Grape pruning experiments carried on near Council Bluffs during the season of 1914 for a comparison of the “spur” with the "long cane and spur renewal” system, showed that the vines pruned alter the long cane system yielded, on the average, 41 per cent more grapes than the spur pruned vines. These results indicate that the long cane system is of value for the southwestern and other sections of Iowa where grapes are grown. However, it must be recognized that these results are for one year only. Further experiment with the two systems must be carried on before the long cane system can be recomended unreservedly.
Maney, T. J.
"Grape pruning—The spur and long cane systems compared,"
Bulletin: Vol. 14
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol14/iss160/1