RESUMOO presente trabalho teve por objetivo avaliar os teores de foliares de N, P, K, Ca e Mg em laranjeiras em função da aplicação de diferentes proporções de lodo de esgoto compostado em substituição à adubação nitrogenada mineral. Para o cálculo das doses aplicadas, considerou-se 2,77% de N presente no resíduo e taxa de mineralização de 30%, perfazendo as doses de 0, 6, 12, 18, 24 e 30 kg planta -1 de lodo de esgoto, complementado com fontes minerais a fim de satisfazer 100% da demanda nutricional. As plantas foram crescidas em vasos com 500 L de solo e irrigadas por gotejamento para reposição da água evapotranspirada no dia anterior. A aplicação de lodo de esgoto compostado ao solo na fertilização de laranjeiras 'Pêra' exerceram efeitos significativos nos teores foliares de N, P e Ca. Os tratamentos que utilizaram doses maiores que 18 kg lodo planta -1 causaram desbalanço nutricional entre Ca e Mg, com prejuízos à absorção de Mg, apresentando teores foliares inferiores aos considerados adequados. Palavras-chave:Citrus sinensis, nitrogênio, lodo de esgoto compostado. ROMEIRO, J. C. T; GRASSI FILHO, H.; MOREIRA, L. L.Q UPTAKE OF N, P, K, Ca AND Mg BY 'PEAR' ORANGE TREES FERTILIZED WITH COMPOSTED SEWAGE SLUDGE TO REPLACE MINERAL NITROGEN FERTILIZATION ABSTRACTThe objective of the study was to evaluate leaf levels of N, P, K, Ca and Mg in orange trees as a function of different levels of composted sewage sludge to replace mineral N fertilization. For dose calculation, 2.77% N in the residue and 30% mineralization rate were considered. Doses consisted of 0, 6, 12, 18, 24 and 30 kg plant -1 of sewage sludge which were supplemented with mineral sources to meet 100% nutritional demand. Plants were grown in 500 L soil pots and drip irrigated to replace evapotranspirated water from the day before. The use of composted sewage sludge in soil for fertilization of "Pear" orange trees had significant effects on leaf levels of N, P and Ca. Doses higher than 18 kg sludge plant -1 in the
The nutritional requirements of crops, in general, becomes more intense with the beginning of the reproductive phase, being more critical at the time of seed formation, when considerable amounts of nutrients are they translocation, this requirement should be increased to the fact that nutrients are essential to training and development of new bodies of booking. This study aimed to evaluate the agronomic efficiency of foliar application of zinc (zinc oxide Zn 700 g L-1 ) in bean plant, compared to leaf application of zinc sulphate (ZnSO4) and control (without application of Zn). The experiment was installed in the Faculty of Agricultural Sciences - UNESP / Campus de Botucatu-SP. Was placed in containers with a capacity of 20L of soil and leaf applications encompassing four schemes and two of rain, with 5 replicates per treatment, a total of 40 vessels. The results for the factorial design did not show in general, significantly different answers when evaluated on the simulation of rain or the lack of simulation. The treatment (700g L-1 of ZnO) has demonstrated agronomic efficiency as its foliar application, with results equal or exceed the application of ZnSO4 and control when applied at the same dose of Zn
Brazil is a major producer of bananas and knowing the fruit's production chain is essential to improve production efficiency. This study aimed to characterize the main actors and technical aspects of banana farming in the municipality of Botucatu, SP. The information was obtained by sampling in farmlands. In the municipality, cultivation takes place on small farms, with the family as the main responsible for production and management. Fertilizers and pesticides are obtained mainly outside the property. The crop occupies an average of 32% of the total area of the properties. There is no processing of the fruits. Irrigation (little used) and bagging of bunches (not used) are the most deficient cultural treatments. Average productivity is higher than the national average. The local market is the main destination for production. Production and revenue are regular or good throughout the year for more than half of the farmers.
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