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Uncertainty over Western Cape wheat conditions

Jul 24 2017 17:55

Cape Town - There is a strong possibility that, in the next few years, parts of the Western Cape’s wheat-growing areas may be affected by poor rainfall conditions, which could lead to poorer harvests.

According to Johan van den Berg, agricultural meteorologist at Santam Agriculture, rain fell in the last few years at the right time which, on the whole, resulted in good wheat production over the majority of the Western Cape.

However, there are real indications that in the coming few years, as part of a dry cycle, poorer rainfall may occur during the active growing season, especially in the Southern Cape.

“During the past few years, average to above-average rainfall fell during the growing season in the Western Cape wheat district, although in 2015 the Swartland area of the Western Cape had below-average rainfall,” said Van den Berg.

The Swartland’s wheat harvest fell to 368 000 tonnes in 2015, in comparison to harvests of 593 000 tonnes in 2014 and 558 893 tonnes in 2013.

Although the Swartland district had average rainfall in 2016, Van den Berg explained that very good rain fell in September, which contributed to a leap to 644 000 tonnes in the area’s harvest for the year.

READ: Why SA won't starve for now

September critical

September is a critical rainfall month for Western Cape wheat, as the plants are then in their re-production phase and drought-induced stress can inflict great damage.

Neel Rust, chief operating officer of Laeveld Agrochem, explained that berg winds, which normally come in August, can also have a negative effect on the wheat harvest. The effects of cold fronts which move across the country, together with the start of the warmer summer temperatures, often cause the dry land/berg winds.

Wheat is predominantly cultivated in the Western Cape’s Swartland and Rûens growing areas, but also in the Southern Cape, as far as Mossel Bay.

According to Van den Berg, the climatic cyclical effect over the long-term has the greatest effect on the average rainfall variance and, up until now climate change has played a lesser role.

Van den Berg is of the opinion that the expected weaker rainfall situation over the next few years will be more concentrated in the Southern Cape than the Swartland production areas.

The Western Cape is the biggest contributor to the country’s wheat harvest. The National Crop Es-timates Committee’s latest figures show that the Western Cape harvested 1 098 200 tonnes of wheat in 2016. The country’s total harvest estimate for 2016 stood at 1 910 000 tonnes.

According to Rust, SA is a net importer of wheat, which means that the country must import wheat to fulfil the market’s demand. At the moment, the yearly demand stands at more than three million tonnes.

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