Its easy to get tied up with the day to day chores of a farm and it seems to be inevitable more so if you’re running a dairy farm! But sometimes its good to take a walk out on the farm without any particular job in mind just to see how things are going. This is when I noticed some problems with a forage crop.
In late autumn we over-sowed some forage oats into the pasture in a couple of paddocks. But in July I noticed that the growth of oats was patchy. Some of the oats were tall and green but in other areas they were short and pale.
These forage oats were sown into pasture in Autumn but in winter growth was still very poor.
I decided to do some simple tests to find if there was any difference that might explain the variable growth. 5 samples were taken in areas of good to poor growth. Test were carried out for pH, water capacity, fresh organic matter and nitrate. For each site the growth was ranked – you can see this in the table below. Fresh organic matter represents the fraction that will break down easily to release nutrients. The method used can be seen at A simple test for reactive soil organic matter. Nitrate was extracted using water and measured using the Cadmium reduction method.
| Fresh organic | Nitrate-N | ||||
| Site | Oats growth | pH * | % water | matter ppm | mg/L ** |
| 1 | Tall / good | 5.3 | 40.7 | 1584 | 23 |
| 2 | Low | 5.3 | 25 | 873 | 41.5 |
| 3 | Poor | 5.3 | 25 | 1273 | 20.3 |
| 4 | Poor | 5.3-5.6 | 28 | 1660 | 0 |
| 5 | Tall / good | 5.3 | 37.5 | 2640 | 56 |
| * pH paper | ** actual concentration in the soil | ||||
| solution at each site | |||||
pH was low and that didn’t seem to affect oats growth. Some of the higher values for fresh organic matter are reasonably good for dairy farm soils. Fresh organic matter seems slightly higher at sites with good growth.
Nitrate is about 4.3 times higher than Nitrate-N so overall, some of nitrate levels in the soil solution are high. This is specially true for sites where soil water % is also high as it means overall higher nitrate levels. Site 2 doesn’t fit the pattern very well as nitrate levels are fairly high but growth is poor. perhaps there is some other factor important here.
Over-sown oats growing well at Site 5. Nitrate levels in the soil solution generally tested higher at sites with better growth.
This study provides some base line figures for the farm. This is useful for comparison between farms and for tracking pasture improvement. It doesn’t provide definite answers about the factors affecting pasture growth but can provide some insights and can suggest further study.