Agrivision Soya Trial – Interim Field Report
Client: Agrivision Somahwe Farm, Mpongwe
Crop: Soya Beans
Product: ACF-SF+ / ACF-SF (Dryland Kits)
Trial Application: Approximately 200 hectares treated with 20l/ha ACF-SF+ at planting and 20l/ha ACF-SF 45 days from planting. 50% of each pivot as trial and 50% as control.
ACF-SF+ applied via pivot at planting
ACF-SF applied via pivot at 6 weeks
Application Notes – ACF-Dryland Kits
The intention was to treat 50% of each pivot to total approximately 200 hectares for the trial.
ACF-SF+ was applied to 50% of each pivot at planting, applied through irrigation
ACF-SF was applied to 50 % of each pivot, 45 days from planting. Due to a technical problem with pivot positioning, the application was offset by 90 degrees and thus quartering the trial area into 4 sections as shown in the picture above.
Pivot 42 & 43 have had technical problems due to sub station explosion. Pivot 42 foliar application being applied on the 15th Jan 2019. Pivot 43 foliar application subject to pivot repair completion.
Pivots 40 and 44 were chosen for root sampling. Each pivot is dived into four trial blocks, two samples (approximately 6-8 stalks per sample) were taken from each control area and a further two samples were taken from the area treated with both ACF-SF+ and ACF-SF.
The samples were removed by spade, these were chosen and removed by Stefan. The root samples were washed in a bucket to remove soil and to preserve root structure.
Photographs were taken of the sample field and of the root samples.
Field observations and discussion
It was brought to our attention that there seems to be a problem with Tap Root development across the farm, Stefan suggested that this could possibly be due to early nematode damage to the tap root.
There are some areas in the field with drainage problems, this can be seen in the crop development and there is some fungi and alae present in these areas. It must be added that this is the height of the rainy season.
Root samples taken at two different areas in the control sections of the selected trial pivots show that there is impeded tap root development, this can be seen in the pictures below. The treated section however shows better tap root and nitrogen nodule development.
Pivot 40 showed uneven growth, this is due to water logging and old ant hill areas. There was however still a noticeable difference in the growth uniformity between the control and the trial section.
Some leaf blight was observed in all of the sampled areas.
Pivot 40 - Control Pivot 40 - ACF-SR+ / ACF-SR
Pivot 40 - Control
Impeded tap root development
Some nitrogen nodule development
Hair root close to the surface (0 – 50mm, in some cases to 75mm)
Pivot 40 – Treated
Tap roots developed in most samples, up to 250mm in length
Some nitrogen nodule development
Tap roots developed – most tips broken off when removed
Pivot 44 – Control
Tap root development impeded in 7 of 12 samples,
Some nodule development
Pivot 44 – Treated
Full tap root development on tap root system
Good nitrogen nodule development
Tap root development Nitrogen Nodule development on the tap root system
Some leaf blight was observed in all of the sampled areas
The soya crop will be harvested from mid-February to mid-April 2019
Wheat will be planted from mid-March to mid-May 2019
Early nematode damage to the tap root systems across the farm, the fact that most of the farm was plagued by tap root issues was discussed in depth.
There is a marked difference between the control and treated root systems, this was observed by the protruding tap roots from all the treated samples dug out and before washing.
Nitrogen nodule development apparent in control and treated section, nodules developed in upper section of control root sections whilst nodule development in treated section is along the tap root
Some Leaf blight is evident in both control and treatment – immediate soil remediation should be considered before the next crop is planted.
Control root systems are short, have impeded tap root growth and with fine hair root development from the surface to a depth of 50mm.
Treated root systems show a fully developed tap root system averaging 200 – 250mm, nitrogen nodule development along tap root.
We would like to propose that soil samples are taken from the control and treated sections, then have these analysed for nematode counts.