Influence of the technique of direct covering with a perforated polyethylene film on yield and earliness of three carrot cultivars

In Universidade of Lisboa was estudied the influence of the technique of direct covering with a perforated polyethylene (PE) film on yield and earliness of three carrot cultivars was studied. The economic viability of the technique was also assessed. The field trial was conducted in randomized blocks, with three replications and it wasperformed in Alcochete. Both factors, cultivar and technique of direct covering with coverage removal of 91 DAS (L1) and 114 DAS (L2), were studied simultaneously. In order to quantify the effect of factors, the following variables were assessed: number of plants per m2, number of leaves per plant, length and diameter of roots, and green and dry weight matter of aerial parts and roots. To determine the earliness, the temperature under the covers and on the ground was monitored and the temperatures sums were determined. The technique of direct covering significantly influenced the number of leaves per plant, length and diameter of the roots, the root dry matter, yield and earliness. The Flakkee and Nantes cultivars presented the higher yields with 50.8 t/ha and 41.2 t/ha, respectively. The Flakkee treatment with L1 was the most productive with 63.6 t/ha. The technique of direct covering proved to be economically viable in Flakkee and Nantes. In Chantenay, the less productive with 32.1 t/ha, the technique is only viable on a differentiated product. ? Original tittle, authors and sourcesInfluence of the technique of direct covering with a perforated polyethylene (PE) film on yield and earliness of three carrot cultivarsSaturnino, S. & Dias, J. S.Instituto Superior de Agronomia, Universidade de Lisboa.Carrot and other Apiaceae International Symposium, 17-19 September 2014, Angers, France,?http://www.symposium-carrot-apiaceae2014.fr/ Picture by?www.naturalsantarita.com ? Key wordsPoscosecha??????? postcosecha????? postharvest?????? na-oes? ?????????????? ?????????????????????? post-r?colte????? ????????????????????????????????????????????? na-oogst???????????? post-raccolta???? Obr?bka po?????? p?s-colheita????? ???????????????????????? hasat sonras????? ??????????????? Ernte???? ????????????????????????? ?????????????????????? postcollita?????????? poskliz?ov頠???? ?????? ????????????????? ??????????????? nakon branja???? pozberov頠?????????????????????? obdelovanje zemlje po??????????????? post-colleita????? ??????????????? pascapanen??????????????? ?il?onn postharvest??????? ????????????? p?c ra?as???????????? derliaus apdirbimas polepas tuai??????????? ??????????? post-recoltare???????????? ???????????? ???????????????????????? ?????????????????????? ??????????????????????????? sau thu ho?ch??????????????? ?????????????????????????????? zangemva kwenkathi yokuvuna Zanahoria???????????????????????? carrot??? wortel? ?????????? ?????????????????? karoto? carotte????????????????????? ??????????????????????? carota?? marchew??????????? cenoura?????????????? ??????????????????? havu砠? ???? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??