5.21 TOMATOES - PRECIOUS DRIP SYSTEM FOR THE PRODUCTION

 

SMART FARMING SOLUTIONS   Successful with consultant

LESSON 5.21 TOMATOES - PRECIOUS DRIP SYSTEM FOR THE PRODUCTION




 

Precision Production Calls for SUBSURFACE DRIP IRRIGATION  

 

Maximizing brix and yield required precision production practices. This balance is only possible when precision irrigation is used – an irrigation system that optimizes flow-rates, dripper spacing and the best system for the application.

 

Optimizing flow rates and dripper spacing:

·         Knowing your soils enables you to choose the right dripper flow rate (flow per dripper) and spacing (distance between drippers) for your crop.

Getting this combination right is important to:

·         Ensure all tomato plants receive water and nutrients at their root zone.

·         Minimize leaching of water and nutrients through the soil profile.

·         Avoiding overwatering or under watering which leads to poor uniformity.

·         It is a common belief that applying more water will cause it to spread further laterally. However generally this is not the case, especially in sandy soils. 

By applying dye through a SUBSURFACE DRIP IRRIGATION and then cutting away the soil, we can see how water moves.

 

Application 1  Low flow rate, close spacing, low water application

 

·         Drip line: 1 lph drippers at 20 – 30 cm spacing

·         Water applied: 0.5 l

·         Water movement:  Spread: 18 cm, Depth: 29 cm

 

Application 2 High flow rate, wide spacing, high water application

·         Drip line: 8 lph drippers at 50 cm spacing

·         Water applied: 2.0 l

·         Water movement:  Spread: 23 cm (+5 cm from Application 1)   Depth: 60 cm (+31 cm from Application 1)

 

In the above test, you can see in Application 2 that using higher flow drippers and wider spacing between drippers only results is in a 5 cm wider spread of water, despite applying four times the volume of water. Additionally, there was significant water loss through the soil profile. The root zone of a tomato plant is only 250 mm deep, meaning that all water movement below this point is lost water and nutrients. In other words, most of the water in Application 2 using the high flow, wide distance system was lost and never reached the root zone.

For a precision drip irrigation system, it is recommended to have close dripper spacings and lower flow drippers. Generally, a 0.75 – 1.0 lph flow-rate is sufficient with dripper spacing of 20 cm for sandy soils and 30 cm for heavier soils. 

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For successful SMART FARMING see 70 lessons about SUBSURFACE DRIP IRRIGATION.
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Application 1


Application 2








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