RESUMO: A inadequada uniformidade de aplicação de água em sistemas de irrigação proporciona excesso da mesma em parte da área de cultivo e falta em outra, diminuindo a disponibilidade de água à cultura e aumentando o custo de produção. Este trabalho teve como objetivo avaliar a uniformidade em sistemas de irrigação por aspersão convencional, utilizados em olerícolas cultivadas na região do Alto Rio Pacuí, Montes Claros, MG. Os coeficientes de uniformidade (CUC, CUD, CUE, CUH, UDH), a eficiência de aplicação, as vazões e pressões dos sistemas foram obtidos de acordo com metodologia. Os resultados idetificaram que a maioria dos sistemas estão operando com uniformidades e eficiência de aplicação abaixo do recomendado. Vazamentos nas tubulações, dimensionamento inadequado dos sistemas, pressão e vazão fora dos padrões aceitáveis, são fatores que contribuiram com os valores obtidos nas avaliações.

Omissão de nutrientes em plantas de pinhão-manso cultivadas em solução nutritiva 1 O pinhão-manso (Jatropha curcas L.), pertecente à família Euphorbiaceae, é uma planta oleaginosa que tem recebido expressiva atenção para produção de biocombustível. O objetivo deste trabalho foi avaliar o efeito da deficiência de macro e micronutrientes no crescimento e estado nutricional de pinhão-manso, cultivado em solução nutritiva. O delineamento experimental utilizado foi o inteiramente casualizado, com treze tratamentos e três repetições. Os tratamentos constituíram-se de solução completa e omissão individual de cada um dos seguintes nutrientes: N, P, K, Ca, Mg, S, B, Cu, Mn, Mo, Zn ou Fe. A ordem decrescente de restrição da produção de massa de matéria seca foi N>Mg>S>K>Ca=P>Zn>B=Fe. As omissões de N e de P foram as que mais afetaram os teores dos macronutrientes da parte aérea das plantas e os sintomas de deficiências observados foram clorose, redução do crescimento e folhas deformadas. Palavras Effects of nutrient omission on growth and chemical composition of physic nutin hydroponics cultivationJatropha curcas L. belongs to the Euphorbiaceae family. It is an oleaginousplant and it has received much attention because of the production of biofuels. The objective of this study was to evaluate the nutritional status of Jatropha curcas under deficiency of macro and micronutrients in nutrient solution. The experimental design was completely randomized with thirteen treatments and three replications.The treatments consisted of a complete solution and individual omission of each of the following nutrients: N, P, K, Ca, Mg, S, B, Cu, Mn, Mo, Zn or Fe. The decreasing orderofproductionrestriction ofdry matterwasN>Mg>S>K>Ca=P>Zn>B=Fe. Omissions of N and P affected mots the contents of macronutrients in the shoots of physic nut and the deficiency symptoms observed were chlorosis, reduced growth and deformed leaves.

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ResumoO tomate cereja (Solanum lycopersicum) é altamente exigente em relação aos nutrientes minerais. O uso do esterco animal mostra-se uma forma eficiente e sustentável de adubação para essa cultura. O objetivo deste trabalho foi avaliar o efeito de diferentes doses de esterco bovino no crescimento vegetativo e reprodutivo do tomate cereja. O experimento foi conduzido em casa de vegetação do Departamento de Fitotecnia da Universidade Federal de Viçosa, sendo utilizando delineamento experimental inteiramente casualizado, com cinco tratamentos e quatro repetições, além de um tratamento controle utilizando fertilizante químico como fonte de NPK. Após 45 dias do início do experimento foram avaliados o número de folhas, de flores e de frutos, a massa seca de folhas, caule, flores, frutos e raízes, o comprimento do caule e o volume radicular. Foi avaliado, também, o teor de nutrientes em folhas, caule e raízes. As plantas cultivadas com fertilizante químico obtiveram menor média em todas as variáveis fitotécnicas analisadas. O número de folhas e frutos e a produção de matéria seca de folhas, frutos e caule apresentaram resposta linear crescente com o aumento das doses de esterco. Os teores foliares de Ca, Mg e S foram maiores no tratamento com adubação química. Palavras-chave: Crescimento; Produção de frutos; Solanum lycopersicum AbstractOrganic fertilization in cherry tomato plants. Cherry tomato (Solanum lycopersicum) is highly demanding with regard to mineral nutrients. The use of animal manure shows to be an efficient and sustainable fertilization way for this crop. This study aimed to evaluate the effect of different doses of cattle manure in the vegetative and reproductive growth of cherry tomato. The experiment was conducted in a greenhouse at the Plant Science Department of Universidade Federal de Vicosa, using a completely randomized experimental design with 5 treatments and 4 replications, besides 1 control treatment using chemical fertilizer as a source of NPK. After 45 days from the beginning of the experiment, the number of leaves, flowers, and fruits, the dry mass of leaves, stem, flowers, fruits, and roots, the stem length, and the root volume were evaluated. The nutrient content in leaves, stem, and roots was also evaluated. Plants grown with chemical fertilizer obtained a lower average for all phytotechnical variables analyzed. The number of leaves and fruits, and the production of dry matter of Biotemas, 26 (1): 37-44, março de 2013

Tomato is one of the most popular vegetables, with high nutrient demand. The nutrient concentration can vary depending on the development phase, cultivation system, temperature, soil conditions, luminosity, relative humidity and management practices. The aim of this work was to characterize cherry tomato visual symptoms of deficiency, as well as the effect of nutritional restriction on the development and nutrient concentration of plants cultivated in nutrient solution. Plants of the cherry tomato, cultivar Sindy, were grown in green house. We have used eleven treatments, one control with complete nutrient solution and the other ten omitting respectively the nutrients nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, copper, zinc and iron. The experiment was performed in randomized design with three repetitions. After 60 days, the plants were removed from the solutions and their main symptoms were photographed and described. The traits evaluated were: total dry matter yield, dry matter of leaves, dry matter of stems and dry matter of roots; number of leaves, number of inflorescences; number of fruits and root volume. The concentration and accumulation of nutrients: nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, copper, zinc and iron in leaves, stems and roots were evaluated. Nutrient concentration and accumulation were influenced by the deficiencies imposed. The visual symptoms of deficiency that had appeared firstly were those of phosphorus, boron and iron, respectively. The omissions of the nutrients nitrogen, magnesium and boron were the ones that most compromised the dry matter production of the cherry tomato plants.

RESUMO:Objetivou-se com esse trabalho avaliar a interferência de possíveis efeitos alelopáticos de Mentha x villosa Huds. sobre a emergência de Lactuca sativa L. As atividades foram conduzidas em laboratório, no Instituto de Ciências Agrárias (ICA) da Universidade Federal de Minas Gerais, em Montes Claros/MG. Foram propostos três tratamentos, sendo esses: solo A, coletado em área cultivada com hortelã no horto medicinal do ICA/UFMG; solo B, coletado em áreas adjacentes e, testemunha (papel germiteste).O delineamento experimental foi inteiramente casualizado (DIC), com sete repetições. As variáveis avaliadas foram: porcentagem e índice de velocidade de emergência. Observou-se que a emergência de plântulas de Lactuca sativa foi significativamente afetada pelo solo A (6,95%) se comparada com o solo B (21,71%), representando assim, uma inibição da emergência, ou seja, efeito alelopático da hortelã sobre a emergência de alface. Já o índice de velocidade de emergência (IVE) não diferiu significativamente entre os solos testados. Palavra-chave: alelopatia, germinação, plantas medicinaisABSTRACT: Allelopathic influence of mint (Mentha x villosa Huds.) on the emergence of lettuce (Lactuca sativa L.) seedlings. This study aimed to assess the interference of possible allelopathic effects of Mentha x villosa Huds. on the germination of Lactuca sativa L. The activities were carried out in laboratory, at the Institute of Agricultural Sciences (ICA) of the Federal University of Minas Gerais, Montes Claros, Minas Gerais State, Brazil. The following three treatments were proposed: soil A, collected in area cultivated with mint at the garden of ICA; soil B, collected in adjacent areas; and control (germitest paper). Experimental design was completely randomized (CR), with seven replicates. The evaluated variables were: germination percentage and speed index. The emergence of Lactuca sativa seedlings was significantly affected by soil A (6.95%) when compared to soil B (21.71%), indicating thus emergence inhibition, i.e. an allelopathic effect of mint on lettuce emergence. On the other hand, the germination speed index (GSI) did not differ significantly between the tested soils.

Recebido para publicação em 12/02/2008 Aceito para publicação em 30/11/2008 Influência do cultivo em consórcio na produção de fitomassa e óleo essencial de manjericão (Ocimum basilicum L.) e hortelã (Mentha x villosa Huds.) MAIA Palavras-chave: plantas medicinais, metabólitos secundários, consórcioABSTRACT: Influence of intercropping on phytomass and essential oil production in basil (Ocimum basilicum L.) and mint (Mentha x villosa Huds.). Medicinal plants produce their active principles according to environmental stimuli; thus, the presence of other plants may affect the synthesis of secondary compounds. The present work aimed to evaluate the effect of intercropping on phytomass and essential oil production in basil (Ocimum basilicum L.) and mint (Mentha x villosa Huds.). The study was carried out in the experimental field of the Center for Agriculture, Federal University of Minas Gerais, Montes Claros Campus, Minas Gerais State, Brazil. The experimental design was in randomized blocks, with twelve replicates and six treatments: basil + carrot, basil + lettuce, sole crop of basil, mint + carrot, mint + lettuce, and sole crop of mint. Phytomass and essential oil production in mint were not affected by the treatments. As regards basil, only fresh matter significantly varied with treatments.

Boron is one of the micronutrients that mostly limits crop yield in Brazil, especially for tomato. When boron is deficient, there is initially growth reduction in meristematic tissues (root ends and branches), although for tomato, this behavior has not yet been characterized. The aim of this work was to characterize the effects of boron deficiency on biometric characteristics, anatomical changes and deficiency symptoms in cherry tomato plants. For this, cherry tomato plants of cultivar Sindy were cultivated in nutrient solution and submitted to two treatments: (1) complete nutrient solution; and (2) nutrient solution without boron. Sixty days after seedling transplanting, phytotechnical and anatomical characteristics of leaves, stems and roots were evaluated. Drastic anatomical changes were observed in plants deficient in boron, both in leaves and stems. Disorganized vascular bundle, as well as xylem and phloem, with atypical cellular composition was observed. The root development was also affected by boron deficiency showing elongation restriction and apical meristematic necrosis, which compromised the long distance transport in the plant. This affected mainly the inflorescence formation and consequently reduce the fruit production.