With the tractor repaired, I was keen to press on and continue our journey along the path of improved soil health. My next project was to test the effectiveness or ripping lines in one of our flat paddocks. I have previously experimented with ripping lines on some of the slopes late last year, and the initial results are promising. Moisture is remaining in these contours for longer than other areas, and we are starting to see green bands along those rip-lines. See story here: https://rockfarming.com/2019/01/13/school-holidays-on-the-rock-farm/
The paddock for this experiment is a 1.8 hectare flat alluvial plain, with deep soil. This flat area is the best soil on the Rock Farm – but in a short cloud burst we had before Christmas (35mm rain in 30 minutes), water sheeted across this paddocks. Barely any of the water soaked in before it made its way into the creek. (https://rockfarming.com/2018/12/17/of-droughts-and-flooding-rains/)
The paddock was heavily grazed for a week. Then I spent an hour or so chipping out thistles and the odd serrated tussock to get the paddock ready for ripping.
A couple of hours with the tractor pulling hard in 2nd gear low range, and the rippers had opened up the soil in the 1.8 hectare flat. I ran the lines about 5 metres apart, in a concentric spiral. In areas where the soil was compacted, the rippers barely scratched the surface, however in other areas they penetrated a good 30cm or more into the soil.
The purpose of this is two-fold. It aims to aerate the soil, increasing the microbial activity within the soil, thereby improving the availability of nutrients for grass. It also allows moisture to penetrate deep into the soil, reducing run off and storing moisture in the soil for longer. Pat Coleby is one of the many authors who recommend ripping lines along contours and I thought it was worth the experiment. The main difference is she recommends ripping after rain… but with barely any rain falling this month, I figured I was best to see if we could open some of the soil up and ensure if any rain does fall, we could capture it.
Interestingly another technique to aerate the soil relies on grazing management. As cattle eat the longer grass, the plant’s roots die off, and as they rot, the soil is opened up allowing earthworms to do the hard work.
It was interesting to rip a section of a much smaller paddock that the cattle had been in a couple of weeks earlier. Whilst they had compacted the soil around the water trough, in the areas where the grass had been tallest (and since eaten), the rippers penetrated deepest, and didn’t turn the soil over. This is a sign of deep friable soil – the best kind. This encourages me that we are doing good things for our soil health, and that our soil rotation is working.
Now I just have to keep my fingers crossed for rain!