Increasing onion size
This year one of my goals is to get the garlic and onions (drying varieties, not greens) to grow larger. I'm planting them in a sandy-loam soil with a lot of organic matter and a nutrient content that is testing well. My question is about irrigation.
Some advice is to water amply in spring and then sparingly in summer - to avoid fungal problems that can occur with alliums. In the past we've had the occasional year where fungus has ruined most of the garlic, but never had this sort of issue with onions.
By the way, onions are Copra and Walla-Walla (former as a keeper, latter as a summer globe onion), and Redwing as a decent keeper red. All are planted in slightly raised beds, with Walla Walla seedlings 5" apart in rows 5" apart, the other varieties are 4" apart in rows 4" apart. (Garlic varieties are Italian Porcelain and Russian Red.)
I notice that "industrial" onion fields - conventional chemical farms - often seem to be irrigated fairly heavily. The advice to water sparingly seems, perhaps, more often to be found on internet sites aimed at home gardeners. I'm not sure when/if the conventional farmers may cut back on irrigation.
This post was edited by joel_bc on Mon, Apr 21, 14 at 11:02