Uso de reguladores de crescimento em mudas de pessegueiro.

Resumo O objetivo deste trabalho foi avaliar a efetividade na redução do desenvolvimento dos ramos em mudas de pessegueiro da cultivar Eragil

Disinfection of cuttings and of soil with eucalyptus oil on Peruvian carrot yield

Foi estudado o efeito do óleo de eucalipto na desinfecção de mudas e do solo sobre a produção e no controle de doenças durante o ciclo de cultivo da mandioquinha-salsa ‘Amarela de Carandaí’. Os tratamentos originaram-se do fatorial 2 (sem-MS e com-MC desinfecção das mudas em solução aquosa com 1% do óleo, por 35”) x 3 (sem- SSPOE e com-SCPOE pulverização do solo, antes ou depois do plantio, com solução aquosa com 2% do óleo). Foram realizadas colheitas das plantas aos 224 e 266 dias após o plantio-DAP. As massas frescas de folhas, rebentos e coroas foram semelhantes estatisticamente dentre as MS mas, dentro das MC, os maiores valores corresponderam às plantadas em SCPOE. As maiores produções de raízes comerciais aos 224DAP (5,94 e 6,90 t ha-1) e aos 266DAP (7,07 e 7,47 t ha-1) foram dos tratamentos onde as MS e MC foram plantadas em SCPOE antes do plantio. Foram observados sintomas de queima das folhas (associação de Alternaria sp. e de Septoria sp.) e de podridões das coroas e dos rebentos (Sclerotium sp.). Concluiu-se que, para se obter maior produção de raízes comerciais da mandioquinha-salsa, usando mudas desinfetadas ou não, deve-se pulverizar óleo de eucalipto no solo antes do plantio, embora sem esperar efeito sobre doenças foliares e podridões de final de ciclo.The effect of eucalyptus oil as disinfectant of cuttings and of soil on yield and disease control during cultivation cycle of ‘Amarela de Carandaí’ Peruvian carrot, was studied. Treatments were originated from 2 (without-MS and with MC disinfection of cuttings in aqueous solution with 1% of oil, for 35”) x 3 (without-SSPOE and with-SCPOE sprinkling on the soil, before and after planting, with aqueous solution with 2% of oil) factorial scheme. Harvests were done on 224 and 266 days after planting-DAP. Fresh masses of leaves, shoots and crowns were similar statistically among MS but, among MC, the highest values corresponded to those planted in SCPOE. The highest yields of commercial roots on 224DAP (5.94 and 6.90 t ha-1) and 266DAP (7.07 and 7.47 t ha-1) were from treatments where MS and MC were planted in SCPOE before planting. Symptoms of burning leaves (association of Alternaria sp and of Septoria sp) and of rot of crows and shoots (Sclerotium sp) were observed. It was concluded that, in order to obtaining a greater yield of commercial roots of Peruvian carrot, using cuttings that were disinfected or not, eucalyptus oil must be sprinkled on soil before planting, although without waiting effects on foliar diseases and rots at the final of the cycle.Facultad de Ciencias Agrarias y Forestale

Disinfection of cuttings and of soil with eucalyptus oil on Peruvian carrot yield

Foi estudado o efeito do óleo de eucalipto na desinfecção de mudas e do solo sobre a produção e no controle de doenças durante o ciclo de cultivo da mandioquinha-salsa ‘Amarela de Carandaí’. Os tratamentos originaram-se do fatorial 2 (sem-MS e com-MC desinfecção das mudas em solução aquosa com 1% do óleo, por 35”) x 3 (sem- SSPOE e com-SCPOE pulverização do solo, antes ou depois do plantio, com solução aquosa com 2% do óleo). Foram realizadas colheitas das plantas aos 224 e 266 dias após o plantio-DAP. As massas frescas de folhas, rebentos e coroas foram semelhantes estatisticamente dentre as MS mas, dentro das MC, os maiores valores corresponderam às plantadas em SCPOE. As maiores produções de raízes comerciais aos 224DAP (5,94 e 6,90 t ha-1) e aos 266DAP (7,07 e 7,47 t ha-1) foram dos tratamentos onde as MS e MC foram plantadas em SCPOE antes do plantio. Foram observados sintomas de queima das folhas (associação de Alternaria sp. e de Septoria sp.) e de podridões das coroas e dos rebentos (Sclerotium sp.). Concluiu-se que, para se obter maior produção de raízes comerciais da mandioquinha-salsa, usando mudas desinfetadas ou não, deve-se pulverizar óleo de eucalipto no solo antes do plantio, embora sem esperar efeito sobre doenças foliares e podridões de final de ciclo.The effect of eucalyptus oil as disinfectant of cuttings and of soil on yield and disease control during cultivation cycle of ‘Amarela de Carandaí’ Peruvian carrot, was studied. Treatments were originated from 2 (without-MS and with MC disinfection of cuttings in aqueous solution with 1% of oil, for 35”) x 3 (without-SSPOE and with-SCPOE sprinkling on the soil, before and after planting, with aqueous solution with 2% of oil) factorial scheme. Harvests were done on 224 and 266 days after planting-DAP. Fresh masses of leaves, shoots and crowns were similar statistically among MS but, among MC, the highest values corresponded to those planted in SCPOE. The highest yields of commercial roots on 224DAP (5.94 and 6.90 t ha-1) and 266DAP (7.07 and 7.47 t ha-1) were from treatments where MS and MC were planted in SCPOE before planting. Symptoms of burning leaves (association of Alternaria sp and of Septoria sp) and of rot of crows and shoots (Sclerotium sp) were observed. It was concluded that, in order to obtaining a greater yield of commercial roots of Peruvian carrot, using cuttings that were disinfected or not, eucalyptus oil must be sprinkled on soil before planting, although without waiting effects on foliar diseases and rots at the final of the cycle.Facultad de Ciencias Agrarias y Forestale

Slab rollback and microcontinent subduction in the evolution of the Zambales Ophiolite Complex (Philippines) : A review

New radiolarian ages show that the island arc-related Acoje block of the Zambales Ophiolite Complex is possibly of Late Jurassic to Early Cretaceous age. Radiometric dating of its plutonic and volcanic-hypabyssal rocks yielded middle Eocene ages. On the other hand, the paleontological dating of the sedimentary carapace of the transitional mid-ocean ridge – island arc affiliated Coto block of the ophiolite complex, together with isotopic age datings of its dikes and mafic cumulate rocks, also yielded Eocene ages. This offers the possibility that the Zambales Ophiolite Complex could have: (1) evolved from a Mesozoic arc (Acoje block) that split to form a Cenozoic back-arc basin (Coto block), (2) through faulting, structurally juxtaposed a Mesozoic oceanic crust with a younger Cenozoic lithospheric fragment or (3) through the interplay of slab rollback, slab break-off and, at a later time, collision with a microcontinent fragment, caused the formation of an island arc-related ophiolite block (Acoje) that migrated trench-ward resulting into the generation of a back-arc basin (Coto block) with a limited subduction signature. This Meso-Cenozoic ophiolite complex is compared with the other oceanic lithosphere fragments along the western seaboard of the Philippines in the context of their evolution in terms of their recognized environments of generation