What are the constraints and applicability of irrigation scheduling under limited water resources, variable rainfall and saline conditions?
Irrigation scheduling is nothing but right time to irrigate so as to synchronise demand and supply, amount of water that has to be delivered in the field based on soil moisture level and history of the previous crop taken into consideration, place where irrigation water has to be given as per moisture status of the field(like in ridge furrow method, only furrows get irritated) and methods by which one can ensure provision of optimum moisture content in the rhizosphere to enhance production potential, productivity, benefits while sustaining water productivity without losses...In moisture deficit areas as per different soil types & topography; types of crop to be raised; socio- economic status and constraints of farmers; climatic conditions like ET losses; rainfall events; different methods like drip irrigation, sprinkler irrigation, surge irrigation, check basins, border strips, furrow & ridge methods etc may be incorporated as per convenience...
The need for increased food and fibre production in many parts of the world has resulted in an increase in irrigated areas regardless of water resource availability. For many irrigation projects, water becomes a limiting factor for development. Proper water management would maximize the water use efficiency of the irrigated crops. In some cases, drainage water or other low quality water might be used to irrigate salt tolerant crops. Scheduling irrigation under limited water resources and saline conditions requires a different approach from those known for unconstrained conditions. In addition, scheduling irrigation under variable rainfall requires weather forecasting and a flexible management system to cope with rainfall uncertainty. The following link includes more information about that, I hope it is useful:
https://www.fao.org/3/w4367e/w4367e0i.htm
Irrigation Management with Limited Capacity or Water Allocations | CropWatch | University of Nebraska–Lincoln (unl.edu)
What are the constraints and applicability of irrigation scheduling under limited water resources, variable rainfall and saline conditions?,kindly check this link.
https://agris.fao.org/agris-search/search.do?recordID=XF1997073651,this link may be useful.
These include field capacity, wilting point, saturation, available soil water and refill point. Immediately after a soil has been irrigated it is at saturation (Figure D9–3). Almost all of the soil pore spaces are filled with water and very little air remains.
https://www.dpi.nsw.gov.au › pdf_file
Chapter D9. Irrigation scheduling
Thank you so much from the heart... May Allah bless you.
In the backdrop of rapidly emerging global climate change induced water shortage scenario in agriculture (due to enhanced Evapotranspiration for global warming & Enhanced Per Capita Water Use Demand), the conventional approach for irrigation scheduling warrants realistic modifications with prudence to reasonably sustain required agricultural output with minimum moisture availability.
In this grim looming scenario of significant water shortages, the approach for Regulated Deficit Irrigation (RDI) to schedule irrigation is becoming increasingly relevant. The dynamics of RDI concept revolve around calibrated irrigation application doses in moisture-sensitive growth stages of a specific crop, while skipping or reducing irrigation in moisture-tolerant growth stages of the crop variety.
The RDI is banked on strategically harnessing the intrinsic Abscisic Acid (ABA) production traits by plant roots under elevated moisture stress condition, which favourably impacts stomatal conduction behaviour of crop (up to a limit) in restriction of moisture loss from the leaf stomatal pores in course of photosynthesis process. Obviously, RDI approach entails site-specific R&D for different crop varieties under varying agroclimatic conditions on pilot basis prior to its regular implementation.
- Badges
- Science method