Treatment | Rate/feddan | 2015 | 2016 | Average | Reduction % |
---|---|---|---|---|---|
Check (without) | – | 11.63a | 7.15a | 9.39 | – |
Compost straw (basal) | 2.1 t | 9.58b | 6.58b | 8.08 | 13.95 |
Mixed mineral (basal) | 500 kg | 4.85c | 3.92c | 4.39 | 53.25 |
Potassium silicate (basal) | 500 kg | 4.14c | 3.69c | 3.92 | 58.25 |
Biocide ore (two sprays) | 2 kg spray | 4.88c | 4.04c | 4.46 | 52.50 |
Magnesium silicate (two sprays) | 2 kg spray | 4.30c | 4.28c | 4.29 | 54.31 |