STEPHEN BELCHER, PGRO PRINCIPAL TECHNICAL OFFICER, COMMENTS ON THE PGRO RECOMMENDED LIST (RL) TRIALS FOR PEAS AND SPRING AND WINTER BEANS.
‘Something that may or does change’ is a dictionary definition of variable. Like many others, I have used ‘variable’ more than once to describe the 2016 season and data obtained from trials. Recommended Lists are based on variable data. While individual trials may exhibit low variability, when combined to produce a 5-year data set variability creeps in. Trials are grown in different seasons, geographic locations, soil types and weather conditions, all of which introduces variability. Pulse trials are often more variable than other crop species (they are indeterminate plants). To help interpret yield data, a Least Significant Difference (LSD) value is given on the RL tables and is given with a 95% confidence. If variety yields differ by more than the value of the LSD then there is statistically a difference between them. Conversely if the variety yields differ by less than the LSD then there is statistically no difference between them.
A mild and wet winter period was followed by an unremarkable spring with temperatures and rainfall close to average. The summer months were generally cool with average amounts of rainfall, but with some localised heavy storms. The hot weekend of 18-20 July curtailed flowering in many pea crops and sunshine levels were lower than normal.
Five trials went through to harvest. Yields were generally lower than in 2015, but the trial near Harwich bucked the trend and gave the highest yields at 5.16t/ha. Trials varied greatly in the degree of lodging that occurred and was greatly influenced by bursts of heavy rainfall.
Karpate a new white-seeded pea from Senova joins the RL with a P1 recommendation as the top yielding variety with a yield of 105% of controls. Kareni, top yielder in 2015 moves to 2nd year of provisional recommendation. Salamanca, Mascara and Gregor remain fully recommended. The aptly named large blue Bluetooth (LS Plant Breeding) joins Prophet, Daytona, Crackerjack and Campus as fully recommended varieties in that category. Two varieties LG Stallion (Limagrain UK) and Vertix (Senova) join the list with a 1st year provisional recommendation. LG Stallion tops the large blue yield rankings at 102% with Vertix 2% lower. Kingfisher moves to 2nd year of provisional recommendation. The small blue category makes a re-appearance on the RL with the addition of Greenwood (IAR Agrii) with a P1 recommendation. Yields are 6% lower than Prophet, but while seed is smaller it is on the large side for a small blue. Standing ability rates at only 4, similar to Crackerjack. Coloured flowered maple peas Mantara and Rose remain as fully recommended varieties. In the marrowfat category, Sakura and Genki remain fully recommended and top yielder in this category, Aikido moves to 2nd year provisional recommendation.
In the mild winter and where winter beans were planted early, vigorous growth gave rise to high levels of brackling, lodging and chocolate spot. Five of the nine trials went into the 2016 matrix. 2016 yields (5.73t/ha) were 17% higher than the 5 year average (4.89t/ha), with sites at Thorney and Hereford yielding close to 6.5t/ha.
Several candidate varieties were withdrawn from RL consideration by the breeders, so there were no new additions to the RL. Clipper was also withdrawn. In the pale hilum category, Tundra, Wizard and Honey remain as fully recommended varieties. Bumble moves from P1 to P2 recommendation and joins Tundra as the top yielding pale hilum types at 104% of controls. In the black hilum (feed) category Arthur was moved to the becoming outclassed category.
All ten spring bean trials were used in the 2016 matrix. 2016 yields (5.67t/ha) were marginally up on the 5 year mean (5.44t/ha). The highest yielding site was in Kent (6.52t/ha), but several others yielded over 6t/ha.
Pale hilum types Vertigo, Fanfare, Fury, Fuego and Boxer all remain as fully recommended varieties. New to the RL with a P1 recommendation is LG Cartouche (Limagrain UK). Yields were just 1% lower than the best, but it only has a 4 (same as Fuego) rating for downy mildew resistance. Lynx moves from P1 to P2 recommendation and joins Vertigo as the top yielding varieties. As in 2015 it has maintained a 7 rating for downy mildew resistance, the best amongst the pale hilum types. Pyramid and Bablyon were removed from the RL. Black hilum, tic bean Maris Bead remains with a full recommendation.