BioAg Case Study No 12: John & Alison Wrate, Red Cliffs, Victoria. Sustainable approach improves yields and quality
The adoption of a biological nutrition program and an advanced irrigation scheduling system has paid major dividends for Sunraysia grape growers, John and Alison Wrate.
Running a small vineyard planted to two hectares of Chardonnay and 3.5 ha of Shiraz grape vines, the Wrates are achieving yields and quality well in excess of the district average.
John attributes his success to his willingness to use external consultants and adopt new ideas. “I have no aspiration to be the biggest, so I want to be the best little grower around,” he said. “When I started growing grapes 15 years ago, I was putting out a bag of this or that and relying on other people for free advice. Then I started using a consultant and later an agronomist who gradually introduced me to the BioAg approach. “I was already growing good quality fruit and yield, but I have always been interested in learning new things. I listened to what he had to say and picked up the benefits as we went along.”
BioAg markets a range of “biologically active” solid nutrients and fermented liquid cultures designed to produce living, healthy soils as the basis for optimum plant and livestock production.
One of the company’s key products is BioAgPhos®, a reactive phosphate rock that has been treated with a proprietary microbial culture. It provides an immediate and continued source of phosphorus, as well as improving microbial activity in the soil.
BioAg also markets a range of fermented liquid cultures which deliver essential nutrients and metabolites directly to crops, as well as stimulating microbial activity in the soil.
BioAg develops separate soil and vine nutrition programs each quarter based on soil and tissue analysis (see panel). Each program varies, but typically involves small but frequent applications of a range of BioAg and conventional inputs.
A typical BioAg Fertility Program for viticulture involves the application of 350–450 kg/ha* BioAgPhos, 100–160 kg/ha* sulphate of ammonia in spring. In addition, 1–1.5 L/ha* of BioAg Soil & Seed™ (a liquid treatment that encourages root development and soil microbial activity) and 15–20 kg/ha* of calcium nitrate (a rich source of calcium and nitrogen) is applied at 21-day intervals throughout the growing season via the sprinkler system.
During bud burst and flowering, 1.5–2.5 L/ha* of BioAg Balance & Grow®, a liquid microbial culture which stimulates vegetative growth and improves soil microbial activity, mixed with small amounts of calcium nitrate and micronutrients as needed, is applied as a foliar spray using an air blaster at 21-day intervals. This is followed by 1.5–3 L/ha* of BioAg Fruit & Balance®, a foliar treatment which delivers a rich source of nutrients to enhance yield and quality, and monoammonium phosphate (MAP) from late flowering to maturation.
While John is the first to admit he doesn’t fully understand how the BioAg approach works, he has no doubt about its benefits. “I firmly believe in the concept that healthy soils produce healthy plants – you can’t have one without the other,” he said. “You have to be prepared to implement the entire program to achieve the results and there is no doubt in my mind that it provides a better outcome than conventional fertiliser program. “I particularly like the way the BioAg program applies smaller amounts of nutrients throughout the season, rather than just a big chunk in spring and after harvest and then expecting that to last the whole season.
“The foliar treatments require a bit more work to apply but they add to the outcome. Overall, we are very happy with the way things are going. We know our soils are in extremely good condition and our vines look healthy all the time – and it shows in our yields and quality. “Things just seem to be ‘clicking’ for us. I am very lucky to have a contract with Orlando Wyndham. Two out of our last three Chardonnay crops were classified Semi-Premium 3, which goes into the Wyndham Estate Bin 222.”
The irrigation schedule, which delivers 11 ML/ha per season via overhead sprinklers, is supervised by Mildura-based consultancy, Yandilla Park, using the Enviro Scan system. “I am now using more water than most growers, but in doing so, I have significantly improved the productivity and profitability of the property,” John said. “Even though I use a lot of water, the drains never run, so the soils are holding onto it and the plants are making better use of it.”