RESUMO -O trabalho objetivou avaliar a fertilidade e as reservas de C e N em gemas de ramos, na entrada da dormência e dormência plena, das variedades 'Cabernet Sauvignon' e 'Nebbiolo'. Em um vinhedo de 'Cabernet Sauvignon' e outro de 'Nebbiolo', em São Joaquim (SC), foram coletadas gemas em ramos de ano, em duas épocas: na entrada da dormência (maio de 2012) e na dormência plena (agosto de 2012). Os tratamentos foram: (T1) gemas basais (1ª a 5ª); (T2) gemas medianas (6ª a 10ª), e (T3) gemas distais (11ª a 15ª). Em cada planta, foram coletados três ramos, um localizado no lado esquerdo, outro no lado direito e o terceiro no centro da planta. A presença ou ausência de primórdios de inflorescência foi realizada apenas nas gemas dos ramos coletados na dormência plena, usando um estereomicroscópio. Foram quantificados em gemas na entrada da dormência e na dormência plena, os teores de carboidratos solúveis totais, amido, proteínas totais, carbono orgânico total, nitrogênio total e relação C/N. A 'Cabernet Sauvignon' apresentou o maior número de gemas férteis na porção mediana dos ramos de ano. Mas, na cultivar 'Nebbiolo', o maior número de gemas férteis foi observado nas porções medianas e distais do ramo. As maiores concentrações de reservas de carbono nas gemas da 'Cabernet Sauvignon' podem ser responsáveis pela maior fertilidade de gemas. A carga de gemas férteis na 'Cabernet Sauvignon' pode ser aumentada com a poda de inverno média a longa e, na 'Nebbiolo', com poda longa, acima da 6ª gema, como o Guyot. Termos para indexação: Carbono, nitrogênio, carboidratos, Vitis vinifera L. FERTILITY AND CARBON AND NITROGEN RESERVES IN BUDS OF 'CABERNET SAUVIGNON' AND 'NEBBIOLO' GRAPEVINE SHOOTSABSTRACT -The aim of this study was to assess the fertility and C and N reserves in buds of shoots at the beginning of dormancy and complete dormancy of 'Cabernet Sauvignon' and 'Nebbiolo' varieties. In a 'Cabernet Sauvignon' and 'Nebbiolo' vineyard in São Joaquim (SC), buds were collected from new shoots at the beginning of dormancy (May 2012) and at complete dormancy (August 2012) according to the following treatments: (T1) basal buds (1st to 5th), (T2) medial buds (6th to 10th) and (T3) apical buds (11th to 15th). Three shoots were collected from each plant, one located on the left side, one on the right side and the third in the center of the plant. Determination of the presence or absence of the beginning of inflorescence was performed only in the buds collected in complete dormancy, using a stereo microscope. The contents of total soluble carbohydrates, starch, total proteins, total organic carbon, total nitrogen and C/N ration were determined in buds at the beginning of dormancy and in complete dormancy. 'Cabernet Sauvignon' exhibited a greater number of fertile buds in the medial portion of the new shoots. But in the 'Nebbiolo' cultivar, the greatest number of fertile buds was observed in the medial and apical portions of the shoot. The greater carbon reserves in the 'Cabernet Sauvignon' buds may be responsible for the greate...

RESUMO Produção e atividade fotossintética de alface Mimosa Verde e Roxa em dois sistemas de cultivoA alface (Lactuca sativa L.) é a hortaliça folhosa mais consumida na alimentação do brasileiro, sendo boa fonte de vitaminas e de sais minerais. É largamente produzida no sistema convencional. No entanto, o cultivo hidropônico vem ganhando espaço no mercado, conquistando a confiança dos consumidores, cada vez mais exigentes com a qualidade dos alimentos. O objetivo deste trabalho foi avaliar o desempenho de duas cultivares de alface, nos sistemas de cultivo hidropônico e convencional, para a produção de massa fresca (MF) e massa seca (MS), fotossíntese, teores de Lettuce (Lactuca sativa L.) is the most commonly consumed leaf vegetable in the Brazilian diet, and it is a good source of vitamins and minerals. It is widely grown in the conventional farming system. However, the hydroponic farming system has been gaining importance in the market, wining confidence from consumers, who are becoming increasingly more demanding on food quality. The objective of this study was to evaluate the performance of two lettuce cultivars on hydroponic and conventional farming systems for the production of fresh mass (FM) and dry mass (DM), photosynthesis, contents of chlorophyll and anthocyanin. The following two experiments were carried out: hydroponics farming (HF) and conventional farming (CF), performed in protect and unprotect environments, respectively, in Florianópolis, SC. Mimosa Verde cultivar (MV) showed greater fresh mass than Mimosa Roxa (MR), in both farming systems and the two cultivars presented better performance in the hydroponic system (287.7 g MV and 139.1 g MR) than the conventional system (129.7 g MV and 111.8 g MR). Mimosa Verde cultivar presented lower average contents of total chlorophyll (7.7 mg g -¹ FM) than Mimosa Roxa (11.8 mg g -¹FM), and both cultivars displayed higher means for this variable in the hydroponic farming system. Mimosa Roxa presented higher contents of anthocyanin in the conventional system (88.24 mg g -¹ FM) than the ones in the hydroponic system (36.89 mg g -¹ FM). The best results for CO 2 net assimilation rate regarded to photosyntheticaly active photon flux density were found in the hydroponic system, for both lettuce cultivars. Variation in the contents of chlorophyll were also found. Those variations were higher in the protected system than in the hydroponic system and contents of anthocyanin were higher in the conventional system.

Seeking a less toxic alternative to budburst management than hydrogen cyanamide, doses of the mineral-organic product Erger® were tested in combination with calcium nitrate (Ca(NO3)2). The experiment was conducted in Santana do Livramento, southern Brazil, during the 2013/14 and 2014/15 growth cycles, in a ‘Merlot’ vineyard conducted in a vertical trellis system, pruned in double Guyot, with SO4 rootstock. Treatments were: Control (unsprayed); 5.0% Ca(NO3)2; 2.5% Erger® + 5.0% Ca(NO3)2; 5.0% Erger® + 5.0% Ca(NO3)2; 7.5% Erger® + 5.0% Ca(NO3)2; 3.5% Dormex® (positive control). All Erger® treatments stimulated budbreak, increasing budburst from 68% (unsprayed and calcium nitrate means) to 83% (Erger® means) in the first cycle and from 85% to 96% in the second one, with no difference among doses. Plants treated with Dormex® had budburst similar to Erger® in the first cycle (85%), but budburst in the second cycle was only 72%, possibly due to burned buds. Therefore, Erger®, in concentrations of 2.5% or more with 5% calcium nitrate, may be a promising alternative to induce budburst in regions with restrictions in cold availability.