Compost Trial - Part 2

Following on from initial work being conducted in-conjunction with Barossa Grape & Wine Association (BGWA) in 2017, we now have a 2nd stage mulch project on the ground.

The following windrow blends, made to conform with Australian Standard AS4454-2012, were applied onto a BGWA Demonstration Vineyard and the monitoring program will be continued for at least 3 years.

Windrow No.

Material

1

Tarac Steam Distilled (Spent) Grape Marc: Straws: Scalps**:  Council Green Waste

2

Tarac TPR: Straws : Scalps:  Council Green Waste

** Short fibrous vine residuals from another Tarac process.

 

 

 

 

 

 

 

The following shows mixing the Tarac mulch blend and adding recovered water with a windrow turner.

2

 

The natural properties of Steam Distilled (Spent) Grape Marc and TPR compare very favourably with one of the most commonly available commercial products on the market.

Nutrient availability – Commercial Mulch versus Tarac Mulches

 

Commercial Mulch

Tarac Windrow 1

Tarac Windrow 2

pH

7.6-8.0

8.6

8.4

Organic Matter %

80-90

70

62

Nitrogen, N %

0.6-0.9

3.18

3.44

Phosphorus, P %

0.12-0.14

0.52

0.57

Potassium, P %

0.5-0.8

1.07

0.96

After reviewing the windrow nutrients and vineyard soil baseline analysis results which were low in nitrogen and organic matter, appropriate application rates were calculated and applied to a local Shiraz vineyard in November 2018.

2

 

Spent Marc Mulch Blend spread over 7 rows of shiraz vines

 5  6

TPR Mulch Blend spread over 7 rows of shiraz vines

 7  8

 

Over the course of the trial BGWA will monitor vine & soil health and the wine made from the grapes will also be tested and judged against previous year’s results. Watch this space!

Contact me if you would like more information about Steam Distilled (Spent) Grape Marc or TPR applications for your purposes.

Brenton Mengersen