Methods of Irrigation
1. Flood irrigation:
- In Flood irrigation method, free flow of irrigation water is allowed in the fields in all directions.
- It is practiced in the flat planted cane, but water loss is high.
Large furrow system:
- In this system, water is directed between the rows of the crop and permitted to soak down to the roots of the plants.
- The length of each row is determined by soil permeability and by the steepness of the slope.
- On slopes of up to 0.1% this system is quite successful.
- It consists of small beds with ridges in them.
- Both the ends of ridges open to allow free movement of water from one furrow to another.
- This method is useful in places where the quantity of water is restricted and the field has mild slope.
- In this system, furrows are made along adjusted contour lines.
- It is popular in regions where land is undulating, especially in Maharashtra.
- This consists of formation of big ridges and furrows after about 3 months of planting (prior to the grand growth period) and the furrows are inter-connected in the shape of a serpent.
- The water is let in at one end virtually comes out after irrigating the entire field.
- This method is practiced on adsali crop of Maharashtra and north Karnataka and eksali crop in Belgaum region.
Alternate skip furrow method:
- In skip-furrow method, sugarcane is planted in flat beds as usual and after germination, 45 cm wide and 15 cm deep furrows were made in alternate inter row spaces.
- There is considerable saving of water in this method of irrigation.
- In Autumn planting, there are 7 irrigations in plains (5 before rain and 2 after rain)
- In spring planting, there are 6 irrigations (4 before rain and 2 after rain) - one irrigation at tillering is must.
- For Tarai area- there are 3 to 4 irrigation, 2-3 before rain and one after rain.