The art of small-scale irrigation
FarmBiz|February 2020
Southern Africa is a region in which water is scarce for most of the year. It rains for only four to five months of the year with frequent dry spells in between, while the rest of the year is hot and dry. Anyone with an ornamental or vegetable garden can get the most out of their garden by following a few simple water usage tips. These tips are also applicable to irrigation farming.
Fanie Vorster
The art of small-scale irrigation

Optimal water usage means that potential water loss is minimised, while plants still receive the water they need for optimal growth. This article discusses types of water loss, measures that can be taken to use water more efficiently and methods of small-scale irrigation.

Evaporation losses

As much as 50% of water can be lost to the atmosphere. In the presence of heat and wind, water that is sprayed or held in water bodies such as ponds, reservoirs or swimming pools, evaporates into the atmosphere. In order to minimise evaporation losses, irrigation should be scheduled early morning or late afternoon.

Micro- and sprinkler irrigation systems should be operated at the correct pressure to minimise wind drift of spray mist, which occurs when the pressure is too high. Water bodies should preferably be covered to minimise evaporation losses.

Unnecessary evaporation loss occurs from bare soil surfaces or in cases where the leaf canopy does not cover the soil sufficiently. This loss could be as much as 3mm on a hot day. For example, if 3mm soil surface is irrigated, the loss is 100%, and if 10mm is irrigated, the loss equates to 30%.

This loss can be minimised by placing a layer of organic mulch on the bare patches and by irrigating late afternoon or at night. Using indigenous trees to provide partial shade for ornamental gardens or a shade net structure for vegetable gardens, can also limit evaporation.

Preventing run-off losses

Run-off occurs when the application rate of irrigation exceeds the rate at which water can infiltrate the soil. It is evident in cases where an emitter or irrigation system irrigates the same spot for too long.

この記事は FarmBiz の February 2020 版に掲載されています。

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この記事は FarmBiz の February 2020 版に掲載されています。

7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。

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