Spinach for canning: the relation of physical and chemical properties to quality

Geise, F.W.

Maryland Agric Exp Sta Bull 320: 303-326

1930


Accession: 025510761

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Abstract
Of the 3 crops of spinach, fall harvested, overwintered, and spring sown, possible under Maryland conditions, that harvested in the 1st half of the fall produced the highest yields of trimmed spinach, while the overwintered crop averaged low in yield. Quality declined rapidly in the fall crop with the advance of the season, this loss being accompanied by a decline in moisture content, an increase in percentage of total and invert sugars, and a decline in total hydrolyzable substances, but with no evidence of any correlation between season and the percentage of crude fiber. Total and invert sugars were lower in young than in mature leaves, while the percentage of total nitrogen was greater in the young leaves. From storage experiments at controlled temp. the author concludes that the high percentage of total and invert sugars in the fall crop may be correlated with low temp. prevailing at that time. Spinach stored at 26° F. gained slightly in moisture, while at 40° and at 60-70° moisture was lost in direct proportion to rise of temp. Loss in invert and total sugars was greatest at the higher temps. Practical deductions are offered.