Getting bulb onion allium cepa l . with low volatile oil propanethial

Abstract

The study points towards the obtaining of onion Alliums bulb stock L, with lowpropanotial volatile oil content, by means of the hydroponic production, using different single concentrations in the nutrients that contain Sulphur (S), because the generation of the propanotial is bound to the presence of this one. The propanotial, when making contact with the water, is disturbed giving propane, sulfuric acid and sulphydric acid. This last one created is the cause of the tear reaction. Also sulphur is bounded to the generation of alitosis by means of the substances dipropildisulphur or alilpropildisulphur. It had 6 beds (Long (125 cm.), wide (105 cm.), depth (10 cm.)) that contained a substrate sand mixture and rice husk, the density of sowing was varied between (10x10) and (20x20). The beds were divided in two lines (To and B), being To which counted on nutrition without lack of Sulphurs and the B with Sulphur deficiency in the feeding. Beddings were seeded and they were nourished during a period of three months. The harvest was made and it was begun to take the datareferring to the weight, polar and equatorial diameter, ph and brix degrees, a sensorial analysis was also made on the basis of the tests of kruskal-walls. The form of the onion which was normally nourished tended to be wide in diameter with a flattened tendency, those that suffered a modification in the sulfur provision were extended shaped. The onions with greater weight were those of treatment A. Treatments To had a strong aroma whereas the B not as much, even being very similar in perception.Treatments To generated Crying in the moment of the cut, whereas B was notmarked so. Treatments To presented the characteristic strong flavor, whereas the onions of treatment B did not present the flavor characteristic of the bulb onion. One concludes that if it is possible to obtain an onion with low propanotial acid content, by means of the modification in the nutrition with sulphur, with no need to make genetic manipulation or to count on varieties that fulfill this requirement.