Rural

Water-efficient varieties - John Lacy

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August 24, 2017

Koshihikari and Opus rice varieties had the highest water efficiency incomes per megalitre in the 2015 and 2017 harvests, according to the Finley Discussion Groups results.

The results show the 2017 Koshihikari crops had a water efficiency income of $346/ML assisted by the high $515/tonne price.

The result was based on an 8.4t/ha yield and lowish irrigation water use of 12.5ML/ha. This was assisted by a drill sown delayed permanent water (DPW) crop which yielded 9.1t/ha with low 10.6 ML/ha water use.

The East Murray Valley SunRice yield of 7.1t/ha supported the group results with Koshihikari having a water efficient income of $293/ML.

In 2015, the last time most group farmers grew rice, Koshihikari had a water efficient income of $451/ML.

The yield was 9.6t/ha and irrigation water use 11.2ML/ha. The East Murray Valley SunRice yield of 8.5t/ha also supported the group results with Koshihikari having a water efficient income of $398/ML using the group irrigation water use.

Opus in 2017 with a $320/tonne price was the variety with the second highest water efficiency income of $268/ML.

This was based on a 9.8t/ha yield and low irrigation water use of 11.7ML/ha.

A DPW drill crop had the highest water efficient income of $320/ML from 8.3t/ha yield and 8.3ML/ha water use.

The East Murray Valley SunRice yield of 9.4t/ha supports the group results with Opus having a water efficient income of $257/ML using the group irrigation water use.

In 2015 Opus also had the second highest water efficient income of $408/ML. The yield was 10.5t/ha and irrigation water use 11.4ML/ha.

The East Murray Valley SunRice yield 9.6t/ha also supported the group results with Opus having a water efficient income of $373/ML using the group irrigation water use.

Langi in 2017 also had a high water efficient income $274/ML but this was based on only two crops.

■John Lacy is a Finley-based agricultural consultant.

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