Evaluation of selected grass and broadleaf crops suitable for fodder as interception crops where winery wastewater is re-used for irrigation


Project Number

P04000027

Project Title
Evaluation of selected grass and broadleaf crops suitable for fodder as interception crops where winery wastewater is re-used for irrigation

 

Project Leader

Fourie, J C
Team members

Fourie, J C
Lategan, V
Adams, K A
Sassman, L W
Freitag, K
Baron, F

Project Description

Cellars generate approximately 15 330 million litres of effluent per annum. Although constructed wetlands for the treatment of cellar effluent is low in comparison to other treatment systems, the construction of a 57 m3 pore volume wetland may still amount to approximately R 51 000, excluding VAT and labour. Irrigation of crops with winery wastewater reduces energy use and treatment cost. However, irrigation with winery wastewater needs to be optimized to minimize leaching, whilst maximizing nutrient removal, especially potassium (K) produced by cleaning agents, by means of a catch crop.

Pennisetum glaucum cv Babala (pearl millet) established as a summer catch crop, followed by Avena strigosa cv Saia (oats) established as a winter catch crop and removed significant amounts of K from a sandy soil, whilst generating additional income. These species, however, consumed significant amounts of N. Therefore, other grain and N-fixing crops adapted to loamy sand to sandy clay loam soils that reaches peak growth during the time in which the highest volumes of wastewater is produced, need to be identified.

The aim of this study is to identify fodder producing crops that will intercept sufficient amounts of K (and other elements) applied via irrigation with augmented cellar effluent on loamy sand to sandy clay loam soils in both a vineyard and on open land. The selected fodder producing crops should minimise/prevent leaching and build-up of especially K in these soils and should not have a negative impact on grapevine performance and wine quality.


– Record End –

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