,simulation models, soil depth, soil types, soil water, water deficit,water stress, water use efficiency, Arachis hypogaea, Arachis,Papilionoideae, Fabaceae, Fabales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, choice, irrigation management,peanuts, soil moisture, Field Crops (FF005) (New March 2000), PlantWater Relations (FF062), Plant Production (FF100), Soil Physics (JJ300),Soil Water Management (Irrigation and Drainage) (JJ800) (Revised June2002) [formerly Soil Water Management], Mathematics and Statistics (ZZ100)