Harvest Results 2017 - First OSR trial results are published online.
Winter oilseed rape
The first AHDB Harvest Results for trials of winter oilseed rape (OSR) have been published online
. OSR trials can be more variable than cereals and care must be taken when drawing conclusions on limited data. The four-year average gross output yields are a better measure of variety performance over several seasons, since this week’s oilseed rape results have information from just two trials from Oxfordshire and Suffolk. Yields are reported as a gross output, which is the seed yield adjusted for oil content. The values are represented as a percentage of the control varieties – Trinity, Campus, PT211 and PR46W21. This year oilseed rape gross output yields are represented as UK yields as opposed to the east/west and north regions in previous years.
The 2017 gross output value of 5.41t/ha is the same as the four year average. The Oxfordshire site has a gross output of 5.68t/ha and the Suffolk site has an average gross output of 5.14t/ha.
In 2017 at these two sites, the restored hybrid varieties Wembley (110%), Windozz (109%), and Alizze (106%) and the conventional variety Flamingo (106%) have performed well.
Based on the four-year average values, where new 2017 data is available, the highest-yielding varieties to date are V316 OL (108%), Alizze (108%), Windozz (108%), Elgar (107%) and Flamingo (107%).
Looking at the four-year averages, the clubroot resistant variety Mentor has a gross output of 99% and the turnip yellows virus resistant variety Amalie has a gross output of 97%. The semi-dwarf variety DK Secret has a gross output of 98%.
Gross output values for the candidate varieties in 2017 based on the limited information show good yields from Django (109%) in 2017 and 108% on four-year averages. This variety is a conventional variety up for recommendation for the UK. The turnip yellows resistant candidate Architect has also performed well at 105% in 2017 and 103% on the four-year averages.
Winter barley 2017 Harvest Results – trials follow the five-year average
The winter barley trial results include sites from Cambridgeshire, Dorset, Cheshire and Morayshire.
The overall yield average from five trials in 2017 is 9.58 t/ha, contributing to a five-year average yield of 9.60 t/ha. Yields in 2017 therefore look to be performing similarly to the five-year average.
Calculating yield results
Yields are represented as a percentage of the control varieties. In 2017, the control varieties comprise two malting varieties, Talisman and SY Venture, the six-row hybrid variety Volume, the six-row conventional variety KWS Meridian (no longer on the Recommended List) and the two-row feed variety KWS Glacier. The average of the yields from these varieties is represented as 100%. The current 2017 values now show yields based on one season from nine sites, giving us a better picture of yields in 2017. The five-year average remains a better measure of their performance over a range of seasons.
In 2017, the six-row hybrid feed varieties Belfry (113%), Bazooka (112%), and Sunningdale (111%) are all performing well, as is the conventional six-row variety, Funky (110%).
The two-row feed varieties with the top yields are California (107%), and KWS Orwell (105%) and KWS Infinity (103%). The 2017 season seems to have favoured California at a range of sites.
Two-row malting varieties are judged more on their quality than outright yield. Based on this information, Craft has a yield of 98%, Talisman 95% and SY Venture 92%.
Using the five-year average
When selecting varieties for next season, the five-year average values give a better representation of performance in different seasons. The six-row hybrids Bazooka (109%), Sunningdale (109%) and Belfry (108%) and the six-row conventional variety Funky (107%) are performing well. Looking at the two-row feeds, KWS Orwell (104%) Surge (103%) and KWS Infinity (102%) continue to headline on yield. KWS Creswell which is recommended for the north has performed well at 102%.
Five-year average results also provide a better measure of new varieties. The candidate six-row varieties are also achieving good yields in the five-year average figures, with Libra (six-row hybrid) at 107% and KWS Astaire (six-row conventional) at 108%. New candidate malting varieties compare favourably with established varieties based on the five-year figures, with Coref at 99% and Hiverac at 98%.