Post-harvest weight losses of peruvian carrot roots Amarela de Carandai: effect of treatments on crop and after harvesting.
Zarate, N. A. H., Vieira, M. do C. and Araujo, C.
Ciencia e Agrotecnologia, Lavras, Volume 25, Number 6, 2001. Pages 1337-1342.
2001
บทคัดย่อ
An experiment was carried out at Farmer Science Experimental Centre of the Federal University of Mato Grosso do Sul, in Dourados-MS from November 13th to 21st, 1997, in order to establish peruvian carrot weight losses, 'Amarela de Carandai', in storage period. After harvesting, roots obtained from plants grown from March 21st to November 13th, 1997, under 46 e 44,000; 76 e 24,000; 76 e 44,000; 76 e 76,000; 100 e 60,000; 124 e 44,000; 124 e 76,000; 124 e 96,000 e 154kg of P e 76.000plants/ha treatments were treated with and without washing and with or without disinfection with copper oxichloride. A complete block design in a 9x2x2 factorial scheme was used, with two replications, resulting in 72 experimental units. The experimental units represented the field treatments and they comprised five roots: one of big size, two of medium size and two of little size. After washing, roots were packet in plastic nets and stored at room temperature, where the average maximum temperature was 28.8 deg C and the average minimum was 22.3 deg C. Weight losses were measured daily and roots showing infection symptoms were eliminated. Root weight losses occurred in the first two days after storage and they were attributed mainly to water loss rates. From the third day on these weight losses were attributed to infection at root basis. There was inverse relation between weight losses and P doses at 124kg per hectare and there was no relation between root weight losses and plant populational densities. Washed roots and non-disinfectioned roots with copper oxichloride showed greater weight losses than non-washed ones, specially between the third and the fifth day of storage. From the sixth day of storage on, roots showing infection with Rhizopus sp., Sclerotium sp. and Erwinia sp. were eliminated. Evaluations were done until the eightieth day of storage when it was observed more than 90% of weight losses on most UEs. Although the use of copper oxichloride was a success it was not so effective as a disinfectant under the conditions which the experiment was carried out.